Space charge effect on competitive ion transport through ion-exchange membranes
A mathematical model of the competitive electro-transport of two counter-ions through an ion exchange membrane based on the Nernst-Planck and Poisson equations is developed. A three-layer system is considered: the membrane and two adjacent diffusion layers. Concentration profiles in the three layers...
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| Veröffentlicht in: | Desalination 2002-09, Vol.147 (1), p.387-392 |
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| creator | Zabolotsky, V.I. Manzanares, J.A. Nikonenko, V.V. Lebedev, K.A. Lovtsov, E.G. |
| description | A mathematical model of the competitive electro-transport of two counter-ions through an ion exchange membrane based on the Nernst-Planck and Poisson equations is developed. A three-layer system is considered: the membrane and two adjacent diffusion layers. Concentration profiles in the three layers, effective transport numbers as functions of the current and current-voltage characteristics are calculated. Deviation from the local electroneutrality in space charge region near the depleted solution/membrane interface is taken into account. It is shown that the space charge region grows with the voltage applied. However the fluxes of the competitive counter-ions at over-limiting currents are determined by their transfer through the electroneutral part of the depleted diffusion layer. |
| doi_str_mv | 10.1016/S0011-9164(02)00614-8 |
| format | Article |
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| ispartof | Desalination, 2002-09, Vol.147 (1), p.387-392 |
| issn | 0011-9164 1873-4464 |
| language | eng |
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| source | Elsevier ScienceDirect Journals |
| subjects | Competitive transport Concentration polarization Ion-exchange membranes Mathematical modeling Space charge region |
| title | Space charge effect on competitive ion transport through ion-exchange membranes |
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