Model for the Competitive Transport of Ions through Ion Exchange Membranes with a Modified Surface

V. V. Nikonenko , V. V. Zabolotskii , K. A. Lebedev
Российский электрохимический журнал
Abstract / Full Text

A mathematical model for the membrane with a modified surface is considered. The proposedmodel is based on the Nernst–Planck equations. Surface modification is taken into account by introducing phenomenological conductivity coefficients. The competitive transport of two counterions is studied. It is shownthat the modifying layer affects significantly the permselectivity at low current densities and does not affect themembrane permselectivity at the limiting current. These regularities result in the appearance of an extremumin the dependence of the effective transport numbers on the current density.