Transport Study of Some Transition Metal Cations Through a Bulk Liquid Membrane Using Dicyclohexyl-18-crown-6 as Carrier

Abstract

Selectivitiy and transport efficiency for competitive transport of some transition metal cations containing Zn(II), Cd(II), Cr(III), Co(II), Ag(I), Pb(II) and Cu(II) across different bulk liquid membranes have been determined by dicyclohexyl-18-crown-6 as carrier. The membrane solvents include: dichloromethane, chloroform, 1,2-dichloroethane, nitrobenzene and chloroformdichloromethane, chloroform- dichloroethane binary mixed solvents. The effect of some surfactants on transport performance of the metal cations through bulk liquid membranes were also studied. The results show that the selectivity and the efficiency of transport for these heavy metal cations change with the nature of the organic solvents which were used as liquid membranes in these experiments. A good transport efficiency and high selectivity was observed for Pb(II) cation under the experimental conditions.