Carrier-mediated transport of toxic elements through liquid membranes - Transport of Cd(II) from high salinity chloride medium through supported liquid membrane containing TBP/cyclohexane

The transport of divalent cadmium ions from high salinity chloride medium t hrough SLM containing TBP in cyclohexane supported on cellulose acetate mem brane into a strip solution with EDTA has been studied. Permeability coeffi cients of metal ions increased with increasing the pH of feed from 1-4. It also increases with increasing membrane and strip concentrations. At higher concentrations of TBP in the membrane, metal transport was faster, further increase in TBP concentrations up to 80-100% (v/v), the metal transport sl owed down. The effect of temperature has been studied and the activation en ergy of the reactions has been evaluated to be 48 kcal/mol, which suggested that this process is chemical reaction controlled under the hydrodynamic c onditions. (C) 2000 Elsevier Science B.V. All rights reserved.