Sarapulova Veronika, Nevakshenova Ekaterina, Tsygurina Kseniia, Ruleva Valentina, Kirichenko Anna, Kirichenko Ksenia
Physical Chemistry Department, Kuban State University, 149 Stavropolskaya st., 350040 Krasnodar, Russia.
Department of Electric Engineering Thermotechnics and Renewable Energy Sources, Kuban State Agrarian University Named after I.T. Trubilin, 13 Kalinina st., 350004 Krasnodar, Russia.
Membranes (Basel). 2022 Dec 29;13(1):45. doi: 10.3390/membranes13010045.
Layer-by-layer adsorption allows the creation of versatile functional coatings for ion exchange membranes, but the stability of the coating and resulting properties of modified membranes in their operation is a frequently asked question. This paper examines the changes in voltammetric curves of layer-by-layer coated cation exchange membranes and pH-metry of desalination chamber with a studied membrane and an auxiliary anion exchange membrane after short-term tests, including over-limiting current modes. The practical operation of the membranes did not affect the voltammetric curves, but enhanced the generation of H and OH ions in a system with polyethylenimine modified membrane in Ca containing solution. It is shown that a distinction between the voltammetric curves of the membranes modified and the different polyamines persists during the operation and that, in the case of polyethylenimine, there is an additional zone of growth of potential drop in voltammetric curves and stronger generation of H and OH ions as indicated by pH-metry.
层层吸附法可用于制备具有多种功能的离子交换膜涂层，但涂层的稳定性以及改性膜在运行过程中的性能表现仍是一个常见问题。本文研究了经过短期测试（包括过极限电流模式）后，层层涂层阳离子交换膜的伏安曲线变化，以及装有研究膜和辅助阴离子交换膜的脱盐室的pH测定情况。膜的实际运行并未影响伏安曲线，但在含Ca溶液中，使用聚乙烯亚胺改性膜的系统中H⁺和OH⁻离子的生成量增加。结果表明，在运行过程中，改性膜与不同多胺的伏安曲线存在差异，对于聚乙烯亚胺，伏安曲线中存在一个额外的电位降增长区域，并且pH测定表明H⁺和OH⁻离子的生成更强。
