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

Year 2018, Volume: 4 Issue: 2, 15 - 32, 17.12.2018

Sahin Demirci Sema Yıldız Nurettin Sahiner

https://doi.org/10.28979/comufbed.470339

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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