TR-Dizin İndeksli Yayınlar Koleksiyonu
Permanent URI for this collectionhttps://hdl.handle.net/20.500.12573/396
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Research Project Laterit Liç Çözeltisinden Sinerjik Solvent Ekstraksiyon (SSX) Yöntemi Kullanılarak Nikel ve Kobalt Kazanımı(2019) Kaya, Muammer; Kurşunoğlu, SaitBu çalısmada, nikel sülfat (NiSO4.6H2O), kobalt sülfat (CoSO4.7H2O), manganez sülfat (MnSO4.H2O), magnezyum sülfat (MgSO4.7H2O) ve kalsiyum klorür (CaCl2.2H2O) tuzları deiyonize su ile çözündürülerek sentetik bir liç çözeltisi hazırlanmıstır. Sentetik çözelti içerisinde seçimli olarak nikel ve kobalt kazanımı için sinerjik solvent ekstraksiyon (SSX) ve direkt solvent ekstraksiyon (DSX) yöntemleri uygulanmıstır. Organik ekstraksiyon çözeltisi olarak Cyanex 272 (bis (2,4,4-trimethylpentyl) phosphonic asit, Versatic 10 (neodecanoic asit) ve DEHPA/D2EHPA (di (2-ethylexyl) fosforik asit) n-Hexan içerisinde seyreltilerek kullanılmıstır. Organik çözelti içerisine ekstraksiyon esnasında olusabilecek üçüncül fazları ve yerel çökmeleri engellemek için ayarlayıcı olarak TBP (tributyl phosphate) kullanılmıstır. Kobalt Cyanex 272 solvent ekstraksiyon ünitesinde yaklasık pH 5,7?de manganez ile beraber ekstrakte edilmistir. Yüklü organik çözelti temizleme devresinde asitligi ayarlanmıs deiyonize su ile pH 5,5?de üç asama temizleme islemi görmüstür. Temizlenmis yüklü organik 2 kademe 10 g/L Co çözeltisi ile tekrar temizlenmistir. Temizlenmis yüklü çözelti pH 0,5?de 2 kademe sıyırma islemine tabi tutularak kobalt ve manganez yüklü çözelti elde edilmistir. Ikinci solvent ekstraksiyon ünitesinde organik ekstraktant olarak Versatic 10 kullanılmıstır. Cyanex 272 ünitesi sonunda kalan atık çözelti ikinci üniteye beslenmistir. Bu ünitede nikel yaklasık pH 6,9?da organik faza yüklenmistir. Yüklü organik pH 6,5?de asitligi ayarlanmıs deiyonize su ile 2 kademe temizlenmis ve ardından 2 kademe 10 g/L Ni çözelti kullanılarak tekrar temizlenmistir. Temizleme isleminden sonra pH 0,5?de 1 kademe sıyırma islemi gerçeklestirilerek yüklü nikel çözeltisi elde edilmistir. Çalısma sonunda, ilk ekstraksiyon kademesinde manganez sentetik liç çözeltisinden tamimiyle uzaklastırılamamıstır. SSX çalısmalarında %15 Cyanex 272+%5 Versatic 10+%5 TPB, %15 Versatic 10+%5 Cyanex 272+%5 TPB, %15 Cyanex 272+%5 Versatic 10+%5 DEHPA+%5 TBP ve %15 Cyanex 272+%5 DEHPA+%5 TBP sistemleri test edilmistir. %15 Cyanex 272+%5 Versatic 10+%5 TBP sisteminin Ni-Mg-Ca?yı Co?dan ayırmada kullanılabilecegi belirlenmistir. %15 Versatic 10+%5 Cyanex 272+%5 TPB sistemi kullanılarak Ca ve Mg arasında büyük bir seçimlilik oldugu ve bu iki metal iyonunun liç çözeltisinden seçimli olarak ayrılabilecegi görülmüstür. Aynı zamanda %15 Cyanex 272+%5 Versatic 10+%5 DEHPA+%5 TBP sistemi kullanılarak düsük pH degerlerinde Mn?nin Co?dan uzaklastırılabilecegi belirlenmistir.Article Türk Termik Santrallerinden İki Farklı Uçucu Kül Kullanarak Alkali Yakma Metoduyla Zeolit Sentezi(2020) Top, Soner; Vapur, HuseyinBu çalışmada, Sugözü termik santrali uçucu küllerinden sonrasında su liçi ile desteklenen bazik füzyon tekniği kullanılarak fojasit (Na-LSX) (3.5(Ca0.3)3.5(Na0.6)3.5(Mg0.1)Al7Si17O48•32(H2O)) türü, Çatalağzı uçucu küllerinden ise aynı tekniği kullanarak Ca-Filipsit (CaK0.6Na0.4Si5.2Al2.8O16•6(H2O)) türü zeolitler sentezlenmiştir. Bu yöntemlerde öncelikle yüksek sıcaklıkta kül fırınında uçucu küller ve sodyum hidroksit (NaOH) belirli oranlarda karıştırılarak 600 °C’de sinterlenmiş sonrasında öğütülen malzemelerden saf suda liç işlemi ile zeolitler elde edilmiştir. Katyon Değiştirme Kapasitesi (KDK), X-Işını Kırınımı (XRD), Taramalı Elektron Mikroskobu (SEM), Fourier Dönüşümlü Kızılötesi Spektroskopisi (FTIR), X-Işını Fluoresans (XRF) ve Atomik Adsorpsiyon Spektrometresi (AAS) analizleri ile sentezlenen zeolitler karakterize edilmiştir. Sugözü uçucu külleri ile (1:2 oranda) sentezlenen zeolitler 136,93 meq/100 g KDK’ne sahipken aynı oranda Çatalağzı uçucu külleri ile sentezlenen zeolitlerin 247,88 meq/100 g KDK’ne sahip oldukları belirlenmiştir. Sonuç olarak F sınıfı 2 ayrı uçucu kül kullanarak atıksu arıtıcı, enerji depolayıcı, katalist ve separator olarak kullanılabilecek zeolitler sentezlenmiştir.Article Investigation on Usage Possibilities of Gasification Plant Wood Waste and Sivas Kangal Lignite Coal in Dye Adsorption(2020) Top, Soner; Kırma, Ramazan; Uçkun, Şükrü; Sarıkaya, Musa; Timür, İrfanIn this study, the usage possibilities of wood waste obtained from Gebze MDF and ParticleBoard Gasification Plant preliminary studies and Sivas Kangal lignite coal as absorbents wereinvestigated. In this way, it was aimed both to evaluate the wastes and to prevent environmentalpollution with materials that are cheaper and easier to obtain. The structure and surface propertiesof wood waste and coal samples crushed and ground to -75 µm size and used as adsorbent wereinvestigated by XRD, SEM and BET analyses. In addition, samples have been characterized byelemental, ash, moisture, volatile matter and fixed carbon analyses. In the experiments, methyleneblue (MM) with the formulation of C16H18CIN3 S.xH2 O was used. The effects of temperature, mixingtime and concentration parameters on MM adsorption were investigated. Langmuir isotherms werecreated for different temperatures at optimum concentrations. As a result, it has been revealed thatlignite coal and wood waste can be used as adsorbent. A 10 ppm MM for lignite coal and 3 ppmMM for wood waste were determined to be ideal concentrations for adsorption.Article Boronik Asit İçeren Zirkonyum Esaslı Metal-Organik Kafes Yapıların Üretimi ve Şeker Molekülü Yakalama Kapasitelerinin Belirlenmesi(2022) Erkartal, MustafaFunctionalizations of metal-organic frameworks (MOF) by the mixed-ligand synthesis method are of great interest in various fields. In this study, Zr-MOFs with free boronic acid -B(OH)2 functional groups on the pore surfaces were successfully synthesized by incorporating 4-carboxyphenyl boronic acid ligands into the UiO-66 (Zr) using the mixed-ligand method. The crystal structures and compositions of the MOFs obtained in the study were elucidated by PXRD, FTIR, 1H-NMR measurements. The surface areas of the MOFs, whose nitrogen gas adsorption measurements were carried out at -196 °C, were calculated according to the BET theory and the pore sizes were calculated according to the NLDFT theory. After activation of all obtained MOF structures, their adsorption capabilities of cis-diol containing sugar molecules (glucose, fructose, galactose and xylose) was measured by HPLC. It was observed that the boronic acid-containing UIO-66B structures had better sugar adsorbing capacities than the unfunctionalized UiO-66 structures due to the covalent interactions between boronic acids and cis diols. It was observed that the sugar adsorption capacity increased with increasing boronic acid ratio in the structure and increasing of pH of the medium.Article Citation - Scopus: 2Zeolite Synthesis by Alkali Fusion Method Using Two Different Fly Ashes Derived From Turkish Thermal Power Plants(Chamber of Mining Engineers of Turkey, 2020-03-01) Top, S.; Vapur, HüseyinIn this study, Faujasite (Na-LSX) (3.5(Ca0.3)3.5(Na0.6)3.5(Mg0.1)Al7Si17O48 32(H2O)) type zeolites and Ca-Filipsite (CaK0.6Na0.4Si5.2Al2.8O16 6(H2O)) type zeolites were produced from Sugözü Thermal Power Plant and Çatalaǧzi Thermal Power Plant fly ashes by alkali fusion method followed by water leaching, respectively. In these methods, fly ashes and sodium hydroxide (NaOH) were mixed in certain proportions and sintered at 600°C in ash furnace. Then, zeolites were obtained from the ground materials after water leaching and solid/liquid separation, respectively. Cation Exchange Capacity (CEC), X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), Fourier-Transform Infrared Spectroscopy (FTIR), X-Ray Fluorescence (XRF) and Atomic Absorption Spectrometer (AAS) analyses were used to characterize the synthesized zeolites. The zeolites synthesized with Sugözü fly ashes in a ratio of 1:2 had 136.93 meq/100 g CEC, whereas the CEC of synthesized zeolite from Çatalaǧzi fly ashes was found to be 247.88 meq/100 g. As a result, zeolites, which can be used as wastewater treatment agent, energy storage material, catalyst and separator, were synthesized by using 2 different Class F fly ash. © 2023 Elsevier B.V., All rights reserved.Article Jips Artığından Taguchi Yaklaşımı Kullanılarak Çöktürülmüş Kalsiyum Karbonat (ÇKK) Üretimi(2022-04-15) Altıner, Mahmut; Top, Soner; Kaymakoglu, BurcinBu çalışmada, desülfürizasyon ünitesinden elde edilen jips (DJ) taneciklerinin çöktürülmüş kalsiyum karbonat (ÇKK) taneciklerine direk mineral karbonatlaştırma yöntemi ile dönüştürülmesi sırasında ultrasonik güç uygulama, sıcaklık, karbondioksit (CO2) besleme hızı deneysel parametrelerinin etkileri Taguchi yaklaşımı kullanılarak araştırılmıştır. Deneylerde venturimetre ünitesi karbonatlaştırma zonu olarak kullanılmıştır. Elde edilen ürünlerin karakterizasyonu XRD, SEM ve tane boyutu analiz yöntemleri ile belirlenmiştir. Ayrıca ürünlerin özellikleri ASTM standartları dikkate alınarak değerlendirilmiştir. Sonuç olarak; üretim şartlarına bağlı olarak iğnemsi, kübik veya delikli yapıda kalsit kristallerinden oluşan ÇKK tanecikleri elde edilmiştir. ASTM standartlarına göre endüstriyel bir artıktan üretilen bu ürün, boya ve plastik sektörlerinde değerlendirilebilmesi için gereken özellikleri sağlamaktadır.Article Green Synthesis of C-Quantum Dots Modified Zno Nanophotocatalyst: the Effect of Different Solvents Used in Production of C-Quantum Dots Modified Zno Nanophotocatalyst on Photocatalytic Performance(2022-12-27) Duran, Ali; Inci, Abdullah; Vurucuel, Merve; Yılmaz, ErkanAccess the quality and sufficient amount of water is started to being problem with population increasing. One of the way to behalf the solution of this problem is usage waste water treatment in industry and agriculture. Wastewater treatment methods have disadvantages of being costly and producing secondary pollutants, photocatalysis, which is one of the advanced oxidation methods that is more advantageous and effective in removing pollutants, is promising. The newest member of nanomaterial, C-quantum dots (CQDs) has been increasingly get attention on lots of field including photocatalyst. Semiconductors are commonly used in photocatalysis however, they have electron pair recombination problem that results decreasing of efficiency. Doping semiconductors with different nanomaterials is one of the easiest ways to get over the problem. Recently CQDs has been started to used as dopping agent. Solvothermal method is among the easiest and environmentally friendly methods in nanomaterial synthesis. In this study, the effect of dimethylformamide, dimethylsulfoxide, ethylene glycol and water as solvothermal solvent on the photocatalytic efficiency of C-modified ZnO nanoparticles (CQDs@ZnO NPs) was investigated for the first time in the literature. Photocatalytic performance of CQDs@ZnO NPs was investigated on the photocatalytic degradation of methylene blue (MB). Angora mohair has been used as a CQDs source for the first time in the literature. Photocatalytic degradation performances of CQDs@ZnO NPs for MB at 300 min were 82.4%, 87.6% and 99% for ethylene glycol-water mixture, DMSO and DMF, respectively. The results proved that solvent type for solvothermal synthesis procedure has important role for photocatalytic performance of CQDs@ZnO NPs.Article Manganzı Demir Cevherinden Manganın Çözündürülmesinde Farklı İndirgeme Maddelerinin Etkisi(Chamber of Mining Engineers of Turkey, 2022-06-26) Top, S.; Altiner, Mahmut; Kursunoglu, SaitIIn this paper, the manganese extraction from a manganiferous iron ore was investigated using reductive leaching. Various chemicals were used as a reducing agent to leach manganese selectively from the ore in the presence of sulfuric acid (H2SO4) solution. Firstly, optimum dissolution values were determined for selective manganese dissolution without using a reducing agent. As it was aimed at the selective extraction of manganese from the ore, the reductive leaching tests were conducted by adding the reducing agents under the following optimal parameters: a leaching time of 1 h, a stirring speed of 300 rpm, a temperature of 70°C, a sulfuric acid concentration of 1 M where the ore was leached with an extraction ratio of 11.54% Mn and 2.16% Fe. Manganese was dissolved with high efficiencies (up to 97.46%) from the ore by using different organic compounds (tartaric acid (C<inf>4</inf>H<inf>6</inf>O<inf>6</inf>), oxalic acid (C<inf>2</inf>H<inf>2</inf>O<inf>4</inf>), citric acid (C<inf>6</inf>H<inf>8</inf>O<inf>7</inf>), glucose (C<inf>6</inf>H<inf>12</inf>O<inf>6</inf>), sucrose (C<inf>12</inf>H<inf>22</inf>O<inf>11</inf>), and maleic acid (C<inf>4</inf>H<inf>4</inf>O<inf>4</inf>)) as the reducing agents. © 2022 Elsevier B.V., All rights reserved.