Effect of Surface Modification with Cerium Oxide on the Transport Properties of Heterogeneous Anion Exchange Membranes MA-41

Surface modification of heterogeneous MA-41 anion-exchange membranes with cerium oxide particles, including those with a surface functionalized with phosphoric acid groups, was carried out. The resulting composite membranes were characterized by SEM, TGA, IR spectroscopy, and voltammetry. For membranes in various ionic forms, their conductivity, the number of anion transfers, as well as the selective permeability coefficients of singly and doubly charged anions in the process of electrodialysis desalting were determined. The modifying layer of cerium oxide practically does not change the conductivity of the membranes, but increases their selectivity to singly charged anions. Thus, the value of the selective permeability coefficient \(P({\text{C}}{{{\text{l}}}^{ - }}{\text{/SO}}_{4}^{{2 - }})\) of the modified MA-41 membrane increases from 0.82 to 1.01, and \(P({\text{NO}}_{3}^{ - }{\text{/SO}}_{4}^{{2 - }})\) increases from 1.38 to 1.60.