Type: Article

Selective transport of zinc as Zn(SCN)42- ion through a supported liquid membrane using K+-dicyclohexyl-18-crown-6 as carrier

Journal: Journal of Membrane Science (03767388)Year: 2000/02/01Volume: Issue: 2

Shamsipur M.Azimi Gandomani G.^aMadaeni, Sayed Siavash

a :University of Isfahan - IRAN(IR) - Isfahan

DOI:10.1016/S0376-7388(99)00224-0Language: English

Abstract

A new supported liquid membrane (SLM) system for the selective transport of zinc ion is described. The SLM used is a thin porous polyvinyldifluride membrane impregnated with dicyclohexyl-18-crown-6 dissolved in nitrophenyloctyl ether. Potassium-dicyclohexyl-18-crown-6 acts as a highly efficient carrier for the uphill transport of zinc as Zn(SCN)42- through the SLM. In the presence of L-Cysteine as a metal ion acceptor in the strip solution, transport of zinc occurs almost quantitatively after 5h. The selectivity and efficiency of zinc transport from aqueous solution containing different mixtures of Co2+, Ni2+, Cu2+, Pb2+, Cd2+, Hg2+, Fe3+ and Cr3+ ions were investigated. In the presence of citrate ion and thiourea as suitable masking agents in the feed solution, the interfering effects of Pb2+ and Cu2+ ions were completely eliminated. Copyright (C) 2000 Elsevier Science B.V.

Author Keywords

K+-dicyclohexyl-18-crown-6 carrierL-CysteineSLMZinc transportZn(SCN)42-membraneseparationtransport