Kinetics of cadmium(II) transport through a liquid membrane containing tricapryl amine in xylene

Coupled transport of Cd(II) ions through a supported liquid membrane containing tricapryl amine in xylene has been examined. The influences of stirring rate, carrier concentration, stripping agent, and H+ concentration in the feed solution were investigated. The transport of Cd(II) ions is coupled by cotransport of protons, The kinetics of Cd(II) transport could be analyzed in the formalism of two consecutive irreversible first-order reactions. The pseudofirst-order apparent rate constants of interfacial reactions in membrane transport were determined with bulk liquid membrane at various temperatures. The activation energy values are 14.7 kJ.mol(-1) for extraction and 12.4 kJ.mol(-1) for stripping.