High Diffusion Permeability of Anion-Exchange Membranes for Ammonium Chloride: Experiment and Modeling.

ABSTRACT: It is known that ammonium has a higher permeability through anion exchange and bipolar membranes compared to K⁺ cation that has the same mobility in water. However, the mechanism of this high permeability is not clear enough. In this study, we develop a mathematical model based on the Nernst-Planck and Poisson's equations for the diffusion of ammonium chloride through an anion-exchange membrane; proton-exchange reactions between ammonium, water and ammonia are taken into account. It is assumed that ammonium, chloride and OH^- ions can only pass through membrane hydrophilic pores, while ammonia can also dissolve in membrane matrix fragments not containing water and diffuse through these fragments. It is found that due to the Donnan exclusion of H⁺ ions as coi

SUBMITTER: Skolotneva E 

PROVIDER: S-EPMC9147341 | biostudies-literature | 2022 May

REPOSITORIES: biostudies-literature