Selective Separation of Thiocyanate Ion by Ion-Imprinted Polymer

Year 2009, Volume: 37 Issue: 3, 207 - 215, 01.08.2009

Ebru Birlik Özkütük Elif Özalp Ayça Atılır Özcan Sibel Emir Diltemiz

Abstract

Molecular imprinting is a emerging technology to create recognition sites in a polymeric matrix using a molecular template. The molecularly imprinted polymers MIPs are easy to prepare, stable, inexpensive and capable of molecular recognition. This manuscript describes a method for the selective binding behavior of SCN- ions on surface imprinted polymers which were prepared using chitosan succinate-Zn II complex. This polymer was prepared in the presence of epichlorohydrin and was imprinted with SCN- ions. After that, the template SCN- ions was removed using 1 M KOH solution. Selective cavities for the SCN- ions was obtained in the SCN- -imprinted chitosan-succinate beads. The effect of initial concentration of SCN- ions, adsorption time and imprinting efficiency on adsorption selectivity for SCN- -imprinted polymer were investigated. The adsorption process was fast and equilibrium was reached at around 30 min. Maximum adsorption capacity was found to be 95 mg g-1. The number of accessible binding sites Qmax , relative selectivity coefficient k’ and binding ability were also evaluated. The observed adsorption order under competitive conditions was SCN- >F- > Cl- > PO4 3- in mass basis.

Keywords

Ion-imprinted polymer, Thiocyanate separation, chitosan, solid phase extraction, Removal

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