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Characterization of MK-40 Membrane Modified by Layers of Cation Exchange and Anion Exchange Polyelectrolytes

1
Membrane Institute, Kuban State University, 149 Stavropolskaya st., 350040 Krasnodar, Russia
2
Frumkin Institute of Physical Chemistry and Electrochemistry RAS, 31 Leninsky prospect, 119071 Moscow, Russia
3
Kuban State Agrarian University named after I.T. Trubilin, 13 Kalinina st., 350004 Krasnodar, Russia
*
Author to whom correspondence should be addressed.
Membranes 2020, 10(2), 20; https://doi.org/10.3390/membranes10020020
Received: 28 December 2019 / Revised: 21 January 2020 / Accepted: 23 January 2020 / Published: 27 January 2020
(This article belongs to the Section Membrane Preparation and Characterization)
Coating of ion exchange membranes used in electrodialysis with layers of polyelectrolytes is a proven approach that allows for the increasing of the limiting current, the suppressing of sedimentation, the controlling of the intensity of generation of H+ and OH ions, and also the improving of monovalent selectivity. However, in the case when two materials with the opposite sign of the charge of fixed groups come in contact, a bipolar boundary is created that can cause undesirable changes in the membrane properties. In this work, we used a MK-40 heterogeneous membrane on the surface of which a layer of polyethyleneimine was applied by adsorption from a solution as a model of heterogeneous membranes modified with oppositely charged polyelectrolyte. It was found that, on one hand, the properties of modified membrane were beneficial for electrodialysis, its limiting current did not decrease and the membrane even acquired a barrier to non-selective electrolyte transport. At the same time, the generation of H+ and OH ions of low intensity arose, even in underlimiting current modes. It was also shown that despite the presence of a layer of polyethyleneimine, the surface charge of the modified membrane remained negative, which we associate with low protonation of polyethyleneimine at neutral pH.
Keywords: electrodialysis; ion exchange membrane; MK-40; MF-4SC; polyethyleneimine; membrane modification; polyelectrolyte coating; zeta potential; current-voltage curve electrodialysis; ion exchange membrane; MK-40; MF-4SC; polyethyleneimine; membrane modification; polyelectrolyte coating; zeta potential; current-voltage curve
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MDPI and ACS Style

Titorova, V.; Sabbatovskiy, K.; Sarapulova, V.; Kirichenko, E.; Sobolev, V.; Kirichenko, K. Characterization of MK-40 Membrane Modified by Layers of Cation Exchange and Anion Exchange Polyelectrolytes. Membranes 2020, 10, 20.

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