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Nanosilika ve Polimerik Destek Malzemelerin Sulu Ortamlardan Cr(VI) İyonlarını Uzaklaştırma Performanslarının İyonik Sıvı Emdirilerek Geliştirilmesi

Improvement of the Sorption Performance of Nanosilica and Polymeric Solid Supports by Impregnation with Ionic Liquid for the Removal of Cr(VI) Ions from Aqueous Solutions

Journal Name:

  • Journal of The Turkish Chemical Society, Section B: Chemical Engineering

Publication Year:

  • 2016

Key Words:

Keywords (Original Language):

Author NameUniversity of AuthorFaculty of Author
Abstract (2. Language): 
In this study, supported ionic liquid phase (SILP) adsorbents were prepared by immobilizing the ionic liquids (ILs) onto nanosilica and styrene-divinylbenzene copolymer (SDVB) particles for the removal of hexavalent chromium, Cr(VI) ions from aqueous solutions. Three types of ionic liquids such as tricapryl methyl ammonium nitrate [A336][NO3], tricapryl methyl ammonium chloride (Aliquat® 336) and 1-ethyl-3- methylimidazolium bis(trifluoromethylsulfonyl)imide (EMIMTf2N) were successfully impregnated onto solid supports by following physical impregnation method through ultrasonication. The structural and morphological characterizations of the adsorbents were investigated by FTIR, SEM, and BET analysis. The thermal stabilities of the ionic liquid impregnated solid particles were also characterized by TGA analysis. Metal sorption performances of the prepared sorbents were investigated by considering Cr(VI) ions’ sorption regarding the thermodynamic and kinetic aspects. The effects of various analytical parameters on the sorption of Cr(VI) ions such as IL loading ratio, pH of the solution, adsorbent dosage, initial metal ion concentration were studied. Cr(VI) ions were quantitatively adsorbed in the pH range of 2-4 with the impregnation ratio of 1 g-IL/gsupport by all type of adsorbents. Moreover, the removal percentages of chromium ions were found to be 99.53%, 99.50% and 100% for TT600-TS, MOX80-TS and XAD-A, respectively. Sorption isotherms were also fitted with Langmuir equation and they were exhibited favorable sorption behavior.
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Abstract (Original Language): 
Bu çalışmada, sulu ortamlardan hekzavalent krom, Cr(VI) iyonlarının uzaklaştırılması için destekli iyonik sıvı faz (SILP) tutucular, iyonik sıvıların nanosilika ve polimerik destek malzemelere tutuklanması ile hazırlanmıştır. Trikapril metil amonyum nitrat [A336][NO3], trikapril metil amonyum klorür (Aliquat® 336) ve 1-etil-3-metilimidazolyum bis(triflorometilsülfonil)imid (EMIMTf2N) olmak üzere üç çeşit iyonik sıvı, ultrases varlığında fiziksel emdirme yöntemi izlenerek katı destek malzemelere başarı ile emdirilmiştir. Hazırlanan tutucuların modifikasyon öncesi ve sonrası kimyasal ve morfolojik yapılanmaları, FTIR, SEM ve BET analizleri ile incelenmiştir. Ayrıca, iyonik sıvı emdirilmiş katı taneciklerin ısıl davranışlarındaki değişim, TGA analizleri ile tanımlanmıştır. Hazırlanan tutucuların Cr(VI) iyonlarını tutma başarımları ise termodinamik ve kinetik davranışları temelinde incelenmiştir. İyonik sıvı yükleme oranı, çözelti pH’ı, tutucu miktarı, metal iyon derişiminin başlangıç değeri gibi analitik değişkenlerin tutucuların adsorplama verimi üzerine etkileri incelenmiştir. Hazırlanan tüm tutucu türleri için çözelti pH’ının 2-4 aralığında ve emdirme oranının 1 giyonik sıvı/g-destek malzeme olduğu koşullarda Cr(VI) iyonlarının dikkate değer bir biçimde uzaklaştırıldığı gözlemlenmiştir. Bununla birlikte, TT600-TS, MOX80-TS ve XAD-A tutucuları için krom iyonu uzaklaştırma yüzdeleri sırasıyla 99.53%, 99.50% ve 100%, olarak bulunmuştur. Ayrıca tutucuların denge davranışlarının Langmuir Denge İzotermlerine uyduğu sonucuna ulaşılmıştır.
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