4-Nitrofenol ile Boyar Madde Çözelti Karışımlarını Aynı Anda İndirgeme ve Bozundurma Reaksiyonları için Poli(4-Vinil Piridin)-Co İyonik Sıvı Kriyojel Kompozit Katalizörü

Abstract

Bu çalışmada, poli(4-vinil piridin) (p(4-VP)) süper gözenekli kriyojelleri serbest radikal polimerizasyon tekniği ile kriyojenik koşullarda sentezlenmiştir ve hidroklorik asit ile muamele edilerek protonlanmıştır (p(4-VP)⁺Cl^-). Hazırlanan kriyojeller, Fourier Dönüşümlü Kızılötesi Işımalı spektroskopisi (FT-IR), Termogravimetrik Analiz cihazı (TGA), Taramalı Elektron Mikroskobu (SEM) ve optik mikroskop ile karakterize edilmişlerdir. P(4-VP)⁺Cl^- kriyojellerine CoCl₂'nin etanol çözeltisinden metal tuzu yüklenerek NaBH₄ varlığında indirgenerek iyonik sıvı (IL) kriyojeller içinde Co metal nanopartikül sentezi yapılmıştır. Kriyojeller içindeki metal miktarları atomik absorpsiyon spektroskopisi (AAS) ile belirlenmiştir ve p(4-VP)⁺Cl^--Co kriyojel kompozitinin 121,6±7,3 mg/g Co nanopartikülü içerdiği belirlenmiştir. Hazırlanan p(4-VP)⁺Cl^--Co kompozit kriyojelleri 4-nitro fenol (4-NP), eosin Y (EY), ve metilen mavisi (MM) çözeltilerinin karışımlarını aynı anda indirgeme ve bozunma reaksiyonlarında katalizör olarak kullanılmıştır. Buna göre, 4-NP/EY, 4-NP/MB ve 4-NP/EY/MB karışımlarındaki herbir molekül için p(4-VP)⁺Cl^--Co kriyojel kompozit katalizör varlığında %85’in üzerinde dönüşüm elde edilmiştir. Ayrıca, 4-NP, EY ve MM bileşiklerinin çözeltilerinin karışımlarında p(4-VP)⁺Cl^--Co kriyojel kompozit katalizörü kullanılarak indirgenme ve/ya bozunma reaksiyonları gerçekleştirilerek dönüşüm% ve bir mol katalizörün dakikada katalizlediği molekülün mol sayısı (TOF) değerleri hesaplanmıştır.  

Keywords

• p(4-VP) kriyojel,iyonik sıvı kriyojel,kriyojel-metal kompozit,katalizör,süpergözenekli kriyojel,eş zamanlı indirgenme/bozunma reaksiyonları

Poly (4-Vinyl Pyridine)-Co Ionic Liquid Cryogel Composite Catalyst for Simultaneous Reduction and Degradation Reactions of 4-Nitrophenol and Dye Mixtures

Abstract

In this study, superporous poly(4-vinyl pyridine) (p(4-VP)) cryogels were synthesized via free radical polymerization technique at cryogenic conditions and  were protonated (p)4-VP)⁺) by the treated of hydrochloric acid solution. The prepared cryogels were characterized by using Fourier Transform Infrared Radiation (FT-IR) spectrometer, Thermogravimetric Analysis (TGA), Scanning Electron Microscope (SEM), and optic microscope. Metal salt of CoCl₂ from ethanol solution was loaded into p(4-VP)⁺Cl^- cryogels and reduced in the presence of NaBH₄ to obtain Co metal nanoparticles within ionic liquid (IL) cryogels and the amount of Co nanoparticle within cryogels was determined by using Atomic Absorption Spectrometer (AAS) and found as 121.6±7.3 mg/g within p(4-VP)⁺Cl^--Co cryogel composites. Furthermore, the prepared p(4-VP)⁺Cl^--Co cryogel composites were used as a catalyst in reduction and degradation reaction of the mixtures of 4-nitro phenol (4-NP), eosin Y (EY), and methylene blue (MB) solutions simultaneously. Accordingly, for the each components of 4-NP/EY, 4-NP/MB and 4-NP/EY/MB mixtures over 85% conversion obtained in the presence of p(4-VP)⁺Cl^--Co cryogel composite catalyst. It was also calculated the % conversion and the numbers of moles of molecules catalyzed by one mole of catalyst (TOF) for the catalytic reduction and/or degradation of each one of the components 4-NP, EY and MM catalyzed by of p(4-VP)⁺Cl^--Co cryogel composite catalyst.

Keywords

• p(4-VP) cryogel,ionic liquid cryogel,cryogel-metal composite,catalyst,superporous cryogel,simultaneous reduction/degradation reaction,simultaneous reduction/degradation reaction

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