Theory of concentration polarization effects in electrodialysis on counter-ion selectivity of ion-exchange membranes with differing counter-ion distribution coefficients

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Abstract

This paper is concerned with the theory of the effect of concentration polarization under direct current upon the counter-ion selectivity of an ion-exchange electrodialysis membrane. The equilibrium selectivity is induced by the differing uptake of the counter-ions by the membrane, owing to the difference in their distribution coefficients between the membrane and solution phases. The numerical calculations are supplemented by an asymptotic analysis for a certain range of bulk concentrations and distribution coefficients, which provides an analytical expression for the dependence of selectivity on the electric current in the entire current range.

Original languageEnglish
Pages (from-to)1857-1861
Number of pages5
JournalPhysical Chemistry Chemical Physics
Volume86
Issue number10
DOIs
StatePublished - 1 Dec 1990

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

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