26 results on '"Boran, Filiz"'
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2. Tailor-made novel electrospun polycaprolactone/polyethyleneimine fiber membranes for laccase immobilization: An all-in-one material to biodegrade textile dyes and phenolic compounds
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Kolak, Seda, Birhanlı, Emre, Boran, Filiz, Bakar, Büşra, Ulu, Ahmet, Yeşilada, Özfer, and Ateş, Burhan
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- 2023
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3. Synthesis of a novel fluorinated graphene oxide hybrid material based on poly(2,3,4,5,6-pentafluorostyrene) and its use as a filler for thermoplastic polyurethane film
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OKUTAN, Merve, MERT, Humeyra, BORAN, Filiz, ERGÜN, Ayça, and DELİGÖZ, Hüseyin
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- 2022
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4. Design of laccase–metal–organic framework hybrid constructs for biocatalytic removal of textile dyes
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Birhanlı, Emre, Noma, Samir Abbas Ali, Boran, Filiz, Ulu, Ahmet, Yeşilada, Özfer, and Ateş, Burhan
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- 2022
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5. Biochemical and developmental effects of thyroid and anti-thyroid drugs on different early life stages of Xenopus laevis
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Boran, Filiz and Güngördü, Abbas
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- 2021
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6. Encapsulation of CuO nanoparticles inside the channels of the multi-walled carbon nanotubes functionalized with thermal stress
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Boran, Filiz
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- 2021
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7. Aloe vera-based antibacterial porous sponges for wound dressing applications
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Tamahkar, Emel, Özkahraman, Bengi, Özbaş, Zehra, İzbudak, Burçin, Yarimcan, Filiz, Boran, Filiz, and Öztürk, Ayça Bal
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- 2021
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8. Hydrophobic surface modification and characterization of melamine foam
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OKUTAN, MERVE, primary, BORAN, FİLİZ, additional, ERGÜN, AYÇA, additional, KANCA, YUSUF, additional, ÖZKAHRAMAN, BENGİ, additional, and DELİGÖZ, HÜSEYİN, additional
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- 2023
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9. Synthesis optimization of ZrO2 nanostructures for photocatalytic applications
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BORAN, FİLİZ, primary and OKUTAN, MERVE, additional
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- 2023
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10. Treatment of Automotive Paint Wastewater: Photocatalytic degradation of methylene blue using semi-conductive ZrO2.
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Seyrek, Mustafa, Boran, Filiz, and Okutan, Merve
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SEWAGE ,PHOTOCATALYSIS ,METHYLENE blue ,NANOPARTICLES ,BAND gaps - Abstract
Addressing water pollution, particularly in the automotive industry's painting processes, is vital due to its significant environmental impact, and the use of photocatalysis, an environmentally friendly and energy-efficient advanced oxidation method, holds promise for removing non-biodegradable organic dyes from wastewater. In this study, the use of semiconductor ZrO
2 nanoparticles in the photocatalytic degradation of pollutants in wastewater under UV light was investigated. Zeta potential, Brunauer-Emmett-Teller (BET) surface area and UV-Vis absorption spectroscopy analyzes were performed on the ZrO2 nanoparticle synthesized under optimized experimental conditions. ZrO2 nanoparticles synthesized under the optimized experimental conditions exhibited a high specific surface area (51.793 m²/g). ZrO2 nanoparticles had strong absorption in the visible light region, and the energy band gap was estimated to be approximately 3.062 eV. Photocatalytic activity was evaluated by degradation of methylene blue under UV light (366 nm). The effects of parameters such as the amount of catalyst, concentration and pH of the dye solution, the wavelength of the UV light source used (366 and 254 nm) and the type of test environment on the removal efficiency of methylene blue were investigated. ZrO2 nanoparticles showed high degradation efficiency of 91% in a strong alkaline environment, which may be the result of the facilitated formation of -OH radicals due to the increased concentration of hydroxyl ions. [ABSTRACT FROM AUTHOR]- Published
- 2023
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11. LACCASE PRODUCTION BY NEWLY ISOLATED GANODERMA LUCIDUM WITH SOLID STATE FERMENTATION CONDITIONS AND ITS USING FOR DYE DECOLORIZATION
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BORAN, Filiz and YEŞİLADA, Özfer
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Ganoderma lucidum ,Laccase ,Remazol Brilliant Blue R ,Solid state fermentation ,Wheat bran ,Engineering ,Mühendislik ,Lakkaz ,Remazol Parlak Mavi R ,Katı ortam fermentasyonu ,Buğday kepeği - Abstract
Yeni izole edilmiş fungus Ganoderma lucidum' un lakkaz üretim kapasitesi, katı substratlar üzerinde katı ortam fermantasyonu sırasında incelenmiştir. Buğday kepeğinin en etkili katı substrat olduğu tespit edildiğinden, buğday kepeği ortamında çeşitli kültür parametrelerinin ve bazı indükleyicilerin lakkaz üretimine etkisi araştırılmıştır., pH 5.0, 30 °C ve %75 nem içeriği ile buğday kepeği en etkili ortamdı ve 10 mM bakır ilavesi en yüksek lakkaz miktarını destekledi. Cam tava fermentörde 2973±220 U/L lakkaz aktivitesi elde edildi. Ham lakkaz 70 °C'de en yüksek aktiviteyi vermiştir. 60°C'de 6 saat stabildi ve 70°C'de 2 saat boyunca %37 aktiviteyi korudu. Ham lakkaz, 20 dakika içinde Remazol Parlak Mavi R' nin %61 rengini giderdi. Sonuçlar, bu suşun yüksek miktarda lakkaz üretebileceğini ve bakır gibi uygun indükleyicilerin lakkaz üretimini indükleyebileceğini gösterdi. Elde edilen ham lakkaz, tekstil boyası renk giderme uygulamaları için kullanılabilir., Laccase production capacity of newly isolated fungus Ganoderma lucidum was studied during solid state fermentation on solid substrates. Because wheat bran was detected as the most effective solid substrate, effect of various culture parameters and some inducers on laccase production in wheat bran media was investigated. Wheat bran with moisture content of 75%, pH 5.0 and 30 °C was the most effective medium and 10 mM copper addition supported the highest amount of laccase. In glass tray fermenter 2973±220 U/L laccase activity was obtained. Crude laccase gave the highest activity at 70 °C. It was stable at 60°C for 6 hours and retained 37% activity at 70 °C for 2 hours. It decolorized 61% of Remazol Brilliant Blue R within 20 min. Results showed that this strain could produce high amount of laccase and suitable inducer such as copper could induce its laccase production. The crude laccase obtained could be used for textile dye decolorization applications.
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- 2022
12. Synthesis optimization of ZrO2 nanostructures for photocatalytic applications.
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BORAN, Filiz and OKUTAN, Merve
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FOURIER transform infrared spectroscopy , *IRRADIATION , *SEMICONDUCTOR synthesis , *NANOSTRUCTURES , *ELECTRON energy loss spectroscopy , *TRANSMISSION electron microscopy , *X-ray spectroscopy - Abstract
This study aims to optimize the synthesis of semiconductor zirconia (ZrO2) nanoparticles for future photocatalytic applications in degradation of pollutants in wastewater under ultraviolet (UV) light. The synthesis procedure of ZrO2 nanoparticles was optimized by examining the effects of synthesis methods (ultrasound-assisted, hydrothermal method in an autoclave and conventional precipitation), reaction time (2, 6, 10, and 18 h), ambient pH (3, 7, 10, 13), and surfactant type (anionic, cationic, and non-ionic), on the particle size and crystal phase of the nanomaterial. The characterization of the synthesized samples was performed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), energy-dispersive X-ray spectroscopy (EDS), high-contrast transmission electron microscopy (HR-TEM), and transmission electron microscope (TEM) analysis. Consequently, to synthesize ZrO2 nanoparticles with the smallest particle size and monoclinic/tetragonal phase, the experimental conditions were optimized as ultrasound-assisted synthesis method, pH 10, and 6 h reaction time without surfactant. Moreover, percentage yield, particle size, crystallinity, monoclinic and tetragonal volumes of ZrO2 nanostructures synthesized under optimized conditions were determined as 39.40%, approximately 9 nm, 46.77, 79%, and 21%, respectively. It has been determined that the particle sizes can be kept under control by controlling the phase composition of ZrO2 nanostructures by optimizing the synthesis parameters. Structural and morphological characterization results can be correlated to the photocatalytic application, showing the potential of this material for the photodegradation of organic dye pollutants. [ABSTRACT FROM AUTHOR]
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- 2023
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13. Enhancement of dispersion stability of inorganic additives via poly(sodium-4- styrenesulfonate) treatment geared to hydrogel applications
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BORAN, Filiz, primary and OKUTAN, Merve, additional
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- 2021
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14. Nem ve sıcaklık algılama için iletken poli(o-toluidin)/kaolinit kompozitlerinin sentezi ve karakterizasyonu
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BORAN, Filiz, ÇETİNKAYA, Sevil, KARAKIŞLA, Meral, and SAÇAK, Mehmet
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kaolinite ,Mühendislik ,kompozit ,temperature sensor ,sıcaklık sensör ,Poly(o-toluidine),Kaolinite,Composite,Conductive polymer,Temperature sensor,Humidity sensor ,i̇letken polimer ,Engineering ,poli(o-toluidin) ,kaolinit ,lcsh:TA1-2040 ,nem sensör ,conductive polymer ,composite ,humidity sensor ,Poli(o-toluidin),Kaolinit,Kompozit,İletken polimer,Sıcaklık sensör,Nem sensör ,poly(o-toluidine) ,lcsh:Engineering (General). Civil engineering (General) - Abstract
İletken poli(o-toluidin)/kaolinit kompoziti,kaolinit varlığında yükseltgen olarak amonyum persülfat kullanılarako-toluidinin kimyasal polimerizasyonu ile hazırlandı. Hazırlanan iletkenkompozitin nem ve sıcaklık algılayıcısı olarak kullanımını araştırabilmek içinkompozitin içerdiği iletken POT miktarı ve kompozitin iletkenlik değerlerinepolimerizasyon koşullarından HCl, o-toluidin ve yükseltgen madde derişimlerininetkisi incelendi. En yüksek poli(o-toluidin) miktarı (%29.4) ve iletkenliğesahip (8.3×10-4 Scm-1) kompozitin 0.2 M amonyumpersülfat, 0.4 M o-toluidin ve 1.0 M hidroklorik asit kullanılarak 20 °Csıcaklıkta ve 2 sa. sürdürülen polimerizasyon ile elde edildiği bulundu. Safpoli(o-toluidin) ve poli(o-toluidin)/kaolinit kompozitinin direnç değerleri0-100 °C sıcaklık aralığında tekrar edilen ısıtma-soğutma işlemleri sırasındaizlenerek sıcaklığa karşı duyarlılığı incelendi. Bağıl nem oranı %30-90arasında değiştirilen ortamlarda saf poli(o-toluidin) ve kompozitin dirençdeğerleri ölçülerek nem sensör davranışı belirlendi. Hazırlanan kompozitinkarakterizasyonu Fourier dönüşümlü kızılötesi spektroskopisi (FT-IR), X-Işınları kırınımı (XRD), termogravimetrik analiz (TGA) ve taramalıelektron mikroskobu (SEM) teknikleri ile yapıldı., Conductivepoly(o-toluidine)/kaolinite composite was synthesized via chemicalpolymerization of o-toluidine in the availability of kaolinite using ammoniumpersulfate as oxidizing agent. To investigate the use of the preparedconductive composite as humidity and temperature sensor, the effect ofpolymerization conditions such as HCl, o-toluidine and oxidant concentrationson the amount of conductive POT contained in the composite and the conductivityvalues of composites were investigated. It was found that the composites withthe highest poly (o-toluidine) content (29.4%) and conductivity (8.3×10-4 Scm-1)were obtained by 0.2 M ammonium persulfate, 0.4 M o-toluidine and 1 Mhydrochloric acid for 2 hours of continuous polymerization at 20 °C. Theresistivity values of pure poly(o-toluidine) and poly (o-toluidine)/kaolinite composite were monitored during heating-cooling cyclesin the range of 0-100 °C. Changes in resistivity for pure poly(o-toluidine) andpoly(o-toluidine)/kaolinite composite with humidity 30-90% were examined andhumidity sensor behavior was determined. Characterization of the preparedcomposite was performed by Fourier transform ınfrared spectroscopy (FT-IR),X-ray diffraction (XRD), thermogravimetric analysis (TGA) and scanning electronmicroscopy techniques (SEM).
- Published
- 2018
15. Polivinil alkol/CuO nanokompozit hidrojeller: kolay sentezi ve uzun-süreli kararlılığı
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Boran, Filiz, Karakaya, Çiğdem, and Boran, Filiz
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Swelling Behavior ,PVA ,Long-term Stability ,Ball Milled ,CuO Nanoparticles - Abstract
Within this study, Polyvinyl alcohol/CuO nanocomposite hydrogels were synthesized through dispersing CuO nanoparticles in a PVA solution, using the freeze-thawing procedure in order for physically crosslinking. The average particle size of CuO nanoparticles which was added to the hydrogel was determined as 3.51 nm according to the XRD analysis after the ball milling process. The presence of CuO nanoparticles in nanocomposite hydrogels was determined by UV-vis spectroscopy, FESEM, EDS, and FTIR analysis. Also, the rheological properties of neat hydrogel and PVA/CuO nanocomposite hydrogels were examined. The addition of CuO nanoparticles to the polymer structure develops rheological features of PVA hydrogels. The Effect of CuO content of nanocomposite hydrogels on the swelling behavior and long term stability was investigated. These nanocomposite hydrogels demonstrated unique properties for biomedical applications due to their high swellability at pH 2.1 as the pH values of the stomach and long term stability. According to these results, the addition of CuO to the hydrogel structure improved the swelling characteristics of neat PVA hydrogel. Bu çalışmada, polivinil alkol/CuO nanokompozit hidrojeller, fiziksel olarak çapraz bağlanma için donma-çözme prosedürü kullanılarak PVA çözeltisi içinde CuO nanopartiküllerin dağıtılması yoluyla sentezlenmiştir. Hidrojele eklenen CuO nanopartikülerinin ortalama partikül boyutu bilyalı öğütme işleminden sonra yapılan XRD analiz sonuçlarına göre 3,51 nm olarak belirlenmiştir. Nanokompozit hidrojellerde CuO nanopartiküllerin varlığı UV-vis spektroskopi, FESEM, EDS ve FTIR analizi ile belirlenmiştir. Ayrıca saf hidrojelin ve PVA/CuO nanokompozit hidrojellerinin reoliojik özellikleri incelenmiştir. Polimer yapısına CuO nanopartiküllerinin ilave edilmesi, PVA hidrojellerinin reolojik özelliklerini geliştirmiştir. Nanokompozit hidrojellerin CuO içeriğinin, nanokompozitlerin şişme davranışı ve uzun süre kararlılığı üzerine etkisi araştırıldı. Bu nanokompozit hidrojeller, pH 2.1' deki yüksek şişebilirliklerinden dolayı, mide pH'ları ve uzun süreli kararlılıkları nedeniyle biyomedikal uygulamalar için benzersiz özellikler göstermiştir. Bu sonuçlara göre, CuO'nun hidrojel yapısına eklenmesi, saf PVA hidrojelinin şişme özelliklerini geliştirmiştir.
- Published
- 2019
16. Green Reduction Of Graphene Oxide By Using Kombucha Tea
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Kütük, Nurşah, Boran, Filiz, Çetinkaya Gürer, Sevil, and Boran, Filiz
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Kombucha Tea ,Graphene Oxide,Kopmbucha Tea ,Graphene ,Oxide ,Mühendislik ,Graphite Powder ,General Medicine ,law.invention ,Reduction (complexity) ,Kopmbucha Tea ,chemistry.chemical_compound ,Engineering ,chemistry ,law ,Graphene Oxide ,Nuclear chemistry ,Reduction - Abstract
In this study, a simple and efficient method of reduction for the preparation of reduced graphene oxide (RGO) from graphene oxide (GO) using Kombucha Tea (KT) is reported. The graphene oxides (GOs) were produced from natural graphite (Gr) powders based on Hummers’ method. KT was used as natural reductants to reduction of GO. Polyphenol content of KT was determined by using Folin-Cioceltau method. KT and GO were mixed in certain ratios to reduce graphene oxide (RGO) at room temperature. RGO was characterized by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Fourer Transform Infrared (FTIR). It was clearly observed that the functional groups containing oxygen were reduced as a result of the analyzes.
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- 2019
17. Poli(sodyum 4-stiren sülfonat) Kaplı SnO2 Nanoparçacıklarının Sentezi, Karakterizasyonu ve Gaz Algılama Özelliklerinin İncelenmesi
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BORAN, Filiz, TAŞKIRAN, İmren, and ÇETİNKAYA, Sevil
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PSS,SnO2,Nanoparçacık,Nanokompozit,Hidrotermal yöntem,VOC ,Engineering ,PSS,SnO2,Nanoparticle,Nanocomposite,Hydrothermal method,VOC ,Mühendislik - Abstract
In this study, polyethylene glycol (PEG)-Tin Oxide/Poly(sodium 4-styrene sulfonate) (PEG-SnO2/PSS) nanocomposites were prepared by hydrothermal method in the presence of dimethyl formamide (DMF) for 2 hours. For this purpose, SnO2 nanoparticles of 16.4 nm size previously synthesized using PEG as a surfactant were used. The PEG-SnO2/PSS nanocomposite was synthesized with PSS and PEG-SnO2 in the presence of DMF at a reaction temperature of 0°C for 2 hours. The morphology and elemental analysis of PEG-SnO2/PSS nanocomposite were analyzed by scanning electron microcopy (SEM), Energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and Fourier transform infrared (FTIR) spectroscopy. FTIR and XRD analyzes showed that SnO2 nanoparticles were incorporated into the PSS polymer structure, while SEM and EDS analysis showed that the morphological structure of SnO2 nanoparticles was transformed from nanostructures into microsphere by encapsulating them with PSS polymer. Also, the results showed that the PEG-SnO2 surface was coated with PSS at an encapsulation rate of 39.53% under strong π-π interactions. Gas sensitivities of these samples against volatile organic compound (VOC) vapors such as ammonia, ethanol, acetone, formaldehyde and chloroform were investigated by two probe techniques using electrometer at room temperature. PEG-SnO2 nanoparticles showed high detection performance for ethanol gas. The pure PSS illustrated a high level of sensitivity to all VOC gases. According to the experimental results, it can be said that the PEG-SnO2 nanocomposite encapsulated by PSS can be used as a gas sensor material., Bu çalışmada, poli(etilen glikol)(PEG)-Kalay Oksit/poli(sodyum 4-stiren sülfonat) PEG-SnO2/PSS nanokompozitleri, 2 saat boyunca dimetil formamid (DMF) varlığında hidrotermal işlemle hazırlandı. Bunun için yüzey aktif madde PEG ile birlikte daha önceden sentezlenmiş olan 16,4 nm büyüklüğündeki SnO2 nanoparçacıkları kullanıldı. PEG-SnO2/PSS nanokompoziti, PSS ve PEG-SnO2 ile birlikte DMF varlığında 0°C reaksiyon sıcaklığında 2 saat sürede sentezlendi. Hazırlanan PEG-SnO2/PSS nanokompozitinin yapısal ve elementel analizi, taramalı elektron mikrokopisi (SEM), Enerji Dağılım X-Işınları Spektrometresi (EDS), X-ışını difraksiyonu (XRD) ve Fourier transform infrared (FTIR) spektroskopisi teknikleri ile yapıldı. FTIR ve XRD analizleri SnO2 nanoparçacıklarının PSS polimer yapısına katıldığını gösterirken, SEM ve EDS analizleri SnO2 nanoparçacıklarının morfolojik yapısının, PSS ile kompozitleri hazırlandığında PSS polimeri ile kapsüllenerek nanoyapıdan mikroküre yapılara dönüştüğünü gösterdi. Ayrıca, sonuçlar, PEG-SnO2 yüzeyinin, güçlü π-π etkileşimleri altında PSS ile % 39,53'lük bir kapsülleme oranı ile kaplandığını gösterdi. Bu örneklerin amonyak, etanol, aseton, formaldehit ve kloroform gibi uçucu organik bileşen (VOC) buharlarına karşı gaz duyarlılıkları, oda sıcaklığında, iki probe tekniği ile elektrometre kullanılarak incelendi. PEG-SnO2 nanoparçacıklarının etanol gazı için yüksek algılama performansı sergilediği görüldü. Saf olarak kullanılan PSS, VOC gazlarının hepsine karşı yüksek oranda duyarlılık gösterdi. Deney sonuçlarına göre, PSS ile kapsüllenen PEG-SnO2 nanokompozitinin gaz sensörü malzemesi olarak kullanım potansiyelinin arttırılabildiği söylenebilir.
- Published
- 2019
18. Comparison of indigo carmine decolorization by Pseudomonas aeruginosa and crude laccase enzyme from Funalia trogii
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BORAN, Filiz, BİRHANLI, Emre, YEŞİLADA, ÖZFER, and ÖZBEY, Elif
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Bacterium,crude laccase,decolorization,indigo carmine - Abstract
The effects of incubation time, temperature, initial pH, and dye concentration on the indigo carmine decolorization activity of Pseudomonas aeruginosa ATCC 10145 and some factors on the decolorization potential of crude laccase enzyme obtained from Funalia trogii ATCC 200800 were comparatively investigated. This bacterium showed effective decolorization activity at all agitation and temperature values. Indigo carmine was greatly decolorized by P. aeruginosa at all pH values except pH 10. A decrease in decolorization activity occurred with increasing dye concentration, but this bacterium effectively decolorized the dye within 24 h. The decolorization process was through microbial metabolism, not biosorption. No decolorization or laccase activity could be obtained by the cell-free intracellular extract or culture filtrate of this bacterium. On the other hand, crude laccase effectively decolorized indigo carmine under highly acidic conditions, especially at pH 3.0 as 57% in 300 seconds. This activity decreased progressively due to the increase in pH values. In a short incubation period and at high temperature values, the crude laccase enzyme removed the color of the dye at 50 °C (56%), 60 °C (45%), and 70 °C (38%). These data are important for improving methods for decolorization of textile dyes used at high temperatures in various industrial applications.
- Published
- 2019
19. The effect of starting material types on the structure of graphene oxide and graphene
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BORAN, Filiz, primary and ÇETİNKAYA GÜRER, Sevil, additional
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- 2019
- Full Text
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20. Geliştirilmiş elektrik iletkenliğine sahip POT/Na-Feldispat iletken kompozitlerinin sentezlenmesi ve karakterizasyonu
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Boran, Filiz, Çetinkaya, Sevil, Anaklı, Duygu, Karakışla, Meral, Saçak, Mehmet, and Hitit Üniversitesi, Mühendislik Fakültesi, Kimya Mühendisliği Bölümü
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Poli(o-toluidin) ,İletken Polimerler ,Na-Feldispat ,Poli(o-toluidin),Na-Feldispat,Kompozit malzemeler,İletken polimerler ,Kompozit Malzemeler ,Composite Materials ,Na-Feldspar ,Conductive Polymers - Abstract
research Bu çalışmada iletken POT/Sodyum Feldispat kompoziti in-situ kimyasal polimerizasyon yöntemi ile hazırlandı. Sodyum Feldispat partikülleri varlığında asidik sulu ortamda hazırlanan kompozitin iletkenliği ve %POT verimi üzerine sodyum feldispatın tanecik boyutunun ve polimerizasyon koşullarının etkisi araştırıldı. En yüksek elektriksel iletkenlik ve verim için en uygun reaksiyon koşulları 45µm altı partikül boyutundaki Na-Feldispat, 1 M HCl, 0.3 M o-toluidin, 0.0375 M K2Cr2O7 ve 0°C sıcaklık olarak belirlendi. En yüksek POT verimi ve elektriksel iletkenlik değerleri sırasıyla %24.51 ve 22×10-5 Scm-1 bulundu. Hazırlanan kompozitin karakterizasyonu, kompozitin bileşenlerinin saf halleri ile karşılaştırılmalı olarak Fourier dönüşümlü kızılötesi spektroskopisi (FTIR), X-ışınları kırınımı (XRD), termal gravimetrik analiz (TGA) ve taramalı elektron mikroskop (SEM) teknikleri kullanılarak yapıldı. Recently, conductive polymeric materials have attracted a lot of interest in scientific and technological fields. Among all conducting polymers, polyaniline are of great interest due to easy synthesis, good environmental stability and its high conductivity. However, the main problem is the weak mechanical properties and workability of PANı based on insoluble in common organic solvents. This problem is resolved to some extent through the use of derivatives such as N-methyl or N-ethyl aniline, toluidine and anisidine instead of aniline. In these days, organic-inorganic nanohybrid materials known as polymer nanocomposites have become an effective alternative for many applications. Inorganic materials are used for imparting new and superior properties to composites.
- Published
- 2017
21. Synthesis and characterization of poly(o-toluidine)/kaolinite conductive composites for humidity and temperature sensing
- Author
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Boran, Filiz, primary, Çetinkaya, Sevil, additional, Karakışla, Meral, additional, and Saçak, Mehmet, additional
- Published
- 2018
- Full Text
- View/download PDF
22. Grafen-inorganik nanokompozitlerinin hazırlanması, karakterizasyonu ve gaz sensör özelliklerinin incelenmesi
- Author
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Boran, Filiz, Çetinkaya Gürer, Sevil, and Kimya Mühendisliği Ana Bilim Dalı
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Nanoparticles ,Chemical Engineering ,Kimya Mühendisliği ,Gas sersor ,Nanocomposites - Abstract
Bu çalışmada, inorganik bir malzeme olan kalay II klorür (SnCl2.H2O) kullanılarak kalay dioksit nanoparçacıkları (SnO2) hem ısıtma hem de hidrotermal yöntemle sentezlendi. SnO2 nanoparçacıklarının hazırlanması üzerine reaksiyon sıcaklığı, amonyak (NH3) derişimi ve reaksiyon süresi gibi çeşitli parametreler değiştirilerek gerçekleştirildi. Parçacık boyutu, dağılımı, morfolojisi üzerine bu parametrelerin etkisi incelendi. SnO2 nanoparçacıkların oluşumu için en uygun reaksiyon sıcaklığı 100ºC, NH3 derişimi 14 M ve reaksiyon süresi 12 saat olarak belirlendi. Elde edilen SnO2 nanoparçacıkları X-Ray difraksiyonu (XRD), yüksek çözünürlüklü elektron mikroskopisi (R-TEM), yüksek kontrastlı transmisyon elektron mikroskobu (C-TEM) ve Fourier dönüşümlü infrared spektroskopisi (FT-IR) ile karakterize edildi. Çalışmanın ikinci bölümünde, grafen (GR) sentezini gerçekleştirilmek amacıyla grafen oksit sentezi üzerine başlangıç malzemesi türünün etkisi araştırıldı. Öncelikle grafitten (G) aşırı oksitlenmiş grafit (AOG) ve grafit nanolevha (GN) sentezlendi. Daha sonra G, AOG ve GN kullanılarak, `Hummers` yöntemine göre, grafen oksit (GO) sentezlendi. Elde edilen GO'ler de indirgenerek `indirgenmiş grafen oksit` (IGO) elde edildi. Sentezlenen GO'lerden hidrotermal yöntemle GR elde edildi. Elde edilen GN, GO'ler, IGO'lerin ve GR'lerin karakterizasyonu XRD, C-TEM ve FT-IR ile yapıldı.Farklı morfolojilerde GR-SnO2 nanokompozitleri, SnCl2.H2O ve GO kullanılarak çeşitli sürfaktantlar (CTAB, TPAB, SDS, PVP, PEG), amonyak ve hidrazin varlığında hidrotermal yöntemle 12 saatte 100ºC sıcaklıkta teflon otoklavda sentezlendi. Hazırlanan nanokompozitlerin karakterizasyonu XRD, FESEM (taramalı elektron mikroskopisi), C-TEM ve FT-IR ile yapıldı. Bu örneklerin etanol, metanol, kloroform, tolüen ve aseton gibi uçucu organik bileşen (VOC) buharlarına karşı oda sıcaklığındaki gaz duyarlılıkları elektrometre ile iki probe yöntemiyle incelendi. Sentezlenen örneklerin kloroform ve tolüen için yüksek algılama performansları sergilediği görüldü. Bütün hazırlanan nanokompozitler içerisinde GR-SnO2-TPAB nanokompoziti etanol, aseton, tolüen, kloroform ve metanol gazlarının hepsine karşı yüksek oranda duyarlılık gösterdiği ve gaz sensörü malzemesi olarak kullanım potansiyelinin olduğu söylenebilir. In this study, firstly tin oxide nanoparticles (SnO2) have been synthesized using tin (II) chloride as an inorganic precursor by both hydrothermal and conventional heating methods. A systematic study on the preparation of SnO2 nanoparticles has been conducted by varying reaction parameters such as reaction temperature, concentration of ammonia and reaction time. Effect of the reaction parameters on the particle size, distribution and morphology was investigated and the best reaction parameters for the formation of SnO2 nanoparticles have been specified as 100 °C reaction temperature, 14 M ammonia concentration and 12 hours reaction time. The SnO2 nanoparticles obtained were characterized by X-ray diffraction (XRD), high-resolution transmission electron microscopy (R-TEM), high-contrast transmission electron microscopy (C-TEM) and Fourier transform infrared (FT-IR). In the second stage of the study, we report the effects of starting material types on graphene oxide (GO) synthesis with the aim of developming graphene (GR) synthesis. The graphene oxides (GOs) were prepared from natural graphite powders (NG), excessively oxidized graphite and graphite nanoplate (GNp) based on Hummers' method. The reduced graphene oxides (IGO) were synthesized by using graphene oxides obtained at the first stage of the experiment. Then GOs was used to prepare GR by hydrothermal method. GNp, GOs, IGOs and GRs were characterized by XRD, C-TEM and FT-IR.GR-SnO2 nanocomposites in different morphology were synthesized using tin (II) chloride and GO by hydrothermal method in the presence of hydrazine and ammonia by adding different surfactant such as CTAB, TPAB, SDS, PVP and PEG for 12 hours in a teflon autoclave at 100ºC reaction temperature. The synthesized nanocomposites were characterized by XRD, FESEM (Field Emission scanning electron microscopy), C-TEM and FT-IR. The gas sensing properties of the obtained samples to the vapors of various Volatile Organic Compounds (VOC), such as ethanol, methanol, chloroform, toluene and acetone were also investigated by two probe resistivity unit at room temperature. The prepared GR-SnO2 nanocomposites exhibited high detection performances for chloroform and toluene. GR-SnO2-TPAB nanocopozites have also higher detection performance then other nanocomposites for ethanol, aceton, toluene, methanol and chloroform gases. The nanocomposite could be used as sensor material for many VOC gases. 123
- Published
- 2016
23. Yeni izole edilmiş beyaz çürükçül funguslarla katı substrat fermentasyonu koşullarında lakkaz üretimi
- Author
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Boran, Filiz, Yeşilada, Özfer, and Biyoloji Anabilim Dalı
- Subjects
Mikrobiyoloji ,Biyoteknoloji ,Biology ,Microbiology ,Biyoloji ,Biotechnology - Abstract
Katı substrat fermentasyonu (KSF), doğal substratların kullanıldığı, serbest suyun olmadığı bir işlemdir. Biyoteknolojik süreçlerde alternatif bir metod olan bu fermentasyon işlemi, yüksek aktivite ve daha düşük maliyetli lakkaz üretimi için lignoselülozlu ham maddeleri kullanmaktadır. Organizmalar bu katı substratları hem bağlanma yeri hem de besin olarak kullanmaktadır. Biyolojik süreçlerde lignoselülozlu ham maddelerin kullanımı, çevresel problemlerin çözümüne yardımcı olabilmektedir.Bu çalışmada, yeni izole edilmiş olan Funalia trogii, Ganoderma lucidum ve Trametes versicolor'ın lakkaz üretimi KSF sürecinde araştırıldı. Farklı faktörlerin (katı substrat, sıcaklık, pH, nem içeriği ve indükleyiciler) lakkaz üretimine etkisi test edildi. Test edilen lignoselülozlu katı substratlar arasından buğday kepeği, lakkaz üretimi için en iyi katı substrat olarak belirlendi. Fungusların lakkaz üretimi üzerine soya unu, ağaç yaprakları, maya özütü ve bakırın etkisi de araştırıldı. Yüksek lakkaz aktivitesi için en iyi ortam, bakır ilave edilmiş buğday kepeği+soya unu ortamıdır. Optimum KSF koşulları, %75 nem içeriği, 30°C ve pH 5-6 dır.KSF cam tava tipi fermentör kullanılarak da yürütüldü ve en yüksek lakkaz aktiviteleri F.trogii, G.lucidum ve T.versicolor için sırasıyla 22469±2622, 2008±826 ve 2649±810 U/L olarak elde edildi.Ayrıca, bakır ilave edilmiş olan buğday kepeği+soya unu ortamlarında üretilen F.trogii, G.lucidum ve T.versicolor'dan elde edilen ham lakkazın aktivite ve kararlılığı üzerine pH ve sıcaklığın etkisi test edildi. Bu ham lakkazlar, özellikle pH 2.5-3.5 da yüksek aktivite gösterdi. Yüksek sıcaklıkta da kararlı oldukları gözlendi. G.lucidum ham lakkazının Remazol Brilliant Blue R (RBBR) renk giderimi aktivitesi, optimum koşullar altında bu tekstil boyasının rengini (400mg/L) 20 dakikada %61 giderebileceğini gösterdi. Sonuçlar, KSF'nin lakkaz üretimi için uygun olduğunu ve optimum koşullar altında bu funguslarla yüksek miktarda lakkaz elde edilebileceğini göstermektedir. En iyi uygulama şartlarını anlamak için ham lakkazların aktivite ve kararlılık profillerini belirlemek önemlidir.ANAHTAR KELİMELER: Katı substrat fermentasyonu, Funalia trogii, Ganoderma lucidum, Trametes versicolor, lignoselülozlu ham maddeler, ham lakkaz, renk giderimi Solid substrate fermentation (SSF) is a process occurring in the absence of free water, using natural substrates. This fermentation method which is an alternative method for biotechnologic processes uses lignocellulosic raw materials as solid substrates for laccase production with high activity and lower cost. Organisms utilize these solid substrates both as an attachment place and nutrition. Using lignocellulosic raw materials in bioprocesses may help to solve environmental problems.In this study, laccase production by newly isolated Funalia trogii, Ganoderma lucidum and Trametes versicolor was investigated during SSF process. The effect of different factors (solid substrate, temperature, pH, moisture content and inducers) on laccase production was tested. Among the tested lignocellulosic solid substrates wheat bran was determined the best solid substrate for laccase production. The effect of soy flour, tree leaves, yeast extract and copper on laccase production of fungi was also investigated. Wheat bran+soy flour medium supplemented with copper was the best medium for high laccase production. Optimum SSF conditions were 75% moisture content, 30°C and pH 5-6. SSF was also conducted using glass tray fermentor and high laccase activities as 22469±2622, 2008±826 and 2649±810 U/L were obtained for F.trogii, G.lucidum and T.versicolor, respectively. The effect of pH and temperature on crude laccase activity and stability, obtained from F.trogii, G.lucidum and T.versicolor grown on copper supplemented wheat bran+soy flour media were also tested. These crude laccases showed high activity especially at pH 2.5-3.5. They gave the highest activity in high temperatures. They were also detected as thermostable at high temperatures. Remazol Brilliant Blue R (RBBR) decolorization activity of crude laccase from G.lucidum showed that it could decolorize this textile dye (400 mg/L) as 61% within 20 minutes under optimal conditions. Results showed that, SSF has a potential for the laccase production and high amount of laccases could be obtained by these fungi under optimum conditions. It is important to determine the activity and stability profiles of these crude laccases for understanding the best application conditions.KEYWORDS: Solid substrate fermentation, Funalia trogii, Ganoderma lucidum, Trametes versicolor, lignocellulosic raw materials, crude laccase, dye decolorization 144
- Published
- 2013
24. Enhanced production of laccase by fungi under solid substrate fermentation condition
- Author
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Boran, Filiz, primary and Yeşilada, Ozfer, additional
- Published
- 2011
- Full Text
- View/download PDF
25. Synthesis and characterization of Poly HEMA-co-AAc /Diatomite hydrogel composites: Their application for heavy metal removal from the aqueous solution
- Author
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BORAN, Filiz and AKTİ, Filiz
- Subjects
Hydrogel Composite,Swelling Properties,Adsorption,Heavy Metal - Abstract
P oly 2-hydroxyethyl methacrylate-co-acrylic acid /diatomite hydrogel composite DHC materials were synthesized using in situ free radical addition polymerization technique. The effects of particle size and amount of diatomite were investigated on swelling properties such as the swelling degree SD , equilibrium swelling degree ESD and water retention WR of DHC. The particle size and amount of diatomite were not affected clearly in the swelling properties. The synthesized DHC with the particle size of -45μm and the amount of 5 wt % of diatomite showed the highest swelling properties. The SD g/g , WR % and ESD % values of hydrogel were increased up to 29.2, 45.5 and 96.7 from 1.1, 41.3 and 89.3 by adding diatomite into the structure of hydrogel, respectively. The hydrogel and DHC were characterized using Fourier transform infrared spectrometer FTIR and an optical microscope. Also, their thermal behavior was analyzed by differential scanning calorimeter DSC . The FTIR spectrums showed that diatomite incorporated into the hydrogel matrix at the high amount of diatomite. The DSC results indicated that the glass transition temperature Tg and melting temperature Tm of hydrogel increased with the addition of 2 wt % diatomite. The adsorption studies were performed using the hydrogel composite including 5 wt % of diatomite
26. Synthesis and characterization of poly(o-toluidine)/kaolinite conductive composites for humidity and temperature sensing
- Author
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Meral Karakışla, Mehmet Saçak, Sevil Çetinkaya, Filiz Boran, [Boran, Filiz] Hitit Univ, Engn Fac, Dept Chem Engn, Corum, Turkey -- [Cetinkaya, Sevil] Cumhuriyet Univ, Engn Fac, Dept Chem Engn, Sivas, Turkey -- [Karakisla, Meral -- Sacak, Mehmet] Ankara Univ, Dept Chem, Fac Sci, Ankara, Turkey, and Boran, Filiz
- Subjects
Materials science ,Composite number ,Composite ,temperature sensor ,02 engineering and technology ,sıcaklık sensör ,010402 general chemistry ,01 natural sciences ,Conductive composites ,i̇letken polimer ,kaolinit ,Kaolinite ,nem sensör ,conductive polymer ,composite ,humidity sensor ,poly(o-toluidine) ,Conductive polymer ,Temperature sensing ,kaolinite ,Temperature sensor ,kompozit ,Humidity ,Humidity sensor ,021001 nanoscience & nanotechnology ,0104 chemical sciences ,Characterization (materials science) ,Chemical engineering ,poli(o-toluidin) ,lcsh:TA1-2040 ,o-Toluidine ,0210 nano-technology ,lcsh:Engineering (General). Civil engineering (General) ,Poly(o-toluidine) - Abstract
WOS: 000453906100006, Conductive poly(o-toluidine)/kaolinite composite was synthesized via chemical polymerization of o-toluidine in the availability of kaolinite using ammonium persulfate as oxidizing agent. To investigate the use of the prepared conductive composite as humidity and temperature sensor, the effect of polymerization conditions such as HCl, o-toluidine and oxidant concentrations on the amount of conductive POT contained in the composite and the conductivity values of composites were investigated. It was found that the composites with the highest poly(o-toluidine) content (29.4%) and conductivity (8.3x10(-4) Scm(-1)) were obtained by 0.2 M ammonium persulfate, 0.4 M o-toluidine and 1 M hydrochloric acid for 2 hours of continuous polymerization at 20 degrees C. The resistivity values of pure poly(o-toluidine) and poly (o-toluidine)/kaolinite composite were monitored during heatingcooling cycles in the range of 0-100 degrees C. Changes in resistivity for pure poly(o-toluidine) and poly(o-toluidine)/kaolinite composite with humidity 30-90% were examined and humidity sensor behavior was determined. Characterization of the prepared composite was performed by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and scanning electron microscopy techniques (SEM)., Turkish Scientific and Technical Research Organization (TUBITAK) [107M542], This work was supported by Turkish Scientific and Technical Research Organization (TUBITAK) project numbered as 107M542.
- Published
- 2018
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