Correction of pH of diluted solutions of electrolytes by electrodialysis with bipolar membranes |
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Authors: | V I Zabolotskii S V Utin N V Shel’deshov K A Lebedev P A Vasilenko |
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Institution: | 1.Kuban State University,Krasnodar,Russia |
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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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