Abstract
The current efficiencies of the water dissociation water and the voltage-current characteristics of the bipolar (asymmetric bipolar) membranes were measured in a two-chamber electrochemical cell. The cell was formed of an MB-3 bipolar membrane or an asymmetric bipolar membrane, which is an MA-40 heterogeneous membrane with a thin surface layer in the form of a cation-selective homogeneous film and MA-40 and MA-41 heterogeneous monopolar membranes. The dissociation of water on MA-40 in 0.01 M sodium chloride decreased the current efficiency of the acid and alkali both in the channel with a bipolar membrane and in the channel with an asymmetric bipolar membrane. The effective ion transport numbers across MA-40 and MA-41 at different pH values were determined. The water dissociation rate on MA-40 decreased at pH > 9.5. A kinetic model of the electrodialysis of a dilute solution of sodium chloride in a two-chamber unit cell with a bipolar and anionite membranes was suggested.
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Original Russian Text © V.I. Zabolotskii, S.V. Utin, N.V. Shel’deshov, K.A. Lebedev, P.A. Vasilenko, 2011, published in Elektrokhimiya, 2011, Vol. 47, No. 3, pp. 343–348.
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Zabolotskii, V.I., Utin, S.V., Shel’deshov, N.V. et al. Correction of pH of diluted solutions of electrolytes by electrodialysis with bipolar membranes. Russ J Electrochem 47, 321–326 (2011). https://doi.org/10.1134/S1023193511030141
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DOI: https://doi.org/10.1134/S1023193511030141