A Kinetic Investigation of a Carrier-Mediated Transport through a Bulk Liquid Membrane

Document Type: Research Article


1 Department of Chemistry, Faculty of Science, Zanjan University, P.O.Box 45195-313 Zanjan, I. R. IRAN

2 ECPM, Université Louis Pasteur, 25, Rue Bequrel, 67200 Strasbourg, FRANCE


The kinetics of the potassium thiocyanate transport mediated by dicyclohexyl-18-crown-6 (L) through a bulk liquid membrane is studied experimentally and theoretically. The proposed model is based on the assumption of a pure diffusion of the complex salt [K·L]+SCN¯ through the liquid membrane stagnant films at the interfaces. It illustrates the connection between liquid-liquid extraction equilibrium data and transport rates. The evaluation of the transfer coefficient allows to evaluate the organic stagnant films thickness, the stationary state transport rate and the time lag.


Main Subjects

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