Concentration polarization and water dissociation in ion-exchange membrane electrodialysis. Mechanism of water dissociation

摘要: A relationship between the current density i and efficiency η of H+ OH– ions generated by dissociation water above limiting in ion-exchange membrane electrodialysis has been proposed. Generation rates water, H2O [graphic omitted] H++ are given as difference forward reverse reaction rate. The transport is described according to Nernst–Planck equation. derived using conservation law for generation ions. Comparing calculated values with experimental ones, it clear that rate constant increases increasing i. Such an increase usually larger anion-exchange than a cation-exchange membrane. An especially remarkable seen placed aqueous MgCl2, NiCl2 or CoCl2 solution. This due violent cascade (snow slide) splitting molecules layer.