Ions transport modelling based on Nernst-Planck theory for a novel electrochemically switched ion permselectivity system

Abstract Electrochemically switched ion permselective (ESIP) is an emerging technology which requires very little energy for trace concentration ionic separation and has markedly high selectivity. Fully understanding transport process of ions through ESIP membranes is of importance for ESIP. In this work, a two-dimensional, steady-state, simple mathematical model was established, based on Nernst–Planck theory for the ions transport in ESIP system. The model is used to evaluate and analyze the effects of inlet concentration, volume flow, and cell voltage on the separation flux. Furthermore, the current efficiency model was established, paving the way for future energy calculations and cost estimation. It is critical to minimize its operating costs and energy consumption. The simulation results are in good agreement with dynamic experiments using laboratory reactors results, which verifies the reliability and practicability of the model.