Abstract
Anion-exchange membranes modified with a polyquaternium-22 (PQ-22) polymer were studied for their use in electrodialysis. The use of PQ-22 for modification makes it possible to “replace” weakly basic amino groups on the membrane surface with quaternary amino groups. It was found that the content of quaternary amino groups in PQ-22 is higher than the content of carboxyl groups, which is the reason for the effectiveness of this polymer even when modifying Ralex AHM-PES membranes that initially contain only quaternary amino groups. In the case of membranes containing weakly basic amino groups, the PQ-22 polymer modification efficiency is even higher. The surface charge of the modified MA-41P membrane increased, while the limiting current density on the current-voltage curves increased by more than 1.5 times and the plateau length decreased by 2.5 times. These and other characteristics indicate that the rate of water splitting decreased and the electroconvective mixing at the membrane surface intensified, which was confirmed by direct visualization of vortex structures. Increasing the surface charge of the commercial MA-41P anion-exchange membrane, reducing the rate of water splitting, and enhancing electroconvection leads to mitigated scaling on its surface during electrodialysis.
Funder
Ministry of Science and Higher Education of the Russian Federation
Subject
Filtration and Separation,Chemical Engineering (miscellaneous),Process Chemistry and Technology
Reference108 articles.
1. Bazinet, L., and Geoffroy, T.R. Electrodialytic Processes: Market Overview, Membrane Phenomena, Recent Developments and Sustainable Strategies. Membranes, 2020. 10.
2. Membrane Technologies in Wine Industry: An Overview;El Rayess;Crit. Rev. Food Sci. Nutr.,2016
3. Electrodialysis-based separation technologies: A critical review;Xu;AIChE J.,2008
4. Recent developments in catalyst-related PEM fuel cell durability;Borup;Curr. Opin. Electrochem.,2020
5. Identification of optimum synthesis conditions for a novel anion exchange membrane by response surface methodology;Kikhavani;J. Appl. Polym. Sci.,2014
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