Transport and separation of Ag(+) and Zn(2+) by donnan dialysis through a monovalent cation selective membrane

A T Cherif; C Gavach; J Molenat; A Elmidaoui

doi:10.1016/s0039-9140(97)00394-9

Transport and separation of Ag(+) and Zn(2+) by donnan dialysis through a monovalent cation selective membrane

Talanta. 1998 Aug;46(6):1605-11. doi: 10.1016/s0039-9140(97)00394-9.

Authors

A T Cherif¹, C Gavach, J Molenat, A Elmidaoui

Affiliation

¹ Laboratoire des Matériaux et Procédés Membranaires CNRS, 1919 route de Mende, F34293, Montpellier, Cedex 5, France.

PMID: 18967293
DOI: 10.1016/s0039-9140(97)00394-9

Abstract

Donnan Dialysis of Ag(+) and Zn(2+) was investigated through a cation exchange membrane (CMS Neosepta) when a proton concentration difference was maintained between the two sides of the membrane. Developed for the production of brine from sea water, CMS Neosepta showed a higher permeability to monovalent than to bivalent cations. Several physico-chemical parameters have been determined (electrical resistance, membrane potential, sorption of electrolytes, Zn(2+) and Ag(+) diffusion coefficients). The flux of Ag(+) and the diffusion potential in the membrane increase with HNO(3) concentrations. Ag(+) and Zn(2+) can be separated because of the preferential membrane transfer for Ag(+).