Permeation of cadmium through a supported liquid membrane impregnated with CYANEX 923

An experimental study of Cd(II) transport through a polymer-immobilised liquid membrane (PILM) using Cyanex 923 as carrier has been performed. Factors affecting cadmium permeability, such as stirring speed of the source phase, extractant concentration in the membrane phase, metal, HCl and H3PO4 concentrations in the source phase, etc., have been analyzed. Optimal experimental conditions for Cd(II) permeation and recovery (P-Cd = 34.3 mum/s and 85.8% recovery) were obtained after 3 h using membranes containing 30% v/v Cyanex 923 dissolved in xylene, using a microporous Durapore GVHP support, with water as stripping agent and initial source phase of 0.89 muM Cd, and 100 g/L each of HCl and H3PO4. (C) 2001 Elsevier Science B.V. All rights reserved.