Transport properties of a commercial cation-exchange membrane in contact with divalent cations or proton - Divalent cation solutions during electrodialysis

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Output type: Journal article

UM6P affiliated Publication?: No

Author list: Taky M., Pourcelly G., Elmidaoui A.

Publisher: Elsevier

Publication year: 1996

Journal: Hydrometallurgy (0304-386X)

Volume number: 43

Issue number: 1-3

Start page: 63

End page: 78

Number of pages: 16

ISSN: 0304-386X


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The ionic transport of divalent cations and the competitive transport between protons and divalent cations through a commercial cation-exchange membrane are investigated by means of both current-transmembrane potential difference responses and ionic flux measurements. The apparent rate constants of penetration of ions into the membrane are obtained from both electrodiffusion Nernst-Planck equations and Bütler-Volmer relations. With protons-divalent cations mixed solutions (Zn2+, Ca2+, Mg2+), this apparent rate constant is always greater for protons than for divalent cations, regardless of the applied current density. With divalent cations only, no water splitting occurs.


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