38 results on '"Nikel"'
Search Results
2. Probabilistic Simulation and Sensitivity of Health Risks from Nickel and Cobalt Deposition Around the Mine.
- Author
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Wulandari, Sherly, Mallongi, Anwar, Budimawan, Birawida, Agus Bintara, Noor, Nur Nasry, and Maidin, M. Alimin
- Subjects
- *
SCIENCE databases , *HEAVY metal toxicology , *HEAVY metals , *ANALYSIS of heavy metals , *MONTE Carlo method - Abstract
Background: Mining activities can produce large amounts of heavy metals that are discharged uncontrollably, causing widespread ecosystem pollution. Heavy metal pollution is a serious problem, as heavy metals are toxic and non-degradable, polluting air, water and soil. Although some heavy metals are considered essential for normal physiological functions, concentrations that exceed the prescribed limits can have negative impacts on human health and biota. Exposure to heavy metals can cause toxicity to various tissues, organs and systems such as circulatory, respiratory, endocrine, immune, nervous, urinary and reproductive systems. Due to the differences in toxicity of heavy metals, risk assessment is very important in environmental management. Objective: To describe the probabilistic simulation and sensitivity of health risks due to Nickel and Cobalt deposition around the mine using monte carlo simulation. Methods: The method used in this study was literature review. Data collection was done through searching online databases such as: Pubmed and Science Direct. The keywords used in the article search were "Heavy Metal Toxicity", "Heavy Metal Effects", "Heavy metal risk analysis" and "Monte Carlo Simulation". Inclusion criteria were quantitative or qualitative research, target population was heavy metals Nickel and Cobalt, published in the last 10 years (2013-2023) articles in English and articles in original, fulltext and open access. Exclusion criteria are articles that are not relevant to the topic of discussion. Results: 14 articles were found, of which 3 articles on diseases or health problems caused by nickel, 3 articles on nickel risk analysis, 5 articles on diseases or health problems caused by cobalt, 3 articles on cobalt risk analysis. Conclusion: The environment around the mine shows a high level of toxicity, caused by the presence of heavy metals. This can result in serious environmental pollution and pose a great threat to human health. Chronic exposure to heavy metals can cause various health problems, such as mutagenesis, carcinogenesis, teratogenesis, deformation and organ damage. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
3. Production and Investigation of Properties of Nickel Particle Reinforced AA5083 Matrix Metal-Metal Composites.
- Author
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Özkaya, Serdar
- Subjects
- *
METALLIC composites , *NICKEL , *ALUMINUM alloys , *POWDER metallurgy , *BALL mills - Abstract
The aim of this study is to develop metal-metal composites reinforced with nickel powder using an AA5083 aluminium alloy matrix by powder metallurgy methods and to investigate their properties. In order to analyse the influence of different amounts of nickel particles on the AA5083-Ni composite, specimens were prepared by incorporating nickel at 5%, 10% and 15% by weight. To achieve a uniform distribution of nickel particles, the matrix and composite powders were mixed in ball mills for five hours. These powders were then hot pressed at 500°C under a pressure of 500 MPa for two hours in an argon gas atmosphere to produce the samples. These samples were then tested for microstructure, hardness, density, tensile properties and corrosion behaviour to assess the effect of varying nickel content on the AA5083-Ni metal-metal composites. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
4. Pemanfaatan Sludge Smelter Nikel Sebagai Material Dasar Pembuatan Paving Block
- Author
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Yusup Hi Sergi, Mufti Amir Sultan, and Muhammad Amin
- Subjects
kuat tekan ,nikel ,paving block ,penyerapan ,sludge ,Highway engineering. Roads and pavements ,TE1-450 ,Engineering (General). Civil engineering (General) ,TA1-2040 - Abstract
Smelting atau peleburan adalah proses mengekstraksi bijih logam murni dari dalam tanah. Dengan kata lain, ini adalah proses pemisahan logam murni dari bijih yang mengandungnya. Untuk mengekstraksi logam, bijih dipanaskan hingga suhu tinggi (di atas titik lelehnya). Untuk proses ini digunakan smelter yang dalam prosesnya akan menghasilkan limbah cair dan limbah padat (sludge). Sludge tersebut biasanya digunakan sebagai penutup lubang bekas tambang. Sludge digunakan sebagai material dasar pembentuk paving block untuk mengurangi limbah dan peningkatan nilai ekonomis. Pada penelitian ini sludge atau lumpur digunakan sebagai pengganti pasir pada produksi paving block. Kadar sludge yang digunakan adalah 10%, 25% dan 50% menggantikan volume pasir, paving block tanpa sludge sebagai benda uji kontrol. Untuk mengetahui mutu paving block yang dihasilkan dilakukan pengujian kuat tekan dan penyerapan. Hasil penelitian menunjukkan bahwa paving block dengan kadar 10% menghasilkan paving block mutu B, pada kadar 25% dan 50% menghasilkan paving block mutu C.
- Published
- 2024
- Full Text
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5. Protein adsorpsiyon çalışmaları için metal şelat grupları içeren pHEMA-GMA kolon dolgu malzemelerinin hazırlanması.
- Author
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Altınok, Bahar Yılmaz, Keskinateş, Mukaddes, and Bayrakçı, Mevlüt
- Abstract
In this study, new poly(HEMA-co-GMA) or pHEMA-GMA support solid structures were prepared to help protein purification. The surface of the prepared pHEMA-GMA building materials was modified by binding different functional groups such as IDA and NTA. Nickel (Ni II) metal ion was passed through the modified cryogel structures. The monolithic cryogel structure chelated with Ni metal was characterized by SEM and FT-IR. GFP fluorescent protein binding studies of metal chelated cryogel structures were performed using UV-vis and fluorescence spectrophotometry. These cryogels were determined to bind 45% and 75% protein by UV-vis and fluorescence spectrophotometry. And these results were supported by visualization with the SDS PAGE method. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
- View/download PDF
6. Adsorbent Olarak Grafen Oksit Kullanılarak Metal Kaplama Atıksuyunda Nikel (II) Giderimi.
- Author
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AKDEMİR, Andaç and KILIÇ, Funda Cemre
- Abstract
In this study, a series of adsorption studies were carried out for the concentration range of 18.08 - 183.95 mg/L Ni(II) in metal plating industry wastewater using graphene oxide. Under constant stirring speed of 200 rpm, optimum pH=6 and optimum contact time was found to be 90 minutes. Temkin isotherm as a pseudo 2nd order kinetic isotherm was chosen as the appropriate model for adsorption kinetics. The optimum amount of graphene oxide as adsorbent was determined as 0.016 mg/L and accordingly the maximum adsorption capacity was 112.56 mg/g. Considering the literature comparisons; it was concluded that graphene oxide can be used as an improvable adsorbent, however, high efficiency cannot be obtained alone, but high efficiency can be achieved with graphene oxide if it is functionalized. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
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7. Preconcentration of Cu2+, Cr3+, Co2+, and Ni2+ by Solid-Phase Extraction Using a Recently Developed Mixed-Mode Sorbent.
- Author
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ARAL, Hayriye
- Subjects
CHROMIUM ,COBALT ,SOLID phase extraction ,SORBENTS ,SPECTROMETRY - Published
- 2024
- Full Text
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8. INFLUENCE OF MODIFICATION ON PROPERTIES OF ZSM-5 ZEOLITE IN THE REACTION OF TOLUENE ALKYLATION WITH ISOPROPANOL.
- Author
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Voskresensky, L. G., Abdullaeva, N. M., Mammadova, A. Z., Gakhramanov, T. G., and Mamedov, S. E.
- Subjects
ZEOLITES ,ISOPROPYL alcohol ,BIMETALLIC catalysts ,TOLUENE ,NICKEL oxides - Abstract
Bimetallic catalysts based on ZSM-5 zeolite modified with ytterbium and nickel have been prepared. The influence of the concentration of ytterbium (1.7-5.0 wt.%) and nickel (1.0-1.5 wt.%) on the acidic, textural and catalytic properties of the zeolite in the reaction of alkylation of toluene with isopropanol in the temperature range of 300-350℃ was studied. It has been shown that the unmodified zeolite HZSM-5 exhibits low selectivity (54.6-58.2%) for isopropyltoluenes (3-IPT, 4-IPT, and 2-IPT) than the modified catalysts. In addition, the content of the valuable 4-IPT isomer does not exceed 44.2%. Modification of HZSM-5 with ytterbium in an amount of 5.0 wt.% leads to an increase in the selectivity for isopropyltoluenes up to 68.7%, and the selectivity for 4-IPT up to 68.8%. Additional modification of the 3%-Yb-HZSM-5 catalyst with nickel in the amount of 1.0 wt.% prevents the formation of 2-IPT and promotes an increase in the yield of 4-IPT. The modified catalysts were characterized by XPA, BET, BJH, and ammonia TPD. Modification, calcination, and successive treatment of the catalyst with air and hydrogen leads to a dispersed distribution of Yb
2 O3 and metallic nickel oxide nanoparticles in the outer surface and in the pores of the zeolite, which causes a decrease in the specific surface area, total pore volume, and an increase in the fraction of mesopore volume. As a result of the interaction of modifiers with acidic OH groups of the zeolite, the concentration of strong Brønsted acid sites decreases and new, stronger Lewis acid sites form. All this has a decisive effect on the selectivity of 4-IPT formation and the stability of the bimetallic catalyst. The maximum selectivity for 4-IPT on a 3% Yb 1.0% Ni/HZSM-5 bimetallic catalyst is achieved at 3300C and is 71.5% at a toluene conversion of 24.6%. [ABSTRACT FROM AUTHOR]- Published
- 2024
- Full Text
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9. Batasan untuk Keamanan: Analisis Kebijakan Pembatasan Ekspor Nikel Indonesia Menggunakan Pendekatan Poskolonialisme.
- Author
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Anggraeni Purba, Jessica Angelina
- Subjects
NICKEL industry ,POSTCOLONIALISM ,JOB creation ,QUALITATIVE research - Abstract
Copyright of Jurnal Hubungan Internasional is the property of Universitas Airlangga 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
- 2024
- Full Text
- View/download PDF
10. Nikel Partiküller ile Takviye Edilmiş Magnezyum Matrisli Kompozitlerin Üretimi ve Karakterizasyonu.
- Author
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KELEN, Fevzi
- Published
- 2023
- Full Text
- View/download PDF
11. Determination of Some Heavy Metal Concentrations in Serum of Young and Adult Cattle in the Şiran District of Gümüşhane by ICP-MS.
- Author
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ŞİMŞEK, Özkan and DİNÇEL, Güngör Cağdaş
- Subjects
HEAVY metals ,HEALTH risk assessment ,HISTOPATHOLOGY ,OXIDATIVE stress ,PATHOLOGICAL psychology - Abstract
Copyright of Kocatepe Veterinary Journal / Kocatepe Veteriner Dergisi is the property of Afyon Kocatepe University, Faculty of Veterinary Medicine 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
- Full Text
- View/download PDF
12. Endüstriyel Anaerobik Reaktörler İçin Enerji Dönüşümünün Hızlandırılmasına Yönelik Bir Çalışma
- Author
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Halil Şenol and Ayhan Kara
- Subjects
biogas ,industrial reactors ,trace elements ,nickel ,cobalt ,biyogaz ,endüstriyel reaktörler ,iz elementler ,nikel ,kobalt ,Science (General) ,Q1-390 - Abstract
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
- Full Text
- View/download PDF
13. STUDY OF REACTION OF NICKEL (II) WITH 2.4-TYAZOLIDINDYON COMPLEX AND ITS DERIVATIVES.
- Author
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Zalov, A. Z., Kuliyev, K. A., and Aliyeva, K. R.
- Subjects
- *
NICKEL , *COMPLEX compounds , *NICKEL compounds , *OPACITY (Optics) , *ABSORPTION coefficients - Abstract
Spectrophotometric methods are used to study the reaction of the nickel complex with 2.4- tyazolidindico (L) and its derivatives {5- (gasilysiliden) -2,4-tyazolidindio (L1), 5- (2-chlorbenzyliden) -2,4- tyazolidindion (L2), 5-(2-hydroxybenzylide) -2,4-tiazoleader (L3), 5- (4-hydroxybenzylide)-2,4- tyazolidindion(L4),5-(2-Brom-5-methoxybenzyiliden)-2,4-tiazolyidinedion (L5). With a single extraction, the chloroform is extracted by 97.8-98.4 % of the nickel. The study of the dependence of complexation on pH showed that the optimal range of acidity, at which the optical density is maximum and constant, is at pH 2.3- 8.0. The optimal condition for the formation and extraction of the nickel complex of these compounds is (2.0- 2.5) × 10-4 M concentration L. Nickel complexes with L are stable in water and organic solvents and do not decompose for three days, and after extraction for more than a month. The maximum optical density is achieved within 5 minutes. The maximum analytical signal during the complex of nickel L is observed at 470-482 nm/ molar absorption coefficients (1.37-1.61)×104 . The comprehensive form of nickel is Ni2*while the number of protons supplanted by it from one molecule L turned out to be equal to 1. Nickel and its complexes in the organic phase are not polymerized and are in a monomeric form (γ = 1.01-1.07). The proposed method under already established optimal conditions is used to determine Ni (II) in wastewater, bottom deposits, as well as in oil and oil products. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
14. KELARUTAN NIKEL PADA CAMPURAN TANAH BERBAHAN INDUK ULTRABASA DENGAN GAMBUT PADA KONDISI JENUH DAN TIDAK JENUH AIR.
- Author
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Simbolon, David Ricardo, Sumawinata, Basuki, and Djajakirana, Gunawan
- Abstract
Tropical peat with low bulk density affects the ability of peat soil to support plant growth. To improve the bulk density of peat, mineral soil is mixed to peat soil. However, mineral soil sources near peatlands are typically ultrabasic parent material with high nickel (Ni) content up to 5000 ppm. The acidic peat condition and low topography of peatlands may increase the solubility of Ni if in flooding condition. Therefore, mixing soil materials and water treatments are aimed at measuring Ni solubility at pH equilibrium after mixing and extracting using NH4OAc 1.0 N pH 7.0; 4.8; 4.2, HCl 1.0 N; 0.1 N, and H2SO4 1.0 N. The pH equilibrium after mixing soil materials was at pH 5.2-6.1, indicating Ni solubility is shown by the results of NH4OAc 1.0 N pH 7.0 - 4.8 extraction. Within this pH range, the Ni solubility value in the saturation (J) and drying (K) treatments did not differ significantly at a 5% level of significance. However, the Ni solubility with each addition of peat weight differed significantly under the saturated and moist-dried conditions (JK). [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
15. Kalsine Karadeniz midye kabukları kullanılarak kimyasal çöktürmeyle kurşun, nikel ve bakır giderimi.
- Author
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Özcan, Ahmet Can and Gürel, Levent
- Subjects
- *
MYTILIDAE , *COPPER , *PRECIPITATION (Chemistry) , *LEAD , *HEAVY metals , *CALCIUM hydroxide - Abstract
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. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
16. Gördes lateritik cevherlerinden seçimli nikel-kobalt kazanımı için atmosferik liç yöntemi geliştirilmesi.
- Author
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Demirel, Hilal Seda, Uysal, Duygu, Doğan, Özkan Murat, and Uysal, Bekir Zühtü
- Subjects
- *
LIQUID iron , *PHOSPHORIC acid , *ORE-dressing , *LEACHING , *WEATHER , *RAW materials - Abstract
In recent days, studies on battery technology, which has a very popular place and is developing rapidly, continue intensively. Nickel, which is one of the important raw materials of batteries and whose fields of use are expanding gradually thanks to its physical and chemical properties, is widely used in the production of alloys with various metals, turbine production, battery, paint additive and catalyst production. There are approximately 140 million tons of nickel reserves and 7 million tons of cobalt reserves in the world, 60% of which are lateritic and 40% are sulphides. Although the reserve amount is higher, 42% of the nickel production is made of lateritic 58% of the sulphide ores. However, due to the decrease in the amount of sulphide ores over time, studies on developing technically and economically suitable production methods from lateritic ores have been intensified. Industrially, nickel and cobalt are recovered from lateritic ores by pressurized acid leaching. Atmospheric leaching is both cheaper and safer than the pressure leaching method if long leaching time, high acid consumption and selectivity can be solved. In this study, leaching behavior of Gördes lateritic ore mixture of 70% limonite and 30% non-tronite with both sulfuric acid and phosphoric acid was investigated in atmospheric conditions. Selectivity was provided against nickel and cobalt both by pre-heat treatment to the ore and step leaching process. With the using phosphoric acid, passing through the liquid efficiency of iron was reduced by about 80% compared to using sulfuric acid. Nickel and cobalt yields also obtained in high pressure acid leaching were achieved by sequential leaching and leaching of leaching solids. [ABSTRACT FROM AUTHOR]
- Published
- 2023
- Full Text
- View/download PDF
17. Ratlarda Nikel Sülfatın Genotoksisitesine Karşı Likopenin Koruyucu Etkisi.
- Author
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GARİP, Zozan, TEMAMOĞULLARI, Füsun, and KILIÇLE, Pınar AKSU
- Subjects
NICKEL ,EXPERIMENTAL design ,ANIMAL experimentation ,MUTAGENICITY testing ,LYCOPENE ,RATS ,DESCRIPTIVE statistics ,ERYTHROCYTES ,ANIMALS ,BONE marrow examination - Abstract
Copyright of Balikesir Health Sciences Journal / Balıkesir Sağlık Bilimleri Dergisi is the property of Balikesir Health Sciences Journal (BAUN Health Sci J) 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
- 2022
- Full Text
- View/download PDF
18. ANALISIS KARAKTERISTIK FUNGSI ZEOLIT ALAM AKTIF SEBAGAI KATALIS SETELAH DIIMPREGNASI LOGAM NIKEL
- Author
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Rina Novia Yanti, Erliza Hambali, Gustan Pari, and Ani Suryani
- Subjects
katalis ,ftir ,nikel ,xrd ,zaa/ni ,zeolit alam ,Forestry ,SD1-669.5 - Abstract
Catalytic cracking adalah proses konversi dengan memotong rantai karbon molekul minyak menjadi hidrokarbon sederhana. Proses pemutusan rantai hidrokarbon bisa dilakukan dengan cara kimia menggunakan katalis dan gas hidrogen. Jenis katalis yang biasa digunakan dalam industri kimia adalah logam seperti Nikel (Ni), seng (Zn), dan kadmium (Cd). Logam tersebut dapat digunakan sebagai katalis secara langsung, tetapi pada saat proses catalytic cracking akan menyebabkan penggumpalan katalis, sehingga tidak bisa digunakan secara berulang. Oleh karena itu, katalis logam harus diimpregnasi ke dalam bahan pengemban seperti zeolit. Penelitian ini bertujuan mempelajari proses preparasi dan karakterisasi katalis zeolit alam aktif impregnasi logam nikel (ZAA/Ni) yang terdiri atas karakteristikluas permukaan, XRD, dan FTIR serta morfologi untuk mendapatkan katalis yang terbaik. Zeolit yang digunakan dalam penelitian ini adalah zeolit dari Bayah Banten yang sudah diaktifasi. Fungsi katalis sebagai pemutus rantai karbon dapat ditingkatkan dengan adanya pengemban, yaitu logam nikel. Pengembang berperan sebagai tempat tersebarnya inti aktif yang dapat meningkatkan efektifitas katalis, sehingga katalis dapat dipergunakan secara berulang. Hasil penelitian menunjukkan ZAA/Ni, rasio Si/Al yang tertinggi adalah 6,66 yang termasuk katalis intermediate dengan rasio Si/Al = 2 – 10. Luas permukaan katalis terluas adalah pada ZAA/Ni 3 % sebesar 974,44 m2/g, nilai kristalinitas terbesar adalah 70,09%. Zeolit asal Bayah Banten yang sudah diimpregnasi logam nikel dapat digunakan sebagai katalis untuk meningkatkan kualitas (upgrading) bio oil menjadi bahan bakar dengan konsentrasi ZAA/Ni 3%.
- Published
- 2021
- Full Text
- View/download PDF
19. KBH4 hidrolizinde ince film nikel katalizörünü kullanarak hidrojen üretimi ve proses optimizasyonu.
- Author
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Akkuş, Meryem Sena
- 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. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
20. Mikroplastik ve Biyokatı Varlığında Toprakta Nikel Toksisitesinin Belirlenmesi.
- Author
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ULUTUĞ, Fatma Cansu and TOPUZ, Emel
- Subjects
- *
SLUDGE management , *PLASTIC marine debris , *SEWAGE disposal plants , *ION sources , *MICROPLASTICS , *SEWAGE sludge - 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. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
21. Living With Ghosts? Soviet Heritage in the Russian North.
- Author
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Olsen, Bjørnar Julius
- Subjects
- *
CULTURAL property , *WELL-being , *FIELD research - Abstract
Heritage is commonly understood as denoting sites, objects and traditions that are selected and protected for their uniqueness, monumentality, beauty and/or historical and cultural significance. Heritage, thus, is almost by definition something unquestionably valuable and good, and of outmost importance for our wellbeing and identity. This paper takes a different position and asks what happens if we question heritage's status as a selected reserve of desired things and traditions. Based on fieldwork conducted in contemporary settlements in the Russian North, it explores how the role and significance we ascribe heritage may come out radically altered upon facing the unruly legacies of the Soviet past. [ABSTRACT FROM AUTHOR]
- Published
- 2022
- Full Text
- View/download PDF
22. NiN (N=6-55) Kümelerinin Geometrik Büyümesi ile Erime Davranışı İlişkisinin İncelenmesi.
- Author
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Eryürek, Meral
- Subjects
ROOT-mean-squares ,HEAT capacity ,ATOMIC number ,MOLECULAR dynamics ,GEOMETRIC shapes ,CURVES - Abstract
Copyright of Karaelmas Science & Engineering Journal / Karaelmas Fen ve Mühendislik Dergisi is the property of Karaelmas Science & Engineering Journal 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
- 2022
- Full Text
- View/download PDF
23. 38 Atomlu Ni-Pt-Cu Üçlü Nanoalaşımlarının Yapısal ve Dinamik Özellikleri.
- Author
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Yıldırım, Hüseyin and Arslan, Haydar
- Subjects
MOLECULAR shapes ,ROOT-mean-squares ,CANONICAL ensemble ,GLOBAL optimization ,MOLECULAR dynamics - Abstract
Copyright of Karaelmas Science & Engineering Journal / Karaelmas Fen ve Mühendislik Dergisi is the property of Karaelmas Science & Engineering Journal 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
- 2021
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24. Hınıs Metaofiyolitleri İçerisinde Lateritik Cevher ve Kromit Zenginleşmeleri.
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Kaygısız, Beyzade, Değirmenci, Özgür, Kaya, Fuat Uygar, and Gülkaya, Fatih
- Subjects
OPHIOLITES ,MINERALIZATION - 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
- 2024
25. Türkiye'de Kuzey ve Güney Nikel Lateritleri.
- Author
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Sarıkaya, Ahmet
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NICKEL ,METAL industry - 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
- 2024
26. ANALISIS KARAKTERISTIK FUNGSI ZEOLIT ALAM AKTIF SEBAGAI KATALIS SETELAH DIIMPREGNASI LOGAM NIKEL
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Gustan Pari, Ani Suryani, Erliza Hambali, and Rina Yanti Novia
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ftir ,zeolit alam ,nikel ,zaa/ni ,xrd ,General Earth and Planetary Sciences ,katalis ,Forestry ,SD1-669.5 - Abstract
Catalytic cracking adalah proses konversi dengan memotong rantai karbon molekul minyak menjadi hidrokarbon sederhana. Proses pemutusan rantai hidrokarbon bisa dilakukan dengan cara kimia menggunakan katalis dan gas hidrogen. Jenis katalis yang biasa digunakan dalam industri kimia adalah logam seperti Nikel (Ni), seng (Zn), dan kadmium (Cd). Logam tersebut dapat digunakan sebagai katalis secara langsung, tetapi pada saat proses catalytic cracking akan menyebabkan penggumpalan katalis, sehingga tidak bisa digunakan secara berulang. Oleh karena itu, katalis logam harus diimpregnasi ke dalam bahan pengemban seperti zeolit. Penelitian ini bertujuan mempelajari proses preparasi dan karakterisasi katalis zeolit alam aktif impregnasi logam nikel (ZAA/Ni) yang terdiri atas karakteristikluas permukaan, XRD, dan FTIR serta morfologi untuk mendapatkan katalis yang terbaik. Zeolit yang digunakan dalam penelitian ini adalah zeolit dari Bayah Banten yang sudah diaktifasi. Fungsi katalis sebagai pemutus rantai karbon dapat ditingkatkan dengan adanya pengemban, yaitu logam nikel. Pengembang berperan sebagai tempat tersebarnya inti aktif yang dapat meningkatkan efektifitas katalis, sehingga katalis dapat dipergunakan secara berulang. Hasil penelitian menunjukkan ZAA/Ni, rasio Si/Al yang tertinggi adalah 6,66 yang termasuk katalis intermediate dengan rasio Si/Al = 2 – 10. Luas permukaan katalis terluas adalah pada ZAA/Ni 3 % sebesar 974,44 m2/g, nilai kristalinitas terbesar adalah 70,09%. Zeolit asal Bayah Banten yang sudah diimpregnasi logam nikel dapat digunakan sebagai katalis untuk meningkatkan kualitas (upgrading) bio oil menjadi bahan bakar dengan konsentrasi ZAA/Ni 3%.
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- 2021
27. Erratum to 'Hydrogen production and process optimization using thin film nickel catalyst in KBH4 hydrolysis'
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AKKUŞ, Meryem Sena
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Engineering, Chemical ,Potasyum borhidrür ,Hidroliz ,Hidrojen üretimi ,Nikel ,Magnetron saçtırma ,Mühendislik, Kimya - Abstract
Niğde Ömer Halisdemir Üniversitesi Mühendislik Bilimleri Dergisi, “https://doi.org/10.28948/ngumuh.1143291” DOI numaralı araştırma makalesinde yazar tarafından Şekil 2a ve 2b’de sunulan resimlerin sehven hatalı olarak yüklendiği anlaşılmıştır. Yapılan bu hatadan dolayı yazar, okuyuculardan özür dilemektedir. Makalede yer alan hatalı resimlerin giderilmesi amacıyla yapılan bu düzeltme yazısında makaleye ait doğru resimler ve açıklamalar aşağıda sunulmuştur., Nigde Omer Halisdemir University Journal of Engineering Sciences, in the research article with DOI number “https://doi.org/10.28948/ngumuh.1143291”, it was understood that the images presented in Figures 2a and 2b by the author were inadvertently uploaded as incorrect images. The author apologizes to the readers for this mistake. Correct images and explanations of the article are presented below in this correction article, which was made in order to eliminate the faulty pictures in the article.
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- 2022
28. Rekombinant Escherichia coli Hmt1 Suşunun Nikel ve Alüminyuma Karşı Minimum İnhibisyon Konsantrasyonlarının Belirlenmesi
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AKKURT, Şeyma and ALKAN UÇKUN, Aysel
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Engineering ,Nikel ,Alüminyum ,minimum inhibisyon konsantrasyonu ,genetiği değiştirilmiş bakteri ,Atık suların biyolojik arıtımı ,Mühendislik - Abstract
Bu çalışmada, insan metallothionein geninin 1 (hMT1) transferi ile yabanıl E. coli BL21 suşunun Ni+2 ve Al+3 metal iyonlarına karşı direnç kapasitelerini arttırmak amaçlanmıştır. Ayrıca, yabanıl E. coli BL21 ve rekombinant E. coli hMT1 bakteri türlerinin Ni+2 ve Al+3’e karşı direnç kapasiteleri de karşılaştırılmıştır. Yabanıl E. coli BL21 ve rekombinant E. coli hMT1 bakterilerine farklı Ni+2 ve Al+3 konsantrasyonları uygulanarak hücrelerin büyüme potansiyelleri ve minimum inhibisyon konsantrasyonları (MİK) belirlenmiştir. Yabanıl E. coli Jm109 ve rekombinant E. coli hMT1 suşlarının Ni için MİK değerleri sırasıyla 200 mg/L ve 425 mg/L olarak bulunmuştur. Suşların Al MİK değerleri ise sırasıyla 275 mg/L ve 650 mg/L olarak belirlenmiştir. Sonuç olarak, her iki şuşun Ni’ye göre Al’ye daha toleranslı olduğu belirlenmiştir. Ayrıca rekombinant suşun yabanıl suşa göre Ni ve Al toleransının daha yüksek olduğu tespit edilmiştir. Rekombinant E. coli hMT1 suşunun düşük konsantrasyonlarda bile bu metalleri absorbe etmesinin çevrede kullanılabilirliği açısından yabanıl suşa göre daha yararlı olduğu söylenebilir. Bu çalışma, rekombinant E. coli hMT1 bakterisinin Ni ve Al metallerinin biyolojik arıtımında kullanılması için bir ön fikir sağlayabilir.
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- 2022
29. 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
30. 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
31. Endüstriyel Anaerobik Reaktörler İçin Enerji Dönüşümünün Hızlandırılmasına Yönelik Bir Çalışma
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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
32. 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
33. 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
34. 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
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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
35. MIS KUPOROSI SEXI CHIQINDI OQOVA SUVLARIDAN METALLARNI CHO’KTIRUVCHI REAGENTLAR YORDAMIDA AJRATISH
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Xoliqulov D.B., Ibotov B.O., Maxmudova F.M., and Ostonov Sh.Q.
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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
36. 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
37. 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
38. 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
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