6533b86cfe1ef96bd12c8013
RESEARCH PRODUCT
Space charge effect on competitive ion transport through ion-exchange membranes
José A. ManzanaresK. A. LebedevE.g. LovtsovVictor NikonenkoV.i. Zabolotskysubject
Ion exchangeChemistryMechanical EngineeringGeneral Chemical EngineeringAnalytical chemistryGeneral ChemistrySpace chargeQuantitative Biology::Cell BehaviorDiffusion layerMembraneDepletion regionChemical physicsGeneral Materials ScienceDiffusion (business)Ion transporterWater Science and TechnologyConcentration polarizationdescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2002-09-01 | Desalination |