Issue |
J. Chim. Phys.
Volume 93, 1996
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Page(s) | 386 - 401 | |
DOI | https://doi.org/10.1051/jcp/1996930386 | |
Published online | 29 May 2017 |
Influence of the nature of cation on water splitting at the interface of a cation exchange membrane during electrodialysis
1
Laboratory of Separation Processes, Department of Chemistry, University of Kenitra, BP 133, Kenitra Morocco.
2
Laboratory of Materials and Membrane Processes, CNRS, BP 5051, 34033 Montpellier, France.
The phenomenon of water splitting occuring at the interface of a Selemion CMV cation exchange membrane in contact with solutions containing successively monovalent, divalent and trivalent cations was investigated. Under identical hydrodynamic conditions, this investigation is based on recording j-V curves, measurement of transport numbers and pH variations. Water splitting is not a direct consequence of concentration polarization phenomenon. The cation nature and especially its acidic character is an important parameter which explains the difference in the behavior of the Selemion CMV membrane in contact with solutions of different cations.
Résumé
Le phénomène de la dissociation de l'eau à l'interface d'une membrane échangeuse de cations Selemion CMV au contact de solutions de cations monovalent, bivalent et trivalent est étudié. Les techniques d'investigation sont l'enregistrement des réponses courant-potentiel, la mesure des nombres de transport et des variations de pH.
La nature du cation et principalement son caractère acide expliquent la différence de comportement de la membrane CMV au contact des différentes solutions.
Key words: cation exchange membrane / water splitting / polarization of concentration / acidic character of cations
Mots clés : membrane échangeuse de cations / dissociation de l'eau / polarisation de concentration / caractère acide des cations
© Elsevier, Paris, 1996