SINGLE AND DOUBLE IMPRINTED POLYMER FOR SELECTIVE RECOGNITION OF Cd(II) IONS IN AQUEOUS MEDIA

Abstract

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In this paper, we have reported the synthesis of a new single and double-imprinted polymer material for the separation of Cd(II) ions in aqueous solutions. Chitosan has choosen as the Cd(II) metal complexing big polymer for single and double imprinted polymer. In the synthesis of single imprinted polymer, Cd(II)-complexed chitosan has crosslinked by epichlorohydrin.  In the synthesis of double imprinted polymer, Cd(II)-complexed chitosan was reacted with 3-mercaptopropyl-trimethoxysilane. Then, the polymeric beads have crosslinked with tetraethoxysilane (TEOS). The imprinted cadmium ion has removed from the polymeric matrix by 0.1M HNO₃ (to prepare Cd(II) templates).  Optimum pH for rebinding of Cd(II) on the single and double-imprinted polymers was 7.0. Equilibrium binding time and sorbent capacity have been found as 120 and 60 min, 342 and 172 mg g^-1 for single and double imprinted polymer, respectively. In selectivity studies, it has been found that double imprinted results in increased affinity of the material toward Cd(II) ion over other competitor metal ions with the same charge. The prepared single and double-imprinted polymer have repeatedly used and regenerated for thirty times without a significant decrease in polymer binding affinities.

Keywords

• Molecular imprinting

SULU ORTAMDA Cd(II) İYONLARININ SEÇİCİ TANIMLANMASI İÇİN TEK VE ÇİFT BASKILI POLİMERLER

Abstract

Bu çalışmada, sulu ortamda Cd(II) iyonlarının ayrımı için yeni tek ve çift baskılı polimerik materyal sentezi gerçekleştirilmiştir. Kitosan, tek ve çift baskılı polimer için metal kompleksleyici, büyük polimer olarak seçilmiştir. Tek baskılı polimerin sentezinde, Cd(II)-kitosan kompleksi epiklorohidrin ile çapraz bağlandı. Çift baskılı polimerin sentezinde ise, Cd(II)- kitosan kompleksi 3merkaptopropiltrimetoksisilan ile reaksiyona sokuldu. Daha sonra polimerik tanecikler, tetrametoksisilan (TEOS) ile çapraz bağlandı. Polimerik matrikste Cd(II) iyonlarına uygun yuva oluşturmak için, baskılı Cd(II) iyonları polimerden 0,1M HNO3 ile uzaklaştırıldı. Tek ve çift baskılı polimerlerde, Cd(II) iyonlarının tekrar bağlanmsı için, optimum pH 7’dir. Tek ve çift baskılı polimerler için bağlanma denge zamanları, sırasıyla 120 ve 60 dak. Olarak; Cd(II) sorbent kapasitesi ise sırasıyla 342 ve 172 mgg-1 olarak bulundu. Seçicilik çalışmalarında; çift baskılama sonuçları, Cd(II) iyonlarının diğer benzer yüklü yarışmacı iyonlara göre afinitesinin yüksek olduğunu göstermiştir. Hazırlanmış tek ve çift baskılı polimerlerin bağlanma kapasitelerinde kayda değer bir değişklik olmaksızın 30 kez tekrar kullanıldı

Keywords

• İyon baskılanmış polimer, Çift baskılanmış polimer, Kadmiyum tayini, Kitosan, sol-jel, Katı faz ekstraksiyonu

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