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

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

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.
Keywords:

cryogel, cobalt, Ion Imprinted polymer, selective recognition,

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Cumhuriyet Science Journal-Cover
  • ISSN: 2587-2680
  • Yayın Aralığı: Yılda 4 Sayı
  • Başlangıç: 2002
  • Yayıncı: SİVAS CUMHURİYET ÜNİVERSİTESİ > FEN FAKÜLTESİ
Arşiv
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Yeni Bir Co(II)-Baskılı Polimer/Kriyojel Sistem Kullanılarak Kobalt(II)'ın Seçici Olarak Ayrılması

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