Dependence of Electrochemical Properties of MK-40 Heterogeneous Membrane on Number of Adsorbed Layers of Polymers.

Autor: Rybalkina O; Physical Chemistry Department, Kuban State University, 149 Stavropolskaya St., 350040 Krasnodar, Russia., Tsygurina K; Physical Chemistry Department, Kuban State University, 149 Stavropolskaya St., 350040 Krasnodar, Russia., Sabbatovskiy K; Frumkin Institute of Physical Chemistry and Electrochemistry RAS, 31 Leninsky Prospect, 119071 Moscow, Russia., Kirichenko E; Department of Public and International Law, Kuban State Agrarian University Named after I.T. Trubilin, 13 Kalinina St., 350004 Krasnodar, Russia., Sobolev V; Frumkin Institute of Physical Chemistry and Electrochemistry RAS, 31 Leninsky Prospect, 119071 Moscow, Russia., Kirichenko K; Physical Chemistry Department, Kuban State University, 149 Stavropolskaya St., 350040 Krasnodar, Russia.
Jazyk: angličtina
Zdroj: Membranes [Membranes (Basel)] 2022 Jan 25; Vol. 12 (2). Date of Electronic Publication: 2022 Jan 25.
DOI: 10.3390/membranes12020145
Abstrakt: The creation of monovalent selective ion exchange membranes benefits the desalination of surface waters by removing interfering monovalent ions while preserving polyvalent ionic nutrients. Studies of a promising method of layer-by-layer adsorption of polymers for the creation of monovalent selective coatings note a significant effect of the number of formed layers and of the nature of the external layer on the properties of the resulting membranes. This article reports the changes in properties of layer-by-layer coated heterogeneous membranes occurring at increasing numbers of layers that are attributed to the supposed intermixing of polymers between the layers, namely dependence of limiting current densities determined from i-V curve, enhanced electroconvection that was attributed to the appearing electrical heterogeneity of the surface, and the decreasing monovalent selectivity in electrodialysis of mixed NaCl + CaCl 2 solution (from 1.33 to about 1) between the samples with five and six to eight layers of polymers.
Databáze: MEDLINE
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