229 results on '"Nikel"'
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52. RESEARCH INTO COMPLEX FORMATION OF COBALT(II) AND NICKEL (II) WITH 2-HYDROXY-5-NITROTHIOPHENOL AND DIPHENYLGUANIDINE.
- Author
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Aliyev, S. G., Ismailova, R. A., Ibrahimova, Sh. A., Asgerova, Z. G., and Zalov, A. Z.
- Subjects
- *
COBALT , *NICKEL , *DIPHENYLGUANIDINE , *BIPHENYL compounds , *CHEMICAL reactions - Abstract
The interaction of cobalt (II) and nickel (II) with 2-hydroxy-5-nitrothiophenol (HNTPh) and diphenylguanidine (DPG) produces chloroform-extracted mixed-ligand complexes (MLC) with the ratio Me (II): GNTF: DPG = 1: 2: 2. Conditions for extraction-photometric determination of cobalt (II) nickel (II) are revealed. It found that MLC are formed in a weakly acid medium (pHopt = 4.4 ÷ 7.8). Note that all studies were performed with CHCl3 (extraction ratio R = 98.3-98.6%). To generate and extract MLC, (1.2-2.0) × 10-3 M HNTPh and (2.0-2.5) × 10-3 M DPG are required. Maximum in the absorption spectrum for cobalt (II) nickel (II) MLC is observed at 560 nm and 480 nm, respectively. The following chemical analytical parameters were calculated: extraction constants (Kex = 10.56-11.64), stability constants (β = 8.59-9.62), distribution constants (KD = 1.86-1.92), coefficients extraction (R = 98.3-98.6%) with molar coefficient of light absorption being equal to (2.64 - 3.30) × 104. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
53. Metanın kuru reformlanma reaksiyonunda indirgeme ve reaksiyon sıcaklıklarının mezogözenekli alümina destekli nikel katalizörlerin aktivitelerine ve karbon oluşumuna etkileri.
- Author
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Arbağ, Hüseyin, Yaşyerli, Sena, Yaşyerli, Nail, Doğu, Gülşen, and Doğu, Timur
- Abstract
In this study effect of one of preparation steps, reduction temperature, and reaction temperature on activity of catalyst and coke formation were investigated. Mesoporous alumina materials were prepared by following a sol-gel method. The catalysts with different nickel amount (16 wt% and 8 wt%) were synthesized via onepot and impregnation methods and reduced at different reduction temperatures (550®C and 750®C). Dry reforming of methane reaction was performed at 600®C and 750®C in a packed bed reactor system. It was observed that increase in the reduction temperature led nickel in the structure of the catalyst to form metallic Ni and increased the crystal size of Ni through sintering and changed the fractional methane conversion and selectivity of hydrogen. At high reaction temperature occurrence of reverse water gas shift and coke formation reactions as side reactions of dry reforming of methane could be reduced. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
54. Quantitative Analysis of Lead and Nickel in Benign Meningioma and Glioblastoma Multiforme.
- Author
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Adilay, Utku, Gunal, Murat, Tanriverdi, Osman, Guler, Ali Kemal, Güçlü, Bulent, and Demirgil, Bulent
- Subjects
- *
MENINGIOMA , *GLIOMAS , *LEAD , *NICKEL , *SPECTROPHOTOMETRY , *TISSUES , *TRACE elements , *MICROBIAL virulence , *DIAGNOSIS - Abstract
Objective: The aim of this study was to compare lead (Pb) and nickel (Ni) levels in tissue samples of benign meningiomas and glioblastoma multiformes. Material and Methods: This study was performed in pathologically diagnosed benign meningioma and glioblastoma multiforme specimens (20 specimens in each group and a total of 40 specimens) obtained from operations. Measurements of trace elements were performed with Shimadzu AA 680 atomic absorption spectrophotometer. p<0.05 was considered as statistically significant. Results: The level of lead in benign meningioma specimens was similar to that in glioblastoma multiforme specimens (p=0.817). The level of nickel in benign meningioma specimens were statistically higher than that in glioblastoma multiforme specimens (p=0.003). Conclusion: The high Nickel content of benign meningiomas compared to that of glioblastoma multiformes and the possible correlation of nickel with meningioma formation should be further evaluated. We consider that our findings carry valuable data for new researches and can contribute to worthwhile information on pathogenesis of meningioma and glioblastoma multiforme. [ABSTRACT FROM AUTHOR]
- Published
- 2017
- Full Text
- View/download PDF
55. Hydrogen production and process optimization using thin film nickel catalyst in KBH4 hydrolysis
- Author
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Meryem Sena AKKUŞ
- Subjects
Engineering, Chemical ,Potassium borohydride ,Hydrolysis ,Hydrogen production ,Nickel ,Magnetron sputtering ,Potasyum borhidrür ,Hidroliz ,Hidrojen üretimi ,Nikel ,Magnetron sputter ,Pharmacology (medical) ,Mühendislik, Kimya - Abstract
In this study, nickel was coated as a thin film on the slide by magnetron sputtering and used as a catalyst for alkali potassium borohydride hydrolysis. The effects of parameters such as ambient temperature, catalyst amount, wt% KBH4 ratio, volume of HCl and wt% NaOH ratio rate on the hydrogen production rate in the catalytic hydrolysis of potassium borohydride solution were investigated in detail by response surface method. Process optimization was done using central composite design and the efficiency of the parameters was determined by analysis of variance. As a result of the model created, the optimum parameters for the maximum HGR value; ambient temperature 55 ˚C; 13% KBH4; 0.6% NaOH; Determined as 9 mL of 0.5 M HCl. The maximum hydrogen generation rate was calculated as 92.8 L/min g., Bu çalışmada nikel, magnetron saçtırma işlemi ile lam üzerine ince bir film olarak kaplanmış ve alkali potasyum borhidrür hidrolizinde katalizör olarak kullanılmıştır. Ayrıca ortam sıcaklığı, katalizör miktarı, % KBH4 oranı, HCl hacmi ve % NaOH oranı gibi parametrelerin potasyum borhidrür çözeltisinin katalitik hidrolizinde hidrojen üretimi hızına olan etkileri de yanıt yüzey metodu ile ayrıntılı olarak incelenmiştir. Proses optimizasyonu merkezi kompozit dizaynı kullanılarak yapılmış ve parametrelerin etkinliği varyans analizi ile belirlenmiştir. Oluşturulan model sonucunda, maksimum HGR değeri için optimum parametreler; ortam sıcaklığı 55 ˚C; %13 oranında KBH4; %0.6 oranında NaOH; 9 mL 0.5 M HCI olarak belirlenmiştir. Maksimum hidrojen üretim hızı 92.8 L/dk. g olarak hesaplanmıştır.
- Published
- 2022
56. Pengembangan Baja Paduan Tahan Peluru Melalui Proses Hot-Forging Terhadap Morfologi Dan Sifat Mekanik
- Author
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Putra, Ilham Nugrahatama
- Subjects
nickel ,nikel ,Lateritic steels ,microstructure ,sifat mekanik ,Baja laterit ,mechanical properties ,struktur mikro ,armour material ,material armor - Abstract
Laterite steel is steel that has a nickel content of up to 2%. The nickel content can produce steel with superior properties such as: high strength, corrosion resistance, and good weldability properties. With the superior nature of laterite steel is needed in the main tool of the indonesian national tantara weapon system. To find out the performance of damage to bulletproof materials, then conducted research on this laterite steel as a tough armour material by conducting research in the form of mechanical properties testing (Hardness, and Impact) and microstructures (Metalography). Samples are prepared in accordance with ASTM standardization. Based on the results of the hardness test, the average values of F and T samples were 663.9 HVN and 170.7 HVN. Material F qualifies as a ballistic resistant material (armour) because the hardness obtained in accordance with the classification and can withstand bullet penetration well. Then the impact test obtained the average value of the F and T samples is 9 joules and 148 joules. For F samples, the type of fault is a granular fracture and a T sample of the type of fault is a tenacious fracture. As a result of metallographics, sample F has a corrected phase is upper bainite as a matrix and martensite is generally shaped like a fine needle. Then the T sample has a formed phase is dominated by ferrite with soft and tenacious properties. As well as perlite as a matrix with quite hard and strong properties., Baja laterit adalah baja yang memiliki kandungan nikel hingga 2%. Kandungan nikel tersebut dapat menghasilkan baja dengan sifat unggul seperti: kekuatan tinggi, ketahanan korosi, dan sifat mampu las yang baik. Dengan sifat unggulnya baja laterit dibutuhkan dalam alat utama sistem senjata tantara nasional indonesia. Untuk mengetahui performa kerusakan material tahan peluru, Maka dilakukanlah penelitian terhadap baja laterit ini sebagai material armour yang tangguh dengan dilakukanlah penelitian berupa pengujian sifat mekanik (Uji Kekerasan, dan uji Impak) dan struktur mikro (Metalografi). Sampel dilakukan preparasi sesuai dengan standarisasi ASTM. Berdasarkan hasil uji kekerasan didapatkan nilai rata-rata sampel F dan T adalah 663.9 HVN dan 170.7 HVN. Material F memenuhi syarat dijadikannya material tahan balistik (armour) dikarenakan kekerasan yang didapat sesuai dengan klasifikasi dan dapat menahan penetrasi peluru dengan baik. Kemudian uji impak didapatkan nilai rata-rata sampel F dan T adalah 9 joule dan 148 joule. Untuk sampel F jenis patahannya yaitu patah getas berbentuk granular dan sampel T jenis patahannya yaitu patah ulet. Hasil metalografi, sampel F memiliki fasa yang terbetuk adalah upper bainite sebagai matriks dan martensite umumnya yang berbentuk seperti jarum halus. Kemudian sampel T memiliki fasa yang terbentuk adalah didominasi oleh ferrite dengan sifat yang lunak dan ulet. Serta perlite sebagai matriks dengan sifat cukup keras dan kuat.
- Published
- 2022
57. Endüstriyel Anaerobik Reaktörler İçin Enerji Dönüşümünün Hızlandırılmasına Yönelik Bir Çalışma
- Author
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KARA, Ayhan and ŞENOL, Halil
- Subjects
Biyogaz ,endüstriyel reaktörler ,iz elementler ,Nikel ,Kobalt ,Fizik, Uygulamalı ,Biogas ,industrial reactors ,trace elements ,Nickel ,Cobalt ,Physics, Applied - Abstract
Biogas energy, one of the renewable energy sources, has become a newly developing sector in Turkey. The existing biogas reactors in Turkey are generally continuous type reactors and use cattle manure (CM) as a substrate. According to the researches, the biogas yield of SG is considerably lower than the literature yields (50-100 ml/g volatile solids (VSSG)). Therefore, a study was conducted to increase the yield of CM. In this context, the biogas yield of CM was tested in a laboratory-scale 5L reactor at the operating temperature (35 °C) most commonly used by industrial reactors. After this reactor was determined as a control reactor, the reactor residue, which was free from soluble carbohydrates, proteins and oils and mostly containing lignocellulosic, was obtained. To this residue, 4% w/w NaOH pretreatment and trace metals nickel (Ni) and cobalt (Co) were added at different concentrations (50, 100 and 150 µg/total solids CM). In this way, compared to the control reactor, a result (36 - 47%) that can stimulate hydrogenotrophic activity and further increase biogas production as a result of the addition of these metals at certain concentrations was encountered. As a results of highest biogas yield of CM for the best Ni and Co concentrations was 509.5 ± 19.9 mL/g volatile solids., Yenilenebilir enerji kaynaklarından biri olan biyogaz enerjisi Türkiye’de yeni gelişmekte olan bir sektör haline gelmiştir. Türkiye’de mevcut biyogaz reaktörleri genellikle sürekli tip reaktörler olup substrat olarak sığır gübresi (SG) kullanmaktadır. Yapılan araştırmalara göre SG’nin biyogaz verimi literatürdeki verimlerinden oldukça düşük değerde (50-100 ml/g uçucu katı (UKSG)) çıkmaktadır. Bu nedenle SG’nin verimini artırmaya yönelik olan bu çalışma yapılmıştır. Bu bağlamda SG’nin biyogaz verimi laboratuvar ölçekli 5L’lik bir reaktörde endüstriyel reaktörlerin en çok kullandığı çalışma sıcaklığında (35 °C) test edilmiştir. Bu reaktör kontrol reaktörü olarak belirlendikten sonra çözünür karbonhidrat, protein ve yağlardan arınmış ve çoğunlukla lignoselülozik içeren reaktör kalıntısına %4 m/m NaOH ön işlemi ve sonrasında katalitik metallerden olan nikel (Ni) ve kobalt (Co) farklı konsantrasyonlarda (50, 100 ve 150 µg/toplam katı SG) eklenmiştir. Bu sayede kontrol reaktörüne kıyasla, bu metallerin belirli konsantrasyonun eklenmesi ile hidrojenotrofik aktiviteyi uyarabilen ve biyogaz üretimini daha da artırabilen bir sonuçla (%36 - 47) karşılaşılmıştır. En iyi Ni ve Co konsantrasyonu için SG’nin en yüksek biyogaz verimi toplam 509,5 ± 19,9 ml/g UK olmuştur.
- Published
- 2022
58. Katı Faz Ekstraksiyonu ile Bakır ve Nikelin Önderiştirilmesinde ONNO ve ONO Tipi Schiff Bazlarının Karşılaştırılması
- Author
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Fadime Dinçer Kaya, Orhan Atakol, and Selda Doğan
- Subjects
Schiff base ,solid phase extraction ,copper ,nickel ,preconcentration ,Schiff bazı ,katı faz ekstraksiyonu ,bakır ,nikel ,önderiştirme ,Science (General) ,Q1-390 - Abstract
Özet: Çalışmada, ONO tipi, üç dişli (N-(2'-hidroksifenil)-2-hidroksi-1-naftaldimin) ve ONNO tipi, dört dişli (Bis-N,N'-(2-hidroksi-1-naftiliden)-1,3-propandiamin) Schiff bazları silika jel üzerine adsorbe edilerek katı faz ekstraksiyonunda kullanılmak üzere iki adsorban materyali hazırlandı ve bu adsorban materyalleri Cu2+ ve Ni2+ iyonlarının önderiştirilmesi için incelendi. Her bir iyon için pH, akış hızı, elüent tipi ve girişim yapan türlerin etkileri incelendi. Cu2+ ve Ni2+ derişimleri alevli atomik absorpsiyon spetroskopisi ile tayin edildi. Çalışma en uygun pH'ın seçilmesi için pH 2-9 arasında gerçekleştirildi. Geri kazanma oranları ONNO tipi Schiff bazı için, 5 'den daha büyük pH'larda % 90'ın üzerinde bulundu. ONO tipi Schiff bazında ise bu oranın bu oranın % 90'ın altında kaldığı görüldü. Cu2+ için gözlenebilme sınırı 0,008 µg/mL, alt tayin sınırı 0,024 µg/mL, Ni2+ için gözlenebilme sınırı 0,016 µg/mL, alt tayin sınırı 0,048 µg/mL olarak bulundu. Yöntemin doğruluğu CRM BCR-397 insan saçı ve NIST 2976 midye dokusu sertifikalı referans standart maddeleri ile kontrol edildi. Anahtar kelimeler: Schiff bazı, katı faz ekstraksiyonu, bakır, nikel, önderiştirme Abstract: In this study, Schiff bases of ONO type, tridentate, N-(2-hydroxyphenyl)-2-hydroxy-1-naphthaldymine and ONNO type, tetradentate, Bis-N,N'-(2-hydroxy-1 – naphthaldymine)-1,3- propandiamin were adsorbed on to silica gel to form two adsorbtion materials that used for solid phase extraction. These adsorption materials were investigated for enrichment of Cu2+ and Ni2+ ions. pH, eluent type, flow rate and the effects of foreign ions were examined for every ions. The concentrations of Ni2+ and Cu2+ ions were determined with flame atomic absorption spectroscopy. The study was carried out between pH 2 and 9 in order to select an optimum pH value. The regain value in the pre concentration process was observed to reach above 90% after pH value of 5 for ONNO type ligand. The regain value of ONO type ligand was below 90%. LOD and LOQ was calculated as 0,008 µg/mL and 0,024 µg/mL for Cu2+ respectively. Also LOD and LOQ was calculated as 0,016 µg/mL and 0,048 µg/mL for Ni2+. The accuracy of the method was tested by certificated reference standard materials, CRM BCR-397 human hair and NIST 2976 mussel tissue. Key words: Schiff base, solid phase extraction, copper, nickel, preconcentration
- Published
- 2014
59. Erken Evre Maden Sahalarında Yeni Jeofizik Arama Yaklaşımları.
- Author
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Kallfa, Genc, Kapllani, Ludvig, and Köksal, Mert
- Subjects
GEOLOGICAL research ,DRILLING & boring ,BROWNFIELDS ,GEOPHYSICAL prospecting ,GEOPHYSICS - Abstract
Copyright of Abstract of the Geological Congress of Turkey / Türkiye Jeoloji Kurultayı Bildiri Özleri is the property of TMMOB JEOLOJI MUHENDISLERI ODASI and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2023
60. Determination of nickel in crude oil using voltammetry method
- Author
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Yıldız, Mesut Bilal, Levent, Abdulkadir, and Batman Üniversitesi Lisansüstü Eğitim Enstitüsü Kimya Anabilim Dalı
- Subjects
Ağır Metal ,Heavy Metal ,Square Wave Voltammetry ,BDD Elektrot ,Nikel ,Nickel ,Ham Petrol ,BDD Electrode ,Kare Dalga Voltametri ,Crude Oil - Abstract
Bu tez çalışması Batman Üniversitesi Bilimsel Araştırma Projeleri Başkanlığı tarafından BTÜBAP-2021-YL-015 no’lu proje ile desteklenmiştir., Bu tez çalışmasında ham petrol içinde ağır metal olarak en fazla yoğunluğa sahip metallerden olan nikelin, elektroanalitik yöntemlerden biri olan voltametri yöntemi kullanarak tayini çalışması yapılmıştır. Nikel 0.5 M H2SO4 ortamında -3.0 V’ta katodik yönde aktive edilen bor katkılı elmas elektrot yüzeyinde Britton-Robinson (pH = 3.0) ortamında -0.15 V civarında çok duyarlı bir yanıt vermiştir. Geliştirilen kare dalga voltametrik yöntemi BR (pH 3.0) ortamında 0.05-0.6 μM derişim aralığında doğrusal olduğu ve gözlenebilirlik sınırı ve en düşük tayin sınırı sırasıyla 0.003 μM ve 0.01 μM olarak saptanmıştır. Önerilen yöntem ham petrol numunesine başarılı bir şekilde uygulanmıştır., In this thesis, the determination of nickel, which is one of the metals with the highest density as a heavy metal in crude oil, was carried out using voltammetry method, which is one of the electroanalytical methods. Nickel gave a very sensitive response around -0.15 V in Britton-Robinson (pH = 3.0) environment on the boron-doped diamond electrode surface activated cathodically at -3.0 V in 0.5 M H2SO4 environment. The developed square wave voltammetric method was found to be linear in the concentration range of 0.05-0.6 μM in BR (pH 3.0) medium, and the observability limit and the lowest detection limit were found to be 0.003 μM and 0.01 μM, respectively. The proposed method has been successfully applied to the crude oil sample.
- Published
- 2022
61. OPTIMIZATION OF NICKEL EXTRACTION FROM LATERITIC ORE IN HYDROCHLORIC ACID SOLUTION WITH HYDROGEN PEROXIDE BY TAGUCHI METHOD.
- Author
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ARAS, Ali and AĞAÇAYAK, Tevfik
- Subjects
HYDROGEN peroxide ,NICKEL ,TAGUCHI methods - Abstract
Copyright of Selcuk University Journal of Engineering, Science & Technology / Selçuk Üniversitesi Mühendislik, Bilim ve Teknoloji Dergisi is the property of Selcuk University, Engineering & Architecture Faculty and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2017
- Full Text
- View/download PDF
62. DISSOLUTION KINETICS OF NICKEL FROM GÖRDES (MANİSA-TURKEY) LATERITIC ORE BY SULPHURIC ACID LEACHING UNDER EFFECT OF SODIUM FLUORIDE.
- Author
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AĞAÇAYAK, Tevfik and ARAS, Ali
- Subjects
NICKEL ,SULFURIC acid ,SODIUM fluoride - Abstract
Copyright of Selcuk University Journal of Engineering, Science & Technology / Selçuk Üniversitesi Mühendislik, Bilim ve Teknoloji Dergisi is the property of Selcuk University, Engineering & Architecture Faculty and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2017
- Full Text
- View/download PDF
63. Molecular modulations and influence of acclimation of Ni on acute Ni toxicity in Plectonema boryanum.
- Author
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Farooqui, Alvina, Mahfooz, Sadaf, Shamim, Adeeba, Siddiqui, Haris Mohd., and Kumar Kesari, Kavindra
- Subjects
- *
PHENOL , *PROLINE , *ACCLIMATIZATION , *NICKEL , *PLECTONEMA boryanum , *OXIDATIVE stress - Abstract
The article discusses a study which which examined the results of accumulation of phenol and proline during the acclimation process. Topics covered include the influence of acclimation of nickel on acute nickel toxicity in Plectonema boryanum, and findings which suggest the possible mechanism between metal toxicity and oxidative stress.
- Published
- 2016
- Full Text
- View/download PDF
64. KARAKTERISTIK ARANG AKTIF TANDAN KOSONG KELAPA SAWIT YANG DIMPREGNASI LOGAM NIKEL SEBAGAI KATALIS
- Author
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Ani Suryani, Gustan Pari, Rina Novia Yanti, and Erliza Hambali
- Subjects
arang aktif ,nikel ,tandan kosong kelapa sawit ,General Earth and Planetary Sciences ,katalis ,Forestry ,SD1-669.5 - Abstract
Arang aktif yang berasal dari biomassa dapat dimanfaatkan untuk berbagai aplikasi, karena memiliki porositas yang tinggi. Salah satu pemanfaatan arang aktif adalah sebagai bahan baku katalis. Arang aktif dalam penelitian ini berasal dari tandan kosong kelapa sawit (TKKS ). Tujuan penelitian ini adalah untuk menentukan karakteristik arang aktif yang dimpregnasi logam Nikel (Ni) sebagai bahan baku katalis dalam proses upgrading bio oil. Aktivasi arang TKKS menggunakan larutan asam fosfat (H 3 PO 4 ) dengan konsentrasi 10%, 15% dan 20% yang direndam selama 24 jam, dilanjutkan dengan kalsinasi pada suhu 750°C dan steam uap selama 60 menit. Aktivasi terbaik dari arang aktif menggunakan asam fosfat 10%, selanjutnya diimpregnasi logam nikel dengan konsentrasi 1%, 2%, 3%. Hasil karakteristik arang aktif impregnasi logam nikel adalah daya serap iodin554-756 mg/g, daya serap metilen biru 38-90 mg/g dan luas permukaan 96-218 m 2 /g dengan diameter pori 8,48-16,21 µ.
- Published
- 2020
65. Investigation of the effect of mechanical activation on nickel recovery from electrolytic nickel coating waste
- Author
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Korkut, Azize İrem, Apaydın, Fatih, and Korkut, Azize İrem
- Subjects
Nikel ,Liç ,Atık Çamur ,Leaching ,Mekanik Aktivasyon ,Sludge ,Mechanical Activation - Abstract
Günümüzde nikel sahip olduğu yüksek ergime sıcaklığı, yüksek korozyon direnci, indirgeme katalizörü olarak kullanılabilmesi ve kolay alaşım yapması gibi teknolojik özelliklerinden dolayı kullanımı gittikçe artan bir element haline gelmiştir. Nikel yaygın olarak lateritik nikel cevherleri ve sülfürlü nikel kaynakları olmak üzere başlıca iki tip cevherden elde edilmektedir. Diğer tüm metallerde olduğu gibi hurda ya da atıklardan geri kazanım nikel için de önemli bir alternatif kaynak olmuştur. Nikelin fazlaca tüketildiği alan korozyondan korunma amaçlı yapılan uygulamalardır. Bu uygulamaların en önemlisi de nikel kaplamadır. Elektrolitik nikel kaplama banyo atık çamurlarında ciddi oranda nikel bulunmaktadır. Bu tez çalışmasında Bilecik’te kurulu Durden Plastik A.Ş. firmasından elde edilen atık çamurundan nikelin geri kazanımına mekanik aktivasyonun etkisi incelenmiştir. Deneysel çalışmanın ilk aşamasında nikel atık çamuru kimyasal bileşimi ve faz yapısı açısından incelenmiş atık çamurunun %28 Ni içerdiği tespit edilmiştir. Mekanik aktivasyon çalışmalarında optimum mekanik aktivasyon süresi 90 dk olarak belirlenmiştir. Mekanik aktive olmamış ve 90 dk mekanik aktive olmuş nikel atık çamurunun sülfürik asitle liç parametreleri kıyaslanmıştır. 90 dk mekanik aktive olmuş nikel atık çamurunda en iyi şartlarda %96 çözünme verimi gerçekleşirken bu oran mekanik aktive olmamış nikel atık çamurunda en fazla %89’a çıkabilmiştir. Today, nickel has become an increasingly used element due to its technological properties such as its high melting temperature, high corrosion resistance, use as a reduction catalyst and easy alloying. Nickel is commonly obtained from two main types of ores: lateritic nickel ores and sulfide nickel sources. As with all other metals, recovery from scrap or waste has been an important alternative source for nickel. The areas where nickel is consumed excessively are applications made for corrosion protection. The most important of these applications is nickel plating. There is a significant amount of nickel in electrolytic nickel-plated bath waste sludge. In this thesis study, the effect of mechanical activation on the recovery of nickel from the waste sludge obtained from the Durden Plastik A.Ş. was investigated. In the first stage of the experimental study, nickel waste sludge was examined in terms of chemical composition and phase structure, and it was determined that the waste sludge contained 28% Ni. In mechanical activation studies, the optimum mechanical activation time was determined as 90 minutes. The leaching parameters of the mechanically nonactivated and 90 minutes mechanically activated nickel waste sludge with sulfuric acid were compared. In the best conditions, 96% dissolution efficiency was achieved in the 90 min mechanically activated nickel waste sludge, while this rate could reach up to 89% in the mechanically nonactivated nickel waste sludge
- Published
- 2022
66. MIS KUPOROSI SEXI CHIQINDI OQOVA SUVLARIDAN METALLARNI CHO’KTIRUVCHI REAGENTLAR YORDAMIDA AJRATISH
- Author
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Xoliqulov D.B., Ibotov B.O., Maxmudova F.M., and Ostonov Sh.Q.
- Subjects
precipitating agent ,ammonium thiocyanate ,mis kuporos ,hydrometallurgy ,copper sulfate ,осаждающий реагент ,mis sulfati ,elektrolit ,никель ,nickel ,spektral analiz ,ammo-niy rodanid ,гидрометаллургия ,селективность ,gidrometallurgiya ,cho’ktiruvchi reagent ,electrolyte spectral analysis ,nikel ,электролит ,сульфат меди ,роданид аммония ,selectivity ,process solution ,tanlovchanlik ,технологический раствор ,texnologik eritma ,медный купорос ,спектральный анализ - Abstract
Bugungi kunda texnika va texnologiyalarning yuqori darajada rivojlanishi metallar isteʼmoliga boʼlgan talabni ortishiga olib kelmoqda. Ogʼir rangli metallarni ishlab chiqarishning uzluksiz oʼsishi texnogen chiqindilarni isteʼmolini koʼpayishiga olib keldi, bu nafaqat metallarni qoʼshimcha ishlab chiqarish manbai, balki tayyor mahsulot tannarxini pasaytirish omili sifatida ham koʼrilmoqda. Yaqin yillarda "Olmaliq KMK" АJ mis ishlab chiqarish hajmini 1,5-2 baravar oshirishni rejalashtirmoqda, buning natijasida texnogen chiqindilar (shlaklar, gazlar,chang, shlam, yuvish eritmalari, chiqindi suv va boshqalar)ning miqdorini xam ortishiga olib keladi, ularni qayta ishlash esa maxsus yondashuvni talab qiladi. . Metallarni erigan holda bo’lishi ularni ajratib olishni bir muncha osonlashtiradi. Chunki, bizga ma’lumki metallurgiya sanoatida asosiy sarf xarajatlar qayta ishlashga tayyorlash jarayonlariga sarflanadi. Mis kuporos sexi oqova suvlaridan metallarni ajratishda Navoiazot 201-sex (tiomochevina ishlab chiqarish sexi) ning tarkibida rodanit ionlari bo’lgan chiqindi oqova suvlaridan foydalanildi., The high level of development of technology and technology today leads to an increase in demand for metals. The steady growth in the production of heavy non-ferrousmetals has led to an increase in the consumption of industrial waste, which is considered notonly as a source of additional metal production, but also as a factor in reducing the cost of finished products. In the coming years, JSC Almalyk MMC plans to increase copper production by 1,5-2 times, which will lead to an increase in the amount of industrial waste (slag, gases, dust, sludge, washing solutions, waste water, etc.), and their processing requires special approach. The presence of molten metals makes them somewhat easier to separate. Because we know that in the metallurgical industry, the main costs are spent on the preparation for processing. Wastewater containing rhodanite ions from Navoiazot 201-manufactory (thiourea production shop) was used for separation of metals from copper sulphate manufactory effluents.
- Published
- 2022
- Full Text
- View/download PDF
67. Optimizing on Removal of Nickel and Zinc From Water by Employing Ceratophyllum Demersum L
- Author
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Yüksel, Mihriban, Aydın, Mehmet Emin, and NEÜ, Fen Bilimleri Enstitüsü, Çevre Mühendisliği Anabilim Dalı
- Subjects
Zinc ,Heavy metal ,Nikel ,Çinko ,Nickel ,Atıksu ,Ceratophyllum demersum L ,Wastewater ,Ağır metal ,Fitoremediasyon ,Phytoremediation - Abstract
Yüksek Lisans Tezi, Bu çalışmanın amacı, atıksulardaki nikel (Ni+2) ve çinko (Zn+2) in vitro koşullarda çoğaltılan Ceratophyllum demersum L. su bitkisi kullanılarak fitoremediasyon yöntemiyle giderim yönteminin optimize edilmesidir. Fitoremediasyon, kirleticilerin bitkiler kullanılarak arıtılması teknolojisidir. Bu teknoloji kirlilik oluşturduğu alandan organik ve inorganik maddeler, bitki kullanılarak bertaraf edilebilmektedir. Fitoremediasyon yerinde arıtım sağlar, ekstra enerjiye gereksinimi yoktur, doğal kaynaklara zarar vermez ve yüksek kabul görür. Ceratophyllum demersum L. ağır metal toleransının etkisiyle hedeflenen giderimi gerçekleştirebilen bir makrofittir. Çalışmada deiyonize su ve Koski Atıksu Arıtma Tesisinin (AAT) girişi ve çıkışından alınan gerçek atıksu kullanılarak farklı bitki konsantrasyonlarda iki tekrar ve kontrol amaçlı numuneler hazırlanmış Ni+2 ve Zn+2 giderim şartları optimize edilmiştir. Farklı bitki konsantrasyonlarında (0-7.5 g/L) ve maruz bırakılma süresi (6-48 sa) sonunda bitkilerin taze ve kuru ağırlıkları, atıksuda kalan ve bitki bünyesine alınan ağır metal miktarları, atıksu pH değişimleri, biyokonsantrasyon faktörü (BKF) ve ağır metal giderim verimleri incelenmiştir. Bitki konsantrasyonu ve maruz kalma süresi arttıkça Ni+2 ve Zn+2 gideriminin arttığı gözlenmiştir. 7.5 g/L bitki kullanımı ile 48 sa maruz kalma süresi sonunda Zn+2’da %85, Ni+2’de ise %100 giderim verimi elde edilmiştir. Aynı şartlarda BKF değeri Zn+2 için 1260 mg/kg, Ni+2 içinse 1902 mg/kg olarak tespit edilmiştir. Ni+2 ve Zn+2 birlikte gideriminin gerçekleştirildiği çalışma sonuçlarında ise 0.5 mg/L Ni+2 ve Zn+2 içeren durumda giderim veriminin değişmediği ancak konsantrasyonun artması durumunda Ni+2 gideriminin %70, Zn+2 giderimin ise %80 değerlerine azaldığı görülmüştür. AAT giriş ve çıkış atıksuyunda Ni+2 ve Zn+2 giderim sonuçları değerlendirildiğinde ise her iki atıksuda da Ni+2 ve Zn+2 için yaklaşık olarak %70 giderim verimi elde edilmiştir. Farklı koşullarda optimize edilen, iyi bir biyobelirteç ve metal biriktirebilme yeteneği olan Ceratophyllum demersum L. su bitkisinin fitoremediasyon yöntemiyle Ni+2 ve Zn+2 ile kirlenmiş su ortamlarının arıtımı için etkin bir şekilde kullanılabileceğini görülmüştür., The aim of this study is to optimize the removal of nickel (Ni+2) and zinc (Zn+2) in wastewater by phytoremediation method using aquatic plant Ceratophyllum demersum L. grown in vitro. Phytoremediation is the technology of treating pollutants using plants. Organic and inorganic substances can be disposed of using plants from the area where this technology creates pollution. Phytoremediation provides on-site treatment, does not need extra energy, does not harm natural resources, and is accepted. Ceratophyllum demersum L. is a macrophyte that can perform targeted removal due to heavy metal tolerance. In the study, two repetition and control samples of different plant concentrations were prepared using deionized water and real wastewater taken from the entrance and exit of the Koski Wastewater Treatment Plant (WWTP) and the removal conditions of Ni+2 and Zn+2 were optimized. Fresh and dry weights of plants, amounts of heavy metals left in wastewater and taken into the plant body, wastewater pH changes, bio-concentration factor (BCF) and heavy metal removal yields were examined at different plant concentrations (0-7.5 g/L) and exposure time (6-48 hr). It was observed that Ni+2 and Zn+2 removal increased as plant concentration and exposure time increased. With 7.5 g/L plant use, 85% removal efficiency was achieved in Zn+2 and 100% in Ni+2 at the end of the 48 hr exposure period. In the same conditions, BCF value was determined as 1260 mg/kg for Zn+2 and 1902 mg/kg for Ni+2 . In the results of the study, where Ni+2 and Zn+2 were carried out together, it was observed that the removal efficiency did not change in the case containing 0.5 mg/L Ni+2 and Zn+2, but if the concentration increased, Ni +2 removal decreased by 70% and Zn+2 removal decreased by 80%. When the removal results of Ni+2 and Zn+2 were evaluated in AAT inlet and outlet wastewater, approximately 70% removal efficiency was achieved for Ni+2 and Zn+2 in both wastewaters. Ceratophyllum demersum L. water plant, which is optimized under different conditions and has a good biomarker and metal accumulation ability, can be used effectively for the treatment of Ni+2 and Zn+2 contaminated water environments by phytomediation method.
- Published
- 2022
68. The Effects of Heavy Metals on Ammonium Oxidation Bacteria in Soil
- Author
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Dil, Büşra Cemile, Bedük, Fatma, and NEÜ, Fen Bilimleri Enstitüsü, Çevre Mühendisliği Anabilim Dalı
- Subjects
Bacteria ,Toxicity ,Nikel ,Kurşun ,Bakteri ,Amonyum ,Kadmiyum ,Toprak ,Soil ,Heavy metal ,Lead ,Nickel ,Amonium ,Toksisite ,Ağır metal ,Cadmium - Abstract
Yüksek Lisans Tezi, Çevresel birçok kirletici topraktaki nitrifikasyon sürecini olumsuz yönde etkileyerek toprak verimliliğini düşürebilmektedir. Bu çalışmada toksik ağır metallerden biri olan kadmiyumun (Cd) topraktaki nitrifikasyon bakterileri üzerine olan inhibisyon etkisi araştırılmıştır. Cd ile birlikte toprakta bulunabilecek olan ağır metallerden Nikel (Ni) ve kurşunun (Pb) oluşturabileceği sinerjik etki tespit edilmiştir. Çalışmada kullanılan amonyum oksidasyon toksisite testi, toprak içinde bulunan birçok bakteri türünden biri olan nitrifikasyon bakterilerinin (nitrosomonas, nitrobakter) varlığını ve sağlıklı bir şekilde bu işlemi yapıp yapamadığını belirleyen bir akut toksisite testidir. Test prensibi olarak; nitirifikasyonda bir ara ürün olan ve nitrosomonas bakterileri tarafından oluşturulan NO2 miktarı SM 4500 NO2-B metodu ile spektrofotometrik olarak ölçülmüştür. İnkübasyonun gerçekleştirildiği inkübasyon çözeltisine potasyumdihidrojenfosfat (KH2PO4); dipotasyumhidrojenfosfat (K2HPO4); sodyumklorat (NaClO3) ve diamonyum sülfat ((NH₄)₂SO₄) eklenerek nitrifikasyon teşvik edilmiştir. Nitrifikasyon bakterilerinin germinasyon periyodu olan 6 saat süre içerisinde NO2 oluşumu izlenmiş ve kirletici eklenmeyen kontrol toprak numunesine kıyasla gerçekleşen inhibisyon yüzdeleri belirlenmiştir. Hedef konsantrasyonlar belirlenirken metallerin çevrede bulunan ortalama değerleri ve çevrede yaygın olmayan yüksek değer olarak seçilmiştir. Cd 10-900 mg/kg aralığında; Ni 50-100 mg/kg aralığında; Pb 10-500 mg/kg aralığında çalışılmıştır. Cd, Ni ve Pb’un sinerjik toksik etkisi 10 mg/kg Cd; 200 mg/kg Ni ve 50 mg/kg Pb için belirlenmiştir. Deneysel çalışmalarda fizikokimyasal özellikleri belirlenmiş olan ve Konya İli, Selçuklu İlçesinden alınan toprak örneği (S) kullanılmış ve çalışmanın son basamağında matriks etkisi Konya İli, Meram İlçesinden alınan toprak örneği (M) için belirlenmiştir. S-Toprak örneğinin nitrifikasyon potansiyeli ortalama 7.4 mg NO2-N/kg.toprak.km olarak belirlenmiştir. İnkübasyon süresi sonunda gerçekleşen inhibisyon oranları değerlendirildiğinde çevrede yaygın olarak görülen 10 mg/kg.Cd konsantrasyonunda yaklaşık %20 seviyesinde inhibisyon olduğu tespit edilmiştir. 300-900 mg.Cd/kg konsantrasyonunda nitrifikasyon bakterilerinin %50’sinin inhibe olduğu tespit edilmiştir. Ni’in çevrede yaygın olarak bulunan 50-500 mg.Ni/kgkonsantrasyon aralığında topraktaki nitrifikasyon üzerindeki inhibisyon etkisi inkübasyon süresinin sonunda yaklaşık %20’ler seviyesinde olmuştur. Pb’un nitrifikasyon bakterileri üzerinde akut toksik etkisi diğer metallerden farklı olarak inkübasyon süresinin başında oldukça yüksek seviyelere ulaşmıştır. Ancak inkübasyon süresinin sonunda inhibisyon azalmış ve %30 seviyesinde kalmıştır. 20 mg/kg Cd, 200 mg/kg Ni ve 50 mg/kg Pb’un sinerjik olarak oluşturduğu etkinin inkübasyon süresi boyunca yaklaşık olarak %50 seviyesinde olduğu tespit edilmiştir. M-Toprak örneği ile yapılan çalışmada farklı özellikteki toprağın nitrifikasyon potansiyelinin değiştiği belirlenmiştir. Nitrifikasyon potansiyeli daha yüksek olan M-Toprağında ağır metallerin sinerjik toksik etkisi %40 seviyesinde gerçekleşmiştir., Environmental pollutants can negatively affect the nitrification process in the soil and reduce soil fertility. In this study, the inhibition effect of cadmium (Cd), one of the toxic heavy metals, on nitrifying bacteria in soil was investigated. The synergistic effect of nickel (Ni) and lead (Pb), which can be found in the soil together with Cd, has been determined. The ammonium oxidation toxicity test used in the study is an acute toxicity test that determines the presence of nitrifying bacteria (nitrosomonas, nitrobacter), and whether they can do this in a healthy way. As the test principle; The amount of NO2 , which is an intermediate in nitrification and produced by nitrosomonas bacteria, was measured spectrophotometrically by the SM 4500 NO2-B method. Nitrification was promoted by adding potassium dihydrogenphosphate (KH2PO4), dipotassiumhydrogenphosphate (K2HPO4); sodium chlorate (NaClO3) and diammonium sulfate (NH₄)₂SO₄ to the incubation solution. Within 6 hours, which is the germination period of nitrifying bacteria, NO2 formation was monitored and the inhibition percentages were determined compared to the control soil sample, not containing any pollutants. While determining the target concentrations, the average values of metals found in the environment and the high value that is not common in the environment were chosen. Cd has been studied in the range of 10-900 mg/kg; Ni; in the range of 50-100 mg/kg; and Pb; in the range of 10-500 mg/kg. Synergistic toxic effect of Cd, Ni and Pb was determined for 10 mg/kg Cd; 200 mg/kg Ni and 50 mg/kg Pb. Soil sample (S) taken from Konya Province, Selçuklu District, of which physicochemical properties were determined in the experimental studies, was used and in the last step of the study, the matrix effect was determined for the soil sample (M) taken from Konya Province, Meram District. The nitrification potential of the S-Soil sample was determined as 7.4 mg NO2-N/kg.soil.km. When the inhibition rates at the end of the incubation period were evaluated, it was determined that there was approximately 20% inhibition at the concentration of 10 mg/kg.Cd, which is common in the environment (EC20). It was determined that 50% of nitrifying bacteria were inhibited at 300-900 mg/kg.Cd concentration (EC50). The inhibition effect of Ni on nitrification in the soil in the concentration range of 50-500 mg/kg.Ni, was approximately 20% at the end of the incubation period. Unlike other metals, the acute toxic effect of Pb on nitrifying bacteria reached very high levels at the beginning of the incubation period. However, at the end of the incubation period, the inhibition decreased and remained at the 30% level. It was determined that the synergistic effect of 20 mg/kg Cd, 200 mg/kg Ni and 50 mg/kg Pb was approximately 50% during the incubation period. In the study conducted with the M-Soil sample, it was determined that the nitrification potential of soil with different properties changed. In M-Soil, which has a higher nitrification potential, the synergistic toxic effect of heavy metals was realized at the level of 40%.
- Published
- 2022
69. Mikroplastik ve Biyokatı Varlığında Toprakta Nikel Toksisitesinin Belirlenmesi
- Author
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ULUTUĞ, Fatma Cansu and TOPUZ, Emel
- Subjects
Environmental Engineering ,Çevre Mühendisliği ,Mikroplastik ,nikel ,biyokatı ,toksisite ,Microplastic ,nickel ,biosolid ,toxicity - Abstract
Plastics, which occupy a large place in our lives, have also brought along various environmental problems with their widespread use. Microplastics can accumulate in the sewage sludge of Wastewater Treatment Plants, and then the use of these sludges in agricultural lands may cause the spread of pollutants such as heavy metals and microplastics for which the toxic effects are not clear, yet. Nickel is one of the heavy metals that pose a risk in agricultural lands, and it is also limited by the relevant regulations. However, the change in the toxicity of Nickel in the presence of potential pollutants such as microplastics and biosolids, whose effects have just begun to be investigated, has not been examined. In this context, nickel toxicity was investigated in the presence of microplastics and biosolids. The effects on reproduction on E. Crypticus, which is used as a representative of living things living in the soil, were determined by EC50 values. Accordingly, both microplastics and biosolids applications had a decreasing effect on Nickel toxicity. This can be explained by the neutralization of Nickel for which toxicity is sourced from ion forms by complexing with organic substances in the biosolid or interacting with charged surface groups that may be present on the microplastic surface., Hayatımızda büyük bir yer kaplayan plastikler bu yaygın kullanımlarıyla aynı zamanda çeşitli çevre sorunlarını da beraberinde getirmiştir. Atıksu Arıtma Tesislerinin arıtma çamurlarında mikroplastikler birikebilmekte ve daha sonra bu çamurların tarım arazilerinde kullanılması ağır metaller ve mikroplastikler gibi henüz çevreye etkileri net olmayan kirleticilerin yayılmasına neden olabilmektedir. Tarım arazilerinde risk arz eden ağır metallerden biri Nikel olup ilgili yönetmeliklerle de sınırlandırılmıştır. Ancak, mikroplastik ve biyokatı gibi etkileri yeni incelenmeye başlayan potansiyel kirletici kaynaklar ile bulunması durumunda Nikelin toksisitesinde meydana gelebilecek değişim incelenmemiştir. Bu kapsamda, mikroplastik ve biyokatı varlığında Nikel toksisitesi incelenmiştir. Toprakta yaşayan canlıları temsilen kullanılan E. Crypticus üzerinde üremeye olan etkileri EC50 değerleri ile belirlenmiştir. Buna göre hem mikroplastikler hem de biyokatı uygulamaları Nikel toksisitesini düşürücü yönde etki etmiştir. Bu durum, Nikelin biyokatıdaki organik maddelerle kompleks oluşturarak ya da mikroplastik yüzeyinde bulunabilecek yüklü yüzey gruplarıyla etkileşime girerek toksik etkiyi meydana getirdiği bilinen iyonik formun nötrleşmesi ile açıklanabilir.
- Published
- 2021
70. Photosensitivity spectrums of Ni-n-GaAs surface-barrier structures
- Author
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Melebayew D., Melebayewa G. D., Rud Yu. V., and Rud V. Yu.
- Subjects
photosensitivity ,metal semiconductor ,nikel ,structure ,chemical method ,photocurrent ,lighting ,semitransparent layer ,infrared ,Electrical engineering. Electronics. Nuclear engineering ,TK1-9971 - Abstract
The paper presents research results on the photosensitivity spectra of the obtained Ni-n-GaAs structures in the photon energy range 0.9 ... 2.3 eV when the side covered with translucent nickel layer is illuminated. It has been experimentally established for the first time that photons with energy 0.9 ... 1.25 eV do not create excited electrons in the Ni layer, and electron emission from Ni does not occur in GaAs. The prospects of application of Ni-n-GaAs photosensitive structures to create solar cells are shown.
- Published
- 2008
71. Lead, Nickel, and Copper removal by chemical precipitation using calcined Black Sea mussel shells
- Author
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ÖZCAN, Ahmet Can and GÜREL, Levent
- Subjects
Kalsine midye kabuğu ,kurşun ,nikel ,bakır ,kimyasal çöktürme ,Engineering ,Mühendislik ,Calcined mussel shell ,lead ,nickel ,copper ,chemical precipitation - Abstract
Bu çalışmada, kalsine Karadeniz midye kabukları kullanılarak kimyasal çöktürmeyle atıksulardan ağır metallerin giderimi araştırılmıştır. Kullanılan midye kabuğu öncelikle toz haline getirilmiş daha sonra kalsinasyon ön işlemi uygulanarak kalsine midye kabuğu tozu elde edilmiş ve bu madde kurşun, nikel ve bakır ağır metallerinin giderimi çalışmalarında kullanılmıştır. Çalışmalarda ayrıca karşılaştırma amacıyla geleneksel kalsiyum hidroksit ve sodyum hidroksit kimyasallarının kimyasal çöktürme performansı da incelenmiştir. Tüm çöktürücü ajanlar için dozaj deneyleri ve başlangıç ağır metal konsantrasyonu deneyleri gerçekleştirilerek, en uygun arıtım koşulları belirlenmiştir. Deneyler neticesinde kalsine midye kabuğu tozu ile kurşun, nikel ve bakır ağır metallerinin arıtımında sırasıyla %98,79, %99,67 ve %99,37’lik yüksek arıtım verimleri elde edilmiştir. Kalsine midye kabuğu tozu ve diğer kimyasalların birbirlerine yakın dozajlarında etkili ağır metal gideriminin sağlanabildiği tespit edilmiştir. Midye kabuğu sağladığı bu yüksek verimlere karşın daha düşük nihai pH değerlerinin elde edilmesine neden olmuştur. Tüm bu hususlar bir arada değerlendirildiğinde kalsine midye kabuğu tozunun doğal bir materyal olması ve doğada bol miktarda bulunması nedeniyle diğer çöktürücü ajanlara bir alternatif olabileceği ortaya konmuştur., In this study, removal of heavy metals from wastewaters by chemical precipitation using calcined Black Sea mussel shells was investigated. The mussel shell used was primarily powdered and then calcined mussel shell powder was obtained by applying calcination pretreatment, and this material was used in removal studies of lead, nickel, and copper heavy metals. The chemical precipitation performance of conventional calcium hydroxide and sodium hydroxide chemicals was also examined to make a comparison in the studies. The most suitable treatment conditions were determined by conducting dosage and initial heavy metal concentration experiments for all precipitating agents. As a result of experiments, high treatment efficiencies such as 98.79, 99.67 and 99.37% were achieved in treatment of lead, nickel, and copper heavy metals by calcined mussel shell powder, respectively. It has been determined that effective heavy metal removal can be achieved at close dosages of calcined mussel shell powder and other chemicals. Mussel shell caused to obtain lower final pH values despite providing these higher efficiencies. When all these factors are considered together, it has been exhibited that calcined mussel shell powder can be an alternative to other precipitating agents because it is a natural material and abundant in nature.
- Published
- 2021
72. Demir ve Nikel Birlikte Katkılı Titanyum dioksit İnce Filmlerin Görünür Işık Fotokatalitik Aktiviteleri.
- Author
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Yurtsever, Hüsnü Arda and Çiftçioğlu, Muhsin
- Abstract
Copyright of Adiyaman University Journal of Science & Technology / Adıyaman Üniversitesi Fen Bilimleri Dergisi is the property of Adiyaman University, Institute of Science / Adiyaman Universitesi Fen Bilimleri Enstitusu and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2015
73. DOĞRUDAN METANOLLÜ YAKIT HÜCRELERİ İÇİN TiO2 DESTEKLİ ANOT GELİŞTİRİLMESİ
- Author
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Ali Döner, Asaf Tolga Ulgen, Mehmet Haskul, Ülgen, Asaf Tolga, Döner, Ali, and Haskul, Mehmet
- Subjects
elektrokimyasal çöktürme ,nikel ,Nikel ,lcsh:T ,Mühendislik ,lcsh:Technology ,Elektrokimyasal çöktürme ,Engineering ,TiO2-nanotüp ,lcsh:TA1-2040 ,tio2-nanotüp ,Yakıt Hücreleri ,Yakıt Hücreleri,TiO2-nanotüp,Elektrokimyasal çöktürme,Nikel ,lcsh:Engineering (General). Civil engineering (General) ,yakıt hücreleri - Abstract
Metanollu yakit hucreleri icin yuksek sirali ve kaliteli TiO 2 nano-tupler (TiO 2 -NTs) katalizor destegi olarak hazirlanmistir. Sirali TiO 2 -NTs hazirlandiktan sonra yuzeyine kucuk miktarlarda nikel (Ni) nanotanecikleri (TiO 2 -NTs-Ni) elektrokimyasal olarak cokturulmustur. Bu sekilde hazirlanan anot katalizorlerinin yuzey ve kristal yapisi sirasiyla taramali elektron mikroskobu (SEM), donusumlu voltametri (CV) ve X-isini kirinimi (XRD) ile karakterize edilmistir. Hazirlanan TiO 2 -NTs-Ni anot katalizorlerinin metanol oksidasyonu icin katalitik aktiviteleri 1 M KOH iceren 1 M Metanol cozeltisinde CV ve zamanla kararliliklari ve dayanikliklari kronoamperometri (CA) teknigi ile arastirilmistir. Elde edilen sonuclara gore TiO 2 -NTs metanollu ortamda aktivite gostermemis bununla beraber yuzeyi az miktarda Ni ile kaplanmasi metanol oksidasyonunu arttirmistir. Katalizor yuzeyindeki Ni miktari arttikca oksidasyon hizi artmaktadir. CV tarama hizi arttikca oksidasyon pik akimlarinda artis gozlemlenmistir. CA sonuclarina gore hazirlanan katalizorler bir saat boyunca calisilan ortamda kararli ve dayanikli yapi sergilemistir. Hazirlanan TiO 2 -NTs-Ni metanollu yakit hucreleri icin etkin bir anot katalizoru olarak kullanilabilir.
- Published
- 2019
74. PENGARUH PENAMBAHAN UNSUR NIKEL/ KARBON PADA DEPOSIT LAS ELEKTRODA E6013 TERHADAP SIFAT MEKANIK
- Author
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Syaripuddin, Khotijah Rohma, and Ferry Budhi Susetyo
- Subjects
Karbon ,SMAW ,Nikel ,Struktur Mikro ,Elektroplating ,Kekerasan ,E6013 - Abstract
ABSTRAK Penelitian ini bertujuan untuk mengetahui adakah pengaruh pelapisan nikel dan penambahan unsur karbon pada elektroda E6013 terhadap sifat mekanik hasil pengelasan baja karbon rendah yang menyangkut nilai kekerasan. Metode dalam penelitian ini adalah metode eksperimen. Penelitian ini menggunakan jenis baja berkarbon rendah yang mengandung unsur kimia 0,158% C, 0,013% Si, 0,86% Mg, 0,015% Fosfor, 0,016 % S dan 98,9% Fe. Lalu menggunakan elektroda E6013 di elektroplating Nikel dan adanya penambahan unsur Karbon.. Pengelasan menggunakan jenis las SMAW. Hasil penelitian menunjukkan bahwa nilai kekerasan paling tinggi terdapat pada sambungan SMAW pelat baja yang di las menggunakan elektroda yang telah dilapisi Nikel dan ditambahkan Karbon. Dengan menambahkan Nikel kekerasan pada permukaan baja yang di las lebih meningkat dari 144.8 VHN menjadi 278.86 VHN. Dengan menambahkan Karbon kekerasan pada permukaan baja lebih meningkat dari 144.8 VHN menjadi 247.9 VHN. Dengan menambahkan Nikel dan Karbon kekerasan pada permukaan baja lebih meningkat dari 132.28 VHN menjadi 445.88 VHN. Kata kunci: SMAW, Elektroplating, Nikel, Karbon, Struktur Mikro, dan Kekerasan, E6013
- Published
- 2019
- Full Text
- View/download PDF
75. Tekirdağ İli Topraklarının Krom ve Nikel İçerikleriyle Bazı Fizikokimyasal Özellikleri Arasındaki İstatistiksel İlişkiler.
- Author
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Adiloğlu, S. and Sağlam, M. T.
- Abstract
The aim of this research was to determine the some statistical relationships between Cr and Ni contents and some physicochemical properties of near the motorway soils Tekirdağ Province. For this purpose, soil samples were taken from 50 different agricultural lands near the motorway in Saray, Çerkezköy and Çorlu districts. According to the results, extractable Cr contents of soil samples were determined between 0,034 and 0,390 mg kg-1 and extractable Ni contents of soil samples were determined between 7,410 and 1,623 mg kg-1. Chromium and Ni pollution were not determined in the soils, presently. Between clay, lime and pH values of soils samples and Cr, Ni contents of the soils were determined statistically significant relations at the level of 5 %. On the other hand, between organic matter amount of soils samples and Ni contents were determined statistically significant relations at the level of 5 % but this relation was not significant determined for Cr contents of soil samples. [ABSTRACT FROM AUTHOR]
- Published
- 2015
76. Ayvalık Tuzlasında Yayılış Gösteren Suaeda prostrata subsp. prostrata Pall. Alttürünün Ağır Metal Birikimi.
- Author
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KILIÇ, Murat, AY, Güngör, KOÇBAŞ, Fatma, MUNGAN, Fatma, KULA, İbrahim, and KARABAŞ, Muhammet
- Abstract
In this study, were determined level of Pb, Zn, Cd and Ni in Suaeda prostrata subsp. prostrata Pall. which is spread in Ayvalık Saltern is partaking Izmir-Canakkale highway. Analysis were done by using Perkin Elmer Analyst 700 Flame Atomic Absorption Spectrophotometer (FAAS) device. The root, stem, leaves and cultivation soil of plant was formed material of this study. Sampling, were done 8 station which is determined on the soil dam is surrounding saltern. Through 12 months, samples regulary receipt from every station. As a result of all analysis, we saw the level Pb <0.001-1.026 ppm, Zn 0.016-1.389 ppm, Cd <0.001-0.166 ppm and Ni 0.006-0.809 ppm in the soil Pb 0.523-1.599 ppm, Zn 0.143-1.248 ppm, Cd 0.006-0.298 ppm and Ni 0.112-1.098 ppm... The fact that the results İn the analysis are below the limit values is because of the fact that the dominant diraction of the wind is North-west (through Tuzla motorway), there aren't any crossroads or signalization on the motorway on the soutern part of Tuzla and there aren't any industrial plants having polluting effects. [ABSTRACT FROM AUTHOR]
- Published
- 2014
77. Isothermal tuning of exchange bias using pulsed fields
- Subjects
Atomic force microscopy ,Antiferromagnetism ,Coercive force ,Exchange interactions ,Nikel ,Ferromagnetism ,Anisotropy - Published
- 2021
78. Elektrokoagülasyon yöntemi ile ağır metal giderimi ve bir endüstriyel simbiyoz uygulaması
- Author
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Arslan, Mürüvvet, Aşkın, Ayşegül, and ESOGÜ, Mühendislik Mimarlık Fakültesi, Kimya Mühendisliği Anabilim Dalı
- Subjects
Endüstriyel Simbiyoz ,Ağır Metal Giderimi ,Nikel ,Nickel ,Elektrokoagülasyon ,Electrocoagulation ,Heavy Metal Removal ,Industrial Symbiosis - Abstract
Elektrokoagülasyon yöntemi ile nikel içeren atık suyun arıtımı gerçekleştirilmiştir. Elektrokoagülasyon işleminde özel tasarlanmış demir ve aluminyum elektrotlar kullanılmıştır. Deney parametrelerinin nikel giderim verimi ve enerji tüketimi üzerindeki etkisi “cevap yüzey” temelinde “Merkezi Karma Tasarım (Central Composite Design)” Design Expert 11 programı ile değerlendirilerek parametrelerin birbirleriyle ilişkileri belirlenmiştir. Hem Fe hem de Al elektrot kullanılarak modelin belirlediği 30 adet 15’er dakikalık elektrokoagülasyon deneyleri sonucunda, 4 faktör (akım yoğunluğu, pH, başlangıç derişimi, NaCl derişimi) beş seviyede parametrelerin nikel giderim verimi ve enerji tüketimi üzerine etkisi incelenmiştir. Ayrıca, arıtım sonunda geriye kalan elektokoagülasyon çamuru, seramik karo üretiminde değerlendirilerek bir endüstriyel simbiyoz uygulaması yapılmıştır The treatment of waste water containing nickel was carried out by electrocoagulation method. Specially designed iron and aluminum electrodes are used in the electrocoagulation process. The effects of the experimental parameters on the nickel removal efficiency and energy consumption were evaluated with the "Central Composite Design" Design Expert 11 program on the basis of "response surface" and the relations of the parameters with each other were examined. As a result of 30 pieces of 15-minute electrocoagulation experiments determined by the model using both Fe and Al electrodes, the effects of 4 factors (current density, pH, initial concentration, NaCl concentration) at five levels on nickel removal efficiency and energy consumption were investigated. The effects of operating parameters such as pH, current density, initial Ni concentration and supporting electrolyte concentration on removal efficiency and energy consumption were investigated. In addition, the electrocoagulation sludge remaining at the end of the treatment was evaluated in the production of ceramic tiles and an industrial symbiosis application was made
- Published
- 2021
79. The assessment of cadmium, nickel and copper tolerance and bioaccumulation of purslane (Portulaca oleracea L.)
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Erkoç, Havva Aybike, Çolak Esetlili, Bihter, and Ege Üniversitesi, Fen Bilimleri Enstitüsü, Toprak Bilimi ve Bitki Besleme Ana Bilim Dalı
- Subjects
Nikel ,Semizotu ,Nickel ,Biyoakümülasyon ,Bakır ,Kadmiyum ,Purslane ,Bioaccumulation ,Copper ,Cadmium - Abstract
Endüstriyel ve tarımsal faaliyetlerin gün geçtikçe artması ve buna bağlı olarak teknolojinin hızla gelişmesi ile birlikte toprak kirliliği ciddi boyutlara ulaşmaya başlamıştır. Tarım alanlarının ve bu alanlarda yetişen ürünlerin artan bir biçimde kirlenmesi, günümüzün en önemli sorunları arasında gelmektedir. Fitoremediasyon yöntemi ise ağır metallerin topraktan temizlenmesi için en uygun yöntemlerden biridir. Çalışmada, yapay olarak kadmiyum (Cd), nikel (Ni) ve bakır (Cu) ile kirlenmiş topraklarda yetiştirilen, semizotu bitkisinin biyoakümülasyon yeteneğinin değerlendirilmesi amaçlanmıştır. Kontrollü şartlarda kurulan denemede, farklı dozlarda Cd (0, 5, 10, 20 mg kg-1), Ni (0, 20, 40, 80 mg kg-1) ve Cu (0, 70, 140, 210 mg kg-1) uygulanan topraklarda semizotu (Portulaca oleracea L) bitkisi yetiştirilmiştir. Sera şartlarında 3 tekrarlı olarak yetiştirilen bitkiler 55 gün sonunda hasat edilmiş, kök, gövde ve yaprak aksamlarında Cd, Ni ve Cu analizleri yapılmıştır. Semizotu Cd, Ni ve Cu akümülasyonu değerlendirildiğinde, ortamın ağır metal konsantrasyonunun bitkinin ağır metal içeriği üzerine doğrudan etkili olduğu, bu metallerin özellikle kök bölgesinde birikim gösterdiği belirlenmiştir. Ayrıca artan Cd, Ni ve Cu uygulamalarına bağlı olarak yaprak klorofil içeriğinin olumsuz etkilendiği saptanmıştır., The increase in industrial and agricultural activities day by day and the rapid development of technology induce soil pollution to serious dimensions. Pollution of agricultural lands and the crops grown in these areas are the main problems of today. Phytoremediation method is one of the most suitable way for removing heavy metals from the soil. The objective of this study was to examine the bioaccumulation capacity of purslane plants (Portulaca oleracea) grown in soils which were artificially contaminated with cadmium (Cd), nickel (Ni) and copper (Cu) under greenhouse conditions. In the experiment, plants were treated with different doses of Cd (0, 5, 10, 20 mg kg-1), Ni (0, 20, 40, 80 mg kg-1) and Cu (0, 70, 140, 210 mg kg-1) with 3 repetitions and a control. Harvest was at the end of 55 days and Cd, Ni and Cu contents were measured in root, stem and leaf parts. Results showed that the accumulations of Cd, Ni and Cu in purslane plants are directly related to the presence of these heavy metals in the growing media. Findings also indicated that metals accumulated especially in the root region. In addition, leaf chlorophyll contents were negatively affected due to increased Cd, Ni and Cu applications.
- Published
- 2021
80. SUDAN KURŞUN VE NİKEL İYONLARININ Verbascum cheiranthifolium L. MATERYALİ İLE GİDERİMİ.
- Author
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DURSUN, Şükrü and KÖYSÜREN, H. Nagehan (UÇAN)
- Abstract
In this research, removal Pb(II) and Ni(II) ions from aqueous solutions by modified mullein (Verbascum cheiranthifolium BOISS. var. cheiranthifolium) plant material was investigated. Effects of modification method on the adsorption capacity improvement for removal of these heavy metals ions have been investigated. Structures of modified mullein plant materials before and after modifications process were examined by the FTIR and SEM analyses. Modification processes were performed using HCl acid solutions. The investigations of kinetic, isotherm and thermodynamic parameters were also studied for HCl modified mullein plant material. The regeneration processes were studied for the determination of modified mullein plant material's reusability after the adsorption processes. Additional costs for applied modification processes were calculated and compared with the other classical methods. The chemical oxygen demand residues in treated water by modified mullein plant material comparing raw materials were decreased from 910-1430 mg/L to 10-90 mg/L with the modification processes. The removal efficiencies changed with heavy metal concentration in water sample and increased about 70% for modified mullein plant material. Heavy metal adsorption capacities were found maximum about 90 mg/g according to type of adsorbent and modification process. As a result, it was revealed that adsorption capacities and costs efficiency of adsorbent were compatible with conventional adsorbents. [ABSTRACT FROM AUTHOR]
- Published
- 2014
81. Katı Faz Ekstraksiyonu ile Bakır ve Nikelin Onderiştirilmesinde ONNO ve ONO Tipi Schiff Bazlarının Karşılaştırılmas.
- Author
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Dinçer Kaya, Fadime Nazlı, Atakol, Orhan, and Doğan, Selda
- Abstract
In this study, Schiff bases of ONO type, tridentate, N-(2-hydroxyphenyl)-2-hydroxy-1-naphthaldymine and ONNO type, tetradentate, Bis-N,N'-(2-hydroxy-1 - naphthaldymine)-1,3-propandiamin were adsorbed on to silica gel to form two adsorbtion materials that used for solid phase extraction. These adsorption materials were investigated for enrichment of Cu2+ and Ni2+ ions. pH, eluent type, flow rate and the effects of foreign ions were examined for every ions. The concentrations of Ni2+ and Cu2+ ions were determined with flame atomic absorption spectroscopy. The study was carried out between pH 2 and 9 in order to select an optimum pH value. The regain value in the pre concentration process was observed to reach above 90% after pH value of 5 for ONNO type ligand. The regain value of ONO type ligand was below 90%. LOD and LOQ was calculated as 0,008 µg/mL and 0,024 µg/mL for Cu2+ respectively. Also LOD and LOQ was calculated as 0,016 µg/mL and 0,048 µg/mL for Ni2+. The accuracy of the method was tested by certificated reference standard materials, CRM BCR-397 human hair and NIST 2976 mussel tissue. [ABSTRACT FROM AUTHOR]
- Published
- 2014
82. Mesleksel nikel dermatiti.
- Author
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AYTEKIN, Asla and YILMAZ, Hinç
- Subjects
- *
ALLERGY diagnosis , *SKIN inflammation diagnosis , *SKIN inflammation , *EPIDEMIOLOGY , *NICKEL , *OCCUPATIONAL diseases , *SEX distribution , *PREVENTION - Abstract
Thirty percent of all occupational diseases in industrial societies are occupational skin diseases. An important part of occupational skin diseases is contact dermatitis with respect to epidemiological data. Metals are the most common contact allergens and nickel is the most common among them. Nickel sensitivity in women is particularly related to jewelry, including earrings and other accessories. Especially all kinds of earrings, apparels and their metal clasps, buttons and buckles, coins, keys, frames of glasses and many more different kinds of products contain nickel. Nickel sensitivity in men is primarily occupational. Previous studies have shown that occupational exposure to nickel is seen in many industrial groups including alkaline battery manufacturing, zinc and brass dimming, electroplated coating, welding and electrical wiring. Nickel dermatitis may also occur in hairdressers, musicians and tailors. Nickel dermatitis was found to be associated with dietary nickel. Nickel sensitivity has been determined as higher in smokers than in non-smokers. Patch tests are mainly used for the diagnosis of nickel sensitivity. Reducing nickel exposure is essential for prevention of nickel dermatitis. In this paper, in the light of the literature, occupational groups more prone to nickel dermatitis and diagnosis and prevention of nickel dermatitis are reviewed. [ABSTRACT FROM AUTHOR]
- Published
- 2014
- Full Text
- View/download PDF
83. Teucrium as a Novel Discovered Hyperaccumulator for the Phytoextraction of Ni-contaminated Soils.
- Author
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YAMAN, Mehmet
- Abstract
Copyright of Ekoloji Dergisi is the property of Ekoloji Dergisi and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2014
- Full Text
- View/download PDF
84. POTENSI SLAG NIKEL HALUS (FeNi 4) PT. ANTAM POMALAA SEBAGAI AGREGAT HALUS PADA CAMPURAN ASPAL
- Author
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Dimas Manggala Putra, Nasrul Nasrul, and Edward Ngii
- Subjects
Slag ,Antam ,Nikel ,Aspal ,Agregat - Abstract
Slag nikel (FeNi4) adalah jenis terbaru dengan ukuran butiran mendekati pasir (lolos No. 8). Jumlah buangan slag nikel telah mencapai 1 juta ton pada tahun 2018, sehingga berbahaya bagi lingkungan jika tidak dimanfaatkan secara luas. Disisi lain kebutuhan agregat halus campuran aspal jenis Hot Rolled Sheet (HRS-WC) sangat tinggi. Penelitian ini bertujuan untuk mengetahui potensi pemanfaatan slag nikel FeNi4 sebagai agregat pada campuran aspal jenis HRS.Slag nikel (FeNi4) diperoleh dari PT. Antam Pomalaa. Penelitian dirancang dengan tiga variasi penggunaan slag terhadap agregat halus standar yaitu Variasi 1 (0/100%); Variasi 2 (50/50%); dan Variasi 3 (100/0%). Penyetaraan berat jenis dilakukan untuk menghitung jumlah slag yang digunakan. Jumlah sampel sebanyak 45 sampel dan diuji menggunakan alat Marshall Test. Spesifikasi yang digunakan dalam penelitian mengacu pada Bina Marga 2010.Hasil penelitian menunjukkan bahwa pada benda uji Variasi 2 (50/50%) masih diperoleh kadar aspal optimum sebesar 6,319%, hampir sama dengan kadar aspal optimum benda uji kontrol sebesar 6,331%, namun dengan range kadar aspal yang lebih sempit. Temuan ini menunjukkan bahwa slag nikel FeNi4 sangat berpotensi digunakan dalam campuran HRS-WC namun dibatasi sampai 50%. Penelitian lanjutan dapat lakukan untuk mengetahui karakteristik campuran HRS-WC pada penggunaan slag nikel FeNi4 dibawah 50%. Kata Kunci : Slag, Antam, Nikel, Aspal, AgregatABSTRACTNickel slag (FeNi4) is the latest type that was close to sand material (pass No.8). The amount of nickel slag discharges reached 1 million tons in 2018, making it dangerous for the environment if not widely used. On the other hand, the need for fine aggregate asphalt mix type Hot Rolled Sheet (HRS) is very high. This study aims to determine the potential use of FeNi4 nickel slag as fine aggregate in the HRS mixture.Nickel slag (FeNi4) obtained from PT. Antam Pomalaa. The study was designed with three variations of the use of slag against standard fine aggregates, namely Variation 1 (0/100%); Variation 2 (50/50%); and Variation 3 (100/0%). Equal density is done to calculate the number of slags used. The total sample is 45 samples and tested using Marshall Test. The specifications used in the study refer to the 2010 Bina Marga.The results showed that Variation 2 (50/50%) of the specimens were still obtained optimum asphalt content of 6.319%, almost the same as the optimum asphalt content of control specimens of 6.331%, but with a narrower range of asphalt content. These findings indicate that FeNi4 nickel slag is very potentially used in HRS-WC mixtures but is limited to 50%. Further research can be done to determine the characteristics of the HRS-WC mixture on the use of FeNi4 nickel slag below 50%. Keywords : Slag, Antam, Nickel, Asphalt, Aggregate
- Published
- 2020
85. MIS ISHLАB CHIQАRISH TEXNOLOGIK ERITMАLАRIDAN METALLARNI CHOʼKTIRUVCHI REАGENTLАR YORDAMIDA АJRАTISH
- Author
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Xoliqulov Doniyor Baxtiyorovich, Boltayev Olmos Najmidinovich, and Xaydaraliev Xolbay Rustam O’G’Li
- Subjects
НИКЕЛЬ ,ТЕХНОЛОГИЧЕСКИЙ РАСТВОР ,NICKEL ,AMMONIY RODANID ,MIS KUPOROS ,HYDROMETALLURGY ,ЭЛЕКТРОЛИТ ,AMMONIUM THIOCYANATE ,MIS SULFATI ,TANLOVCHANLIK ,PRECIPITATING AGENT ,PROCESS SOLUTION ,GIDROMETALLURGIYA ,CHO’KTIRUVCHI REAGENT ,ELEKTROLIT ,МЕДНЫЙ КУПОРОС ,СУЛЬФАТ МЕДИ ,РОДАНИД АММОНИЯ ,TEXNOLOGIK ERITMA ,ГИДРОМЕТАЛЛУРГИЯ ,SELECTIVITY ,СЕЛЕКТИВНОСТЬ ,NIKEL ,COPPER SULFATE ,ОСАЖДАЮЩИЙ РЕАГЕНТ ,ELECTROLYTE - Abstract
Bugungi kunda texnika va texnologiyalarning yuqori darajada rivojlanishi metallar isteʼmoliga boʼlgan talabni ortishiga olib kelmoqda. Ogʼir rangli metallarni ishlab chiqarishning uzluksiz oʼsishi texnogen chiqindilarni isteʼmolini koʼpayishiga olib keldi, bu nafaqat metallarni qoʼshimcha ishlab chiqarish manbai, balki tayyor mahsulot tannarxini pasaytirish omili sifatida ham koʼrib chiqilmoqda. Yaqin yillarda "Olmaliq KMK" АJ mis ishlab chiqarish hajmini 1,5-2 baravar oshirishni rejalashtirmoqda, buning natijasida texnogen chiqindilar (shlaklar, gazlar, chang, shlam, yuvish eritmalari, chiqindi suv va boshqalar)ning miqdorini xam ortishiga olib keladi, ularni qayta ishlash esa maxsus yondashuvni talab qiladi. Bu holda qoʼllaniladigan texnologiyalar chiqindilar, shlaklar, atrof muhitga zararli gazlar va changning atmosferaga chiqarilishi bilan metallning yuqori darajada qaytarib boʼlmaydigan yoʼqotishlari bilan tavsiflanadi. Mis kuporos ishlab chiqarishda hosil boʼladigan texnologik eritmalar tarkibidagi mis va nikelni alohida ajratishda reagent sifatida ammoniy rodaniddan foydalanildi., The high level of development of technology and technology today leads to an increase in demand for metals. The steady growth in the production of heavy non-ferrous metals has led to an increase in the consumption of industrial waste, which is considered not only as a source of additional metal production, but also as a factor in reducing the cost of finished products. In the coming years, JSC Almalyk MMC plans to increase copper production by 1,5-2 times, which will lead to an increase in the amount of industrial waste (slag, gases, dust, sludge, washing solutions, waste water, etc.), and their processing requires special approach. The technologies used in this case are characterized by extremely irreversible losses of metal with waste, slag, emission of harmful gases and dust into the atmosphere. Ammonium thiocyanate was used as a reagent for separating copper and nickel from technological solutions in the production of copper sulfate.
- Published
- 2020
- Full Text
- View/download PDF
86. Pasvikprogrammets terrestriske overvåking. Endringer i mengde av tungmetaller i biologisk materiale og i lavdekning på trær
- Author
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Bjerke, Jarle W., Myking, Tor, Nyeggen, Hans, and Aarrestad, Per Arild
- Subjects
epiphytes ,Naturens tilstand ,state of nature ,Nikel ,air pollution ,NINA Rapport ,Epifytter ,Sør-Varanger Municipality ,Nikel in Russia ,Finnmark County ,heavy metal concentrations ,Pasvik ,Russland ,Luftforurensing ,Lav ,lichens ,Sør-Varanger kommune ,Miljøovervåking ,Tungmetaller ,Finnmark fylke ,environmental monitoring - Abstract
Bjerke, J.W., Myking, T., Nyeggen, H. & Aarrestad, P.A. 2019. Pasvikprogrammets terrestriske overvåking. Endringer i mengde av tungmetaller i biologisk materiale og i lavdekning på trær. NINA Rapport 1751. Norsk institutt for naturforskning. Effekter på skogøkosystemer i grensetraktene Norge-Russland-Finland av luftforurensing fra smelteverket i Nikel og briketteringsanlegget i Zapoljarnij noen få km fra grensen mot Norge har vært overvåket i de siste tiårene i ulike overvåkingsprogrammer. Norske lokaliteter for overvåking av tungmetaller i biologisk materiale og forekomst av lav på trær ble sist gang analysert i 2004. Fylkesmannen i Troms og Finnmark engasjerte i 2019 forskere fra Norsk institutt for naturforskning (NINA) og Norsk institutt for bioøkonomi (NIBIO) for å oppdatere kunnskapen rundt tung-metaller og forekomst av lav, slik at det ville være mulig å påvise eventuelle trender i endringer fra 2004. Fem overvåkingsflater ble analysert i 2019. Fire av disse ligger langs en tilnærmet horisontal linje fra Svanvik og vestover, mens den fjerde flata ligger i Jarfjorden nord for Nikel. Analysene viser ei langt større dekning av makrolav i 2019 enn i 2004 på alle de tre overvåkingsflatene hvor lav på bjørk overvåkes. Økninga er svært betydelig, hhv. 194 %, 287 % og 352 %. På de to flatene hvor lav på furu overvåkes, som begge ligger nær Nikel, var det i 1995 og 2004 ikke registrert noen lav på stammene. I 2019 ble det registrert noen få individer, noe som ledet til ei dekning på 1,5 %. Konsentrasjonene av kobber og nikkel i etasjemose og reinlav var i 2019 to til tre ganger høyere enn i 2004. Konsentrasjonene var høyest på overvåkingsflata nærmest Nikel. Også flata i Jar-fjorden hadde i 2019 høye konsentrasjoner til tross for betydelig avstand til Nikel. Tre årganger med furunåler (dvs. fra 2017 til 2019) viste høyere konsentrasjoner med økende alder. Konsentrasjonen av bly viste omtrent det samme geografiske mønsteret som nikkel og kobber. Konsentrasjonen er imidlertid mye lavere for bly enn for de to andre tungmetallene. Overvåkinga av avsetning av svoveldioksid og tungmetaller, som rapportert årlig av Norsk institutt for luftforskning (NILU), viser en nedadgående trend for svoveldioksid og en økende trend for tungmetaller. Ei rådende vindretning fra sør om vinteren fører imidlertid til at Jarfjordenområdet får store avsetninger av forurensning vinterstid. Tungmetallanalysene fra biologisk materiale samsvarer derfor godt med NILUs overvåkingsresultater. Høye konsentrasjoner i furunåler viser at det også de siste tre årene har vært betydelig avsetning av tungmetaller. Økninga i lavdekning tolker vi som en respons til reduserte utslipp av svoveldioksid. Disse boreale treboende lavene er generelt mer sensitive til svoveldioksid enn til tungmetaller, men fortsetter akkumuleringa av tungmetaller vil det med tida kunne reversere den registrerte økende trenden for lavdekket på trær.
- Published
- 2020
87. STUDI PENURUNAN KONSENTRASI NIKEL DAN TEMBAGA PADA LIMBAH CAIR ELEKTROPLATING DENGAN METODE ELEKTROKOAGULASI
- Author
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Rachmanita Nofitasari, Ganjar Samudro, and Junaidi
- Subjects
elektrokoagulasi ,nikel ,tembaga ,Environmental technology. Sanitary engineering ,TD1-1066 - Abstract
Limbah cair industri elektroplating mengandung logam berat yang berbahaya sehingga pengolahan terhadap limbah hasil elektroplating agar dapat diminimalisir dampaknya terhadap lingkungan.Sebagian besar mengolah air limbah mereka berdasarkan coagulantion-floculantion sistem. Hal ini nyaman dalam pengolahan biaya dan jumlah besar lumpur mengakibatkan, terutama untuk yang di industri berbasis logam. Penelitian ini dilakukan untuk menemukan teknologi alternatif baru berdasarkan elektrokoagulasi dan flotasi. Percobaan dilakukan secara batch 1 liter untuk 120 menit, arus searah dari 5 A dan tegangan 3 V pada densitas arus 40, 50, 60, dan 70 mA/cm2 dan Aluminium jenis elektroda dan Iron. From percobaan dapat diperoleh nilai efficiency elektrokoagulasi dari contaminan Ni adalah 95% dan Cu adalah 98% pada kepadatan arus 70mA/cm2 dan waktu procees dari 120 menit.
- Published
- 2012
88. Nikel ile Kirlenmiş Toprakların Fitoekstraksiyonu için Transgenik ve Transgenik Olmayan Tütün Bitkisinin Karşılaştırmalı Değerlendirilmesi.
- Author
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DAGHAN, Hatice and KOLELI, Nurcan
- Abstract
Copyright of Ekoloji Dergisi is the property of Ekoloji Dergisi and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2012
- Full Text
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89. Cisplatin delivery from nickel supported Al2O3 powders: characterization with swelling and mutagenity tests.
- Author
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Yalçın, Emine, Şengül, Ümit, özdemir, Gonca, and Çavuşoğlu, Kültiğin
- Subjects
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CISPLATIN , *ALUMINUM oxide , *NICKEL , *FOURIER transform infrared spectroscopy , *SPECTROPHOTOMETRY - Abstract
Objective: In this study cisplatin release profile of Al2O3 powders with nickel phase supportion was investigated. Swelling property, mutagenity test and FTIR analysis were achieved for characterization of powders. Methods: Different formulations of nickel supported Al2O3 powders were synthesized for cisplatin release studies. Swelling ratio, Fourier transform infrared spectroscopy spectrum and Ames test were investigated for the characterization of Al2O3 and nickel supported Al2O3 powders. In vitro cisplatin release were studied in physiological saline solution and the amount of released cisplatin was determined with spectrophotometric analysis. Results: The powders showed a swelling degree between 46-86% and swelling ratio increased with increasing Ni phase. This behaviour has been explained on the basis of the softer character of nickel phase. And the results of Ames test indicate that all powder formulations are non-mutagenic. The release of cisplatin was studied as a function of time and all formulations showed non-Fickian diffusion with n value ranged between 0.55 and 0.69. Conclusion: The nickel supported Al2O3 formulations designed in this study, shows great promise as a cisplatin release material due to the favorable characteristics identified in these studies. [ABSTRACT FROM AUTHOR]
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- 2012
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90. Determination of influence of heavy metals on structure of benthic macroinvertebrate assemblages in low order Mediterranean streams by using canonical correspondence analysis.
- Author
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Kazanci, Nilgün and Dügel, Muzaffer
- Subjects
HEAVY metals & the environment ,RIVER ecology ,GROUNDFISHES ,AQUATIC habitats ,NATURE reserves ,WATER quality ,CORRESPONDENCE analysis (Communications) ,ZINC ,CADMIUM - Abstract
Copyright of Review of Hydrobiology is the property of NK Yayincilik Egitim Hizmetleri and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
- Published
- 2010
91. Induction of an Autoimmune Thyroid Disease with Nickel Chloride in Brown Norway Rats.
- Author
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Al-Mogairen, Sultan
- Subjects
- *
AUTOIMMUNE diseases , *THYROID gland , *CHLORIDES , *AUTOANTIBODIES , *LABORATORY rats , *SERUM albumin , *NICKEL - Abstract
Objective: Hazards caused by nickel exposure, due to its direct and autoimmune reaction, are a growing problem. The aim of this study is to explore whether nickel will induce autoimmune thyroid disease in immunosensitive rats. Materials and Methods: In this study, twelve Brown Norway rats were selected from our previous study (Almogairen et al, Lupus 2009 April). The rats were sacrificed after the exposure to nickel and then thyroidectomized. Histological studies of the thyroid were performed in the group of six rats positively responding to nickel and were compared with the equal number of rats in the autoantibody-negative control group. Results: Histologically, epithelial follicular proliferation in the thyroid gland was significant in the subcutaneous nickel group (p=0.05). Conclusions: When correlating the above results with serum ANA response of the same rats, it might be concluded that nickel chloride might induce autoimmune thyroid disease in immnosensitive rats. [ABSTRACT FROM AUTHOR]
- Published
- 2009
92. Nickel Hyperaccumulation in Bornmuellera kiyakıı Aytaç & Aksoy and Associated Plants of the Brassicaceae from Kizildag (Derebucak, Konya-Turkey).
- Author
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Reeves, Roger D., Adigüzel, Nezaket, and Baker, Alan J. M.
- Subjects
- *
BRASSICACEAE , *ALYSSUM , *ULTRABASIC rocks , *PLANTS - Abstract
Recent exploration of an area of ultramafic geology in south-western Turkey led to the discovery and description of a new species, Bornmuellera kiyakii Aytaç & Aksoy (Brassicaceae). This was of particular interest to us because of the earlier discovery of nickel hyperaccumulation (Ni concentrations exceeding 0.1% of plant dry weight) in 6 other taxa in this small genus from Albania, Greece, and Turkey. We report herein that B. kiyakii is also a Ni hyperaccumulator, based on a population near Çamlik that showed a mean Ni concentration exceeding 8000 mg kg-1 of dried leaf material. Several other members of the Brassicaceae at the same site-species of Alyssum L., Pseudosempervivum (Boiss.) Grossh. (formerly in Cochlearia L.) and Thlaspi L.-also act as Ni hyperaccumulators. [ABSTRACT FROM AUTHOR]
- Published
- 2009
93. The Nickel Hyperaccumulating Plants of the Serpentines of Turkey and Adjacent Areas: A Review with New Data.
- Author
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Reeves, Roger D. and Adigüzel, Nezaket
- Subjects
- *
SERPENTINE in soils , *HYPERACCUMULATOR plants , *NICKEL , *PHYTOREMEDIATION , *ALYSSUM , *THLASPI , *CENTAUREA - Abstract
Botanical exploration of serpentine soils in Turkey and neighbouring countries has shown that the region includes at least 59 taxa capable of hyperaccumulating nickel (to >0.1% of plant dry weight). These hyperaccumulators belong to the Brassicaceae (Aethionema R.Br., Alyssum L., Bornmuellera Hausskn., Pseudosempervivum (Boiss.) Grossh. (Cochlearia L.), and Thlaspi L. s.l.) and the Asteraceae (Centaurea L.). We review present knowledge of the hyperaccumulators and provide additional data recently obtained. Some species are serpentine-endemic and invariably Ni hyperaccumulating; others show more complex distribution and Ni-accumulating behaviour. Many are good subjects for biochemical studies on the Ni-accumulation and sequestering processes. There is potential in Turkey for exploiting Ni hyperaccumulation for remediation of Ni-contaminated soils ('phytoremediation') and for economical selective extraction of metal compounds by cropping hyperaccumulators ('phytomining'). However, there is a need for further exploration of the natural resources and some further taxonomic work by traditional and DNA methods. Attention must be paid to conservation issues, as some of the relevant species are quite rare. [ABSTRACT FROM AUTHOR]
- Published
- 2008
94. Does Impact of Point Polluters Affect Growth and Reproduction of Herbaceous Plants?
- Author
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Kozlov, Mikhail and Zvereva, Elena
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PLANT development ,MINES & mineral resources & the environment ,HEAVY metals ,SOIL composition ,ALUMINUM smelting ,COPPER smelting ,IRON smelting ,TOLERATION - Abstract
Investigation of nine herbaceous species collected around five polluters in northwestern Russia (nickel–copper smelters at Monchegorsk and Nikel, ore-roasting factory at Zapolyarnyy, aluminium smelter in Kandalaksha, and iron pellet plant at Kostomuksha) demonstrated that effects of pollution on plant growth were rarely significant in individual analyses. However, meta-analysis revealed decrease in plant size, in terms of height and leaf length; simultaneous increase in the number of leaves and flowers/inflorescences may compensate for this decline, thus the biomass of aboveground plant parts did not change. This result contrasts numerous experimental studies that generally demonstrate adverse effects of various pollutants on growth and reproduction of herbaceous plants, hinting that the effects detected in short-term experiments are of limited value for predicting performance of plant individuals surviving in polluted ecosystems. Changes in growth and reproduction of plants persisting under chronic pollution are minor presumably due to development of pollution tolerance and adaptation to altered environmental conditions. [ABSTRACT FROM AUTHOR]
- Published
- 2007
- Full Text
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95. EFEK PENGADUKAN SAAT PELAPISAN TEMBAGA PADA ALUMUNIUM TERHADAP LAJU KOROSI
- Author
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null Syamsuir, null Hamzah Fajar, null Kurniawan Widodo, and null Sopiyan
- Subjects
Magnetic stirrer ,Nikel ,Tembaga ,Elektroplating ,Alumunium - Abstract
Penggunaan alumunium yang dilapis tembaga akan lebih ekonomis jika dibandingkan dengan pengunaan tembaga pejal. Saat ini penggunaan tembaga dalam dunia medis banyak dibutuhkan,karena dapat berfungsi sebagai anti bakteri (oligodinamik). Dalam penelitian ini akan dilakukan proses elektroplating dengan pelapis tembaga di atas substrat alumunium. Pada proses elektroplating tersebut akan ditambahkan juga proses pengadukan sebesar 300 rpm. Hal ini dilakukan agar distribusi ion merata. Pada proses elektroplating tembaga menggunakan kuat arus 20 mA,voltase 1,2 V selama 30 menit dengan komposisi larutan CuSO4 220gr/L dan H2SO4 20ml/L. Bedasarkan hasil uji korosi yang di dapat dengan diaduk maka laju korosinya meningkat. Laju korosi terendah pada substrat yang telah di lapisi dengan tembaga tanpa pengadukan. Terlihat pergeseran potensial korosi (Ekorosi) sekitar ±0,4V ketika dilapisi dengan tembaga, baik dengan pengadukan maupun tidak. Permukaan lapisan tembaga terlihat lebih seragam ketika dilakukan pengadukan saat proses elektroplating. Kata kunci : Elektroplating,Tembaga, Nikel, Alumunium, Magnetic stirrer
- Published
- 2019
- Full Text
- View/download PDF
96. Improving the anode catalyst with TiO2 supported for direct methanol fuel cells
- Author
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Ülgen, Asaf Tolga, Döner, Ali, and Haskul, Mehmet
- Subjects
Elektrokimyasal çöktürme ,Electrodeposition ,TiO2-nanotüp ,Nikel ,Nickel ,TiO2-nanotupe ,Fuel cells ,Yakıt hücreleri - Abstract
Metanollü yakıt hücreleri için çok duvarlı ve kaliteli TiO2 nano-tüpler (TiO2-NTs) katalizör desteği olarak hazırlanmıştır. Sıralı TiO2-NTs hazırlandıktan sonra yüzeyine küçük miktarlarda nikel (Ni) nanotanecikleri (TiO2-NTs-Ni) elektrokimyasal olarak çöktürülmüştür. Bu şekilde hazırlanan anot katalizörlerinin yüzey ve kristal yapısı sırasıyla taramalı elektron mikroskobu (SEM), dönüşümlü voltametri (CV) ve X-ışını kırınımı (XRD) ile karakterize edilmiştir. Hazırlanan TiO2-NTs-Ni anot katalizörlerinin metanol oksidasyonu için katalitik aktiviteleri 1 M KOH içeren 1 M Metanol çözeltisinde CV ve zamanla kararlılıkları ve dayanıklıkları kronoamperometri (CA) tekniği ile araştırılmıştır. Elde edilen sonuçlara göre TiO2-NTs metanollü ortamda aktivite göstermemiş bununla beraber yüzeyi az miktarda Ni ile kaplanması metanol oksidasyonunu arttırmıştır. Katalizör yüzeyindeki Ni miktarı arttıkça oksidasyon hızı artmaktadır. CV tarama hızı arttıkça oksidasyon pik akımlarında artış gözlemlenmiştir. CA sonuçlarına göre hazırlanan katalizörler bir saat boyunca çalışılan ortamda kararlı ve dayanıklı yapı sergilemiştir. Hazırlanan TiO2-NTs-Ni metanollü yakıt hücreleri için etkin bir anot katalizörü olarak kullanılabilir. Multi walled and quality TiO2 nano-tubes (TiO2-NTs) as catalyst support were prepared. Low amounts of nickel (Ni) nano-particles were electrodeposited on TiO2-NTs surface after the preparation of multi walled TiO2-NTs. Surface structure and crystallinity of prepared anode catalysts were characterized by scanning electron microscopy (SEM), cyclic voltammetry (CV) and X-ray diffraction (XRD), respectively. Catalytic activities of prepared TiO2-NTs-Ni anode catalysts and stability and durability with time were investigated with CV and chronoamperometry (CA) in 1 M KOH containing 1 M methanol solution. Obtained results showed that the TiO2-NTs had no activity in methanol, however deposition of low amount of Ni enhanced the methanol oxidation. Oxidation rate is increasing with increasing of amount of Ni on the surface. It was observed that oxidation peak current increased with increasing scan rate of CV. According to results of CA, prepared catalysts exhibited the stable state in the operation condition by one hour. The prepared TiO2-NTs-Ni can be used efficiently as anode catalyst in the methanol fuel cells. Bingöl Üniversitesi Merkezi Laboratuvar Uygulama ve Araştırma Merkezi
- Published
- 2019
97. Metal içerikli silika mikro kürelerin sentezi, karakterizasyonu ve aktivitelerinin incelenmesi
- Author
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Gündüz Meriç, Gamze, Değirmenci, Levent, Kaytakoğlu, Süleyman, and Kimya Mühendisliği Ana Bilim Dalı
- Subjects
Hidrojen Üretimi ,Nikel ,Dry Reforming of Methane ,Hydrogen energy ,Nickel- Iron ,Hydrogen Production ,Nickel-Palladium ,Chemical Engineering ,Renewable energy resources ,Kimya Mühendisliği ,Metanın Kuru Reformlanması ,Catalytic reaction ,Nikel- Kobalt ,Nickel ,Microsphere - Catalys ,Chemical reaction engineering ,Nikel-Demir ,Nickel- Cobalt ,Mikro Küre Katalizör ,Nikel-Paladyum - Abstract
Anadolu Üniversitesi ve Bilecik Şeyh Edebali Üniversitesi tarafından ortak yürütülen program. Bu çalışmada, metanın kuru reformlanma reaksiyonu ile kullanılabilir kimyasal ürün olarak hidrojen ve karbonmonoksit eldesi için aktif, seçici, sürdürülebilir, reaksiyon sonucunda kok oluşumuna duyarlı katalizörler geliştirilmesi amaçlanmıştır. Bu amaçla monometalik Ni, bimetalik Ni-Co, Ni-Fe ve Ni-Pd yüklü silika mikro küreler sol-jel mikroenkapsülasyon ve sol-jel mikroenkapsülasyon-emdirme sentez yöntemleriyle hazırlanmışlardır. Farklı Ni yüklü mono metalik silika mikro küre katalizörlerin aktivite ve kararlılık sonuçlarına bakılarak toplamda % 5 Ni-M (M:Co, Fe, Pd) olacak şekilde belirlenen katalizörler eşit Ni- M, düşük Ni- yüksek M ve yüksek Ni- düşük M olacak şekilde (1Ni-1M, 1Ni-2M, 2Ni-1M ve 4Ni-1M) sentezlenmişlerdir. Hazırlanan katalizörlerin fiziksel ve yapısal özelliklerinin belirlenebilmesi amacıyla katalizörlere ICP-OES, N2 adsorpsiyon-desorpsiyon, XRD ve SEM analizleri gerçekleştirilmiştir. Metanın kuru reformlanma reaksiyonu için, çalışılacak uygun reaksiyon sıcaklığı 750˚C ve besleme oranı CH4/CO2/N2: 1/1/1 belirlenerek deneyler yapılmıştır. Toplamda kütlece % 5 metal içeren bimetalik mikro küre katalizörler varlığında gerçekleştirilen katalitik aktivite deneylerinde en yüksek (% 88- metan) aktiviteyi ve 0,92 H2/CO oranını sol-jel mikroenkapsülasyon- emdirme yöntemiyle sentezlenen 1Ni-2Pd yüklü bimetalik silika mikro küre katalizörü göstermiştir. Ni-Pd yüklü bimetalik silika mikro kürelerin yanı sıra Ni-Co yüklü bimetalik silika mikro kürelerin de aktivite testlerinden bu reaksiyon için oldukça aktif oldukları ve kararlılıklarını 3 saat boyunca korudukları tespit edilmiştir. Katalizörlerin reaksiyon sonrası yapısal ve fiziksel değişimlerinin belirlenebilmesi amacıyla SEM, XRD, TGA ve Raman spektroskopisi analizleri gerçekleştirilmiştir. Ni-Fe yüklü silika mikro küre katalizörlerde reaksiyon sonrası kok oluşumu tespit edilmiştir. Ni-Co ve Ni-Pd yüklü mikro kürelerin yapılarında kok oluşumu tespit edilmemiştir. En yüksek aktiviteyi ve H2/CO oranını sol-jel mikroenkapsülasyon- emdirme yöntemi ile sentezlenen Ni-Pd ve Ni-Co yüklü bimetalik silika mikro küre katalizörler vermiştir. 12 saat uzun ömürlülük aktivite testlerinde de bu katalizörler için kok oluşumu ve aktivite kaybı tespit edilmemiştir. In this study, it is aimed to develop coke formation sensitive catalysts as a result of active, selective, sustainable, reaction to hydrogen and carbon monoxide as chemical product which can be used with dry reforming of methane reaction. For this purpose, monometallic Ni, bimetallic Ni-Co, Ni-Fe and Ni-Pd silica microspheres were prepared by sol-gel microencapsulation and sol-gel microencapsulation-impregnation synthesis methods. The catalysts determined to be 5% Ni-M (M: Co, Fe, Pd) will be equal Ni-M, low Ni-high M and high Ni-low M (1Ni-1M, 1Ni-2M, 2Ni-1M and 4Ni-1M) based on the activity and stability results of different Ni-based mono metallic silica microsphere catalysts. In order to determine the physical and structural properties of the prepared catalysts, ICP-OES, N2 adsorption-desorption, XRD and SEM analyzes were performed. For the dry reforming of methane reaction, the appropriate reaction temperature was determined as 750 ˚C and the feed rate was determined as CH4/CO2/N2: 1/1/1. The effect of determined optimum conditions on the catalytic activity of catalysts was investigated. In the catalytic activity experiments carried out in the presence of total 5% metal-containing bimetallic microsphere catalysts, 1Ni-2Pd sol-gel microencapsulation-impregnation bimetallic silica microspheric catalyst showed the maximum activity (88 % methane) and maximum H2/CO ratio (0,92). In addition to the Ni-Pd loaded bimetallic silica microspheres, Ni-Co loaded bimetallic silica microspheres were found to be very active for this reaction from activity tests and were stable for 3 hours. SEM, XRD, TGA and Raman spectroscopy analyzes were performed in order to determine the structural and physical changes of the catalysts after the reaction. Coke formation was observed in the Ni-Fe bimetallic silica microsphere catalysts after the reaction. Coke formation was not detected in the structures of Ni-Co and Ni-Pd bimetallic microspheres. Ni-Pd and Ni-Co bimetallic silica microspheres showed the highest activity, stability and H2/CO ratio. Coke formation and activity loss were not detected for these catalysts during 12 hours long life activity tests.
- Published
- 2019
98. Düşük karbonlu çeliğin yüzey özelliklerinin grafen içerikli kompozit kaplama ile iyileştirilmesi
- Author
-
Aydin, Kemal, Mindivan, Harun, and Makine ve İmalat Mühendisliği Ana Bilim Dalı
- Subjects
Coating ,Grafen ,Kaplama ,Electrodeposition ,Nikel ,Nickel ,Mechanical Engineering ,Elektrolitik kaplama ,Composite ,Makine Mühendisliği ,Graphene ,Kompozit - Abstract
Kompozit kaplamalar üstün özelliklerinden dolayı endüstriyel ve teknolojik alanlarda geniş uygulama alanlarına sahiptir. Mekanik, otomotiv, kâğıt mili, gıda ve imalat endüstrisinde kullanılan ve kullanım alanına göre kalınlığı nm seviyesinden başlayan ve mm seviyesine kadar kalınlığa ulaşan kaplama tabakalarına ihtiyaç duyulmaktadır. Bahsi geçen uygulamalar için üretilecek kaplamalardan üstün mekanik özellikler, yüksek aşınma direnci, yüksek termal kararlılık gibi özellikler istenmektedir. Kompozit kaplamalar bu tür uygulamalar için iyi bir adaydır. Bu çalışmada St37 çelik altlık üzerine Nikel ve Nikel/Grafen kompozit kaplama tabakaları Doğru Akım (DC), Pulse Akım (PC) ve Pulse Reverse Akım (PRC) olmak üzere üç farklı akım türünde ve farklı grafen miktarlarına bağlı olarak Watt tipi banyo kullanılarak üretilmiştir. Akım yoğunluğunun farklı akım türlerinde üretilen kaplamaların özelliklerine etkileri incelenmiştir. Üretilen kaplamalar taramalı elektron mikroskobu (SEM) ve X-ışınları difraksiyonu (XRD) metodu kullanılarak karakterize edilmiştir. Akım türünün sertlik ve aşınma davranışına etkileri incelenmiştir. Composite coatings have a wide range of applications in industrial and technological fields due to their superior properties. There is a need for coating layers whose use in mechanical, automative, paper shaft, food and manufacturing industry, and thickness starts at nm and reaches up to mm depending on the area of use. Features such as superior mechanical properties, high wear resistance, high thermal stability are required from the coatings to be produced for said applications. Composite coatings are a good candidate for such applications. In this study, Nickel and Nickel / Graphene composite coating layers on St37 steel substrate were produced by using Watt type bath in three different types of current such as Direct Current (DC), Pulse Current (PC) and Pulse Reverse Current (PRC) depending on different amounts of graphene. The effects of current density on the properties of coatings produced in different current types were investigated. Produced coatings were characterized by scanning electron microscopy (SEM) and X-ray diffraction (XRD) method. The effects of current type on hardness and wear behaviour were investigated Bilecik Şeyh Edebali Üniversitesi Bilimsel Araştırma Projesi - BAP - 2018-01.BŞEÜ.03-03. Bilecik Seyh Edebali University Scientific Research Project - BAP - 2018-01.BŞEÜ.03-03.
- Published
- 2019
99. Removal of nickel and kadmium in the water by bentonite
- Author
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Çetin, Feyza Nahide, Güllü, Özlem, and Fen Bilimler Enstitüsü
- Subjects
Ağır Metal Giderimi ,Bentonit ,Nikel ,Nickel ,Bentonite ,Heavy Metal Removal ,Adsorption ,Kadmiyum ,Adsorpsiyon ,Cadmium - Abstract
Çalışma kapsamında, bentonit kullanılarak sulu çözeltilerden adsorpsiyon yöntemiyle nikel ve kadmiyum giderimi incelenmiştir. Optimum giderim koşullarının belirlenmesi amacıyla deneyler her iki metal için gerçekleştirilmiştir. Adsorpsiyon mekanizmasını etkileyen adsorban dozajı, temas süresi, sıcaklık ve adsorban boyutu parametrelerinin adsorpsiyon verimine etkileri araştırılmıştır. 0,1 mg/L (100 ppb) başlangıç derişimi için en uygun adsorban dozajı nikel giderimi için 3 g/25 mL ve kadmiyum için 1 g/25 mL olarak belirlenmiştir. Nikel ve Kadmiyum gideriminde 30 dakikada adsorpsiyon dengesine ulaşılmıştır. 40 °C’de her iki ağır metal içinde maksimum adsorpsiyon verimi elde edilmiştir. Adsorban boyutuyla ilgili Nikel gideriminde 0,5 mm boyuttaki bentonitle, kadmiyum giderimi içinse >2 mm boyutta en yüksek verim elde edilmiştir. Sürecin Langmuir izoterm modeline uygun olduğu tespit edilmiştir. Sonuç olarak, bentonitin sulu çözeltilerden nikel ve kadmiyum iyonlarının giderilmesinde etkili ve ekonomik bir adsorban olarak kullanılabileceği yargısına varılmıştır., The preparation of the study was carried out to determine the removal of nickel and cadmium from the aqueous solutions of bentonite treatment by adsorption method. The experiments, where optimum removal conditions were presented, were carried out for two metals. The adsorption efficiency of adsorbent dosage, contact time, temperature and adsorbent size parameters were investigated. For the initial concentration of 0,1 mg / L (100 ppb), the optimal adsorbent dosage is 3 g / 25 mL for nickel removal and 1 g / 25 mL for cadmium. Adsorption equilibrium was reached in 30 chambers for nickel and cadmium removal. Maximum adsorption efficiency in two heavy metals at 40 ° C was achieved. The highest yield was obtained with 0.5 mm bentonite in terms of adsorbent size and> 2 mm in cadmium removal. The process was found to be in accordance with Langmuir isotherm model. As a result, it has been concluded that bentonite can be used as an effective and economical adsorbent to remove nickel and cadmium ions from aqueous solutions.
- Published
- 2019
100. Production of paraffin, metal dust-filled epoxy resin and determination of radiation neutron shielding parameters
- Author
-
Topal, Mehmet, Han, İbrahim, Alım, Bünyamin, Fizik Anabilim Dalı, and Fen Bilimleri Enstitüsü
- Subjects
Soğurganlık ,Zırhlama ,Nikel ,Niyobyum ,Nükleer Mühendislik ,Nuclear Engineering ,Bor Karbür ,Epoksi ,Alüminyum ,Bor ,Krom ,Parafin ,Nötron ,Monte Carlo - Abstract
Parafinin nötron ve gama parçacıklarını iyi soğuran bir materyal olduğu bilinir. Bu çalışmada amaç parafine belli oranlarda metal tozu karıştırarak nötronları en iyi soğuran zırhlama malzemesini elde etmektir. Monte Carlo Simülasyon tekniği kullanılarak Parafin, Epoksi, Alüminyum, Bor Karbür, Niyobyum, Bor, Krom, Nikel metal tozları ile parafin örnekleri oluşturuldu. Bazı materyaller 4,5 MeV'lik nötronlarla ayrı ayrı ışınlanarak nötron soğurganlıkları gözlemlendi. Metal tozu dolgulu materyallerin diğer materyallerden nötronları soğurmada daha uygun olduğu belirlendi., It is known that paraffin is a material that absorbs neutron and gamma particles. The aim of this study is to obtain the armor material that absorbs neutrons by mixing metal powder with certain proportions of paraffine. Paraffin, epoxy, aluminum, Boron Carbide, niobium, boron, chromium, nickel metal powders and paraffin samples were created using Monte Carlo simulation technique. Some materials were irradiated separately with 4.5 Mav neutrons, and neutron attenuations were observed. It was determined that metal powder-filled materials were more suitable for absorbing neutrons than other materials.
- Published
- 2019
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