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Permselectivity of monovalent cation exchange membrane in ampholytic electrolyte: Modeling and experiment
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DOI：10.1016/j.desal.2025.118587.png)
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Abstract
En 中文
The permselectivity of monovalent cation exchange membranes is a significant factor in various industrial applications. However, current research on permselectivity primarily focuses on ternary strong electrolytes, but hardly concentrates on the ampholytic electrolyte systems, which restricts the applications of monovalent exchange membrane in ampholytic electrolyte related fields. In this study, a numerical simulation model, together with the validation experiment, was proposed to investigated the Na/Mg selectivity of monovalent cation exchange membranes in an ampholytic electrolyte (NaH2PO4 + Mg(H2PO4)2), and a strong electrolyte (NaCl + MgCl2) was set as a comparison. The results demonstrate that unlike the typical current-voltage curve of strong electrolyte, the ampholytic electrolyte exhibits two limiting current densities, and the transition of selectivity from increase to decrease occurs at the first limiting current density. At the same current density, the selectivity of the ampholytic electrolyte system is up to 27 % lower than that of the strong electrolyte system. At last, the mechanism of these findings was explained by multistage ionization and ion competition theories in the ampholytic electrolyte system.
Keywords:
Ion selectivity
Monovalent cation exchange membrane
Numerical simulation
Ampholytic electrolyte
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