Nonsteady Electrochemical Processes in Ion Exchangers

The processes of ion transport are studied using the model of a single ion-exchanger particle. The MA-40 anion-exchange membrane is chosen as a model. The fundamental difference between the membrane model of the ion exchanger and the ion exchanger itself is that the electric potential inside the solid phase can be measured on the membrane due to a special design of the measuring device. This measurement is impossible in the ion exchanger itself. Due to the indicated feature of the chosen membrane model, it became possible to propose a simple mathematical model of the process for analyzing the potential dynamics graphs. The time-varying potentials are measured on both sides of the membrane using the AgCl/Ag reference electrodes. The dynamics of time changes in the potentials of the membrane surfaces is recorded. The time change in the membrane potentials reflects the process of establishing the ion-exchange equilibrium at the membrane-solution interface. The mechanism of transfer processes across the interphase boundary is discussed.