Yeni Bir Co(II)-Baskılı Polimer/Kriyojel Sistem Kullanılarak Kobalt(II)'ın Seçici Olarak Ayrılması

Yıl 2018, Cilt: 39 Sayı: 4, 920 - 927, 24.12.2018

Gurbet Canpolat

https://doi.org/10.17776/csj.455103

Cited By: 3

Öz

Bu çalışmanın amacı, iyon baskılama tekniği ile sulu çözeltilerden
Co(II) iyonunun seçici olarak ayrılmasını ve ön derişimini araştırmaktı. Bu
amaçla, Co(II)-metakriloilhistidin ((MAH)₂-Co(II)) kompleks monomer sentezlendi
ve 2-hidroksietil metakrilat (HEMA) varlığında polimerleştirildi. Ardından, 5.0
mol*L^-1 HNO₃ ile bağlı Co(II) iyonları polimerden
söküldü. Böylece, hedef iyonun (Co(II)), p-HEMA-MAH kriyojel kolonuna tekrardan
bağlanması için spesifik boşluklar oluşturuldu. Hazırlanan metal kompleks ve
baskılı-kriyojel FTIR ve SEM ile karakterize edilmiştir. Optimum adsorpsiyon
koşullarını belirlemek için, pH, başlangıç konsantrasyonu, akış hızı, iyonik
şiddet gibi çeşitli parametrelerin etkisi araştırılmıştır. Maksimum adsorbe
edilen Co(II) miktarı, pH 8.0'de 1 mL*dk^-1 akış hızında 106.0 mg*g^-1
olarak tespit edilmiştir. Seçicilik deneyleri için, bağlanma çalışmaları Cu(II)
ve Ni(II) varlığında gerçekleştirilmiş olup k (seçicilik katsayısı) değerleri
sırasıyla Co(II)/Cu(II) ve Co(II)/Ni(II) ikili karışımı için 8.9 ve 3.8 olarak
bulunmuştur. Kolonun tekrar kullanımı araştırılmış ve ardışık on bir deneyde
bile adsorpsiyon kapasitesinde önemli bir azalma olmadığı tespit edilmiştir.

Anahtar Kelimeler

İyon Baskılı Polimer, kriyojel, kobalt, seçici tanıma

Selective Separation of Cobalt Using a New Co(II)-Imprinted Polymer/Cryogel System

Öz

The aim of the present study was to investigate selective separation and
preconcentration of Co(II) ions in aqueous solutions by ion imprinted
technique. For this purpose, Co(II)-methacryloylhistidine((MAH)₂-Co(II))
complex monomer has been synthesized and polymerized with presence of
2-hydroxyethyl methacrylate (HEMA) followed by flushed out of bonded Co(II)
ions from polymer with 5.0 mol*L^-1 HNO₃. Thus, specific
cavities for re-binding of target ions (Co(II)) have been created onto
p-HEMA-MAH cryogel column. Prepared metal complex and Co-imprinted
polymer/cryogel system have been characterized by FTIR and SEM. The effect of
various parameters such as pH, initial concentration, flow rate, ionic strength
have been investigated to determine optimal adsorption conditions. The maximum
amount of adsorbed Co(II) has found as 106.0 mg*g^-1 at pH 8.0 with
flow rate of 1 mL*min^-1. For selectivity experiments, binding
studies were carried out presence of Cu(II) and Ni(II). The k (selectivity
coefficient) values have found as 8.9 and 3.8 for Co(II)/Cu(II) and
Co(II)/Ni(II) binary mixture, respectively. The reuse of column also has been
investigated and there was no significant decrease at adsorption capacity even
in consecutive eleven experiments.

Anahtar Kelimeler

cryogel, cobalt, Ion Imprinted polymer, selective recognition

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