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Open AccessArticle

Effect of Surface Inhomogeneity of Ion-Exchange Membranes on the Mass Transfer Efficiency in Pulsed Electric Field Modes

Membrane Institute, Kuban State University, 149 Stavropolskaya st., 350040 Krasnodar, Russia
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Membranes 2020, 10(3), 40; https://doi.org/10.3390/membranes10030040
Received: 19 February 2020 / Revised: 5 March 2020 / Accepted: 9 March 2020 / Published: 11 March 2020
(This article belongs to the Special Issue Membranes: 10th Anniversary)
Despite the growing interest in pulsed electric field modes in membrane separation processes, there are currently not many works devoted to studying the effect of the surface properties and composition of ion-exchange membranes on their efficiency in these modes. In this paper, we have shown the effect of increasing mass transfer using different kinds of ion-exchange membranes (heterogeneous and homogeneous with smooth, undulated, and rough surfaces) during electrodialysis in the pulsed electric field modes at underlimiting and overlimiting currents. It was found that the maximum increment in the average current is achieved when the average potential corresponds to the right-hand edge of the limiting current plateau of the voltammetric curve, i.e., at the maximum resistance of the system in the DC mode. For the first time, the development of electroconvective vortices was visualized in pulsed electric field modes and it was experimentally shown that even at relatively low frequencies, a non-uniform concentration field is preserved at the time of a pause, which stimulates the rapid development of electroconvection when pulses are switched on again. In the case of relatively high pulse frequencies, the electroconvective vortices formed during a pulse lapse do not completely decay during a pause; they only slightly decrease in size. View Full-Text
Keywords: electrodialysis; ion-exchange membrane; pulsed electric field mode; voltammetry; electroconvection; increasing of mass transfer; visualization electrodialysis; ion-exchange membrane; pulsed electric field mode; voltammetry; electroconvection; increasing of mass transfer; visualization
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    Doi: 10.5281/zenodo.3674713
    Link: http://doi.org/10.5281/zenodo.3674713
    Description: Video 1: Visualization of the vortex structures at the Neosepta AMX membrane surface in the desalination channel of the electrodialysis cell in the DC mode at i = 3.0 ilimLev; Video 2: Visualization of the vortex structures at the Neosepta AMX membrane surface in the desalination channel of the electrodialysis cell in the PEF mode at iav = 3.0 ilimLev (f = 0.5 Hz, α = 1/2); Video 3: Visualization of the vortex structures at the Neosepta AMX membrane surface in the desalination channel of the electrodialysis cell in the PEF mode at iav = 3.0 ilimLev (f = 5.0 Hz, α = 1/2).
MDPI and ACS Style

Butylskii, D.; Moroz, I.; Tsygurina, K.; Mareev, S. Effect of Surface Inhomogeneity of Ion-Exchange Membranes on the Mass Transfer Efficiency in Pulsed Electric Field Modes. Membranes 2020, 10, 40.

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