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Study of pH correction process of chloride-bicarbonate dilute solutions by electrodialysis with bipolar membranes

  • Special Issue of Journal Devoted to the Problems of Mass Transfer in the Electrochemical Systems
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Abstract

The pH of a dilute chloride-hydrocarbonate solution and the concentrations of chloride ions and carbonic acid anions at the outlet of the alkaline and acid chambers of the electrodialysis cell formed by bipolar and anion-exchange membranes were determined. The decrease in the concentration of hydrocarbonate ions in the alkaline chamber with growth of current density was not equal to its increase in the acid chamber. This disbalance was caused by two concurrent processes: the electromigration ion transport through the anion-exchange membrane and the chemical reactions of hydrocarbonate ions with the water dissociation products formed on the bipolar and anion-exchange membranes. A mathematical model was suggested to describe the electrodialysis correction of the pH of a dilute chloride-hydrocarbonate solution. The experimental data on the correction of pH of the chloride-hydrocarbonate solution were well approximated by both the model that takes into account water dissociation on the anion-exchange membrane and the simplified model that neglects water dissociation. The experimental data agreed well with the results of calculations by the model in which the effective anion transport numbers were calculated only from ion concentrations and diffusion coefficients in solution. This reflects the outer diffusion character of the kinetics of ion transport through the anion-exchange membrane, with pH of dilute solutions corrected by electrodialysis.

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Authors and Affiliations

  1. Kuban State University, Krasnodar, Russia

    V. I. Zabolotskii, S. V. Utin, K. A. Lebedev, P. A. Vasilenko & N. V. Shel’deshov

Authors
  1. V. I. Zabolotskii
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  2. S. V. Utin
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  3. K. A. Lebedev
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  4. P. A. Vasilenko
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  5. N. V. Shel’deshov
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Corresponding author

Correspondence to S. V. Utin.

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Original Russian Text © V.I. Zabolotskii, S.V. Utin, K.A. Lebedev, P.A. Vasilenko, N.V. Shel’deshov, 2012, published in Elektrokhimiya, 2012, Vol. 48, No. 7, pp. 842–848.

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Zabolotskii, V.I., Utin, S.V., Lebedev, K.A. et al. Study of pH correction process of chloride-bicarbonate dilute solutions by electrodialysis with bipolar membranes. Russ J Electrochem 48, 767–772 (2012). https://doi.org/10.1134/S1023193512070130

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  • DOI: https://doi.org/10.1134/S1023193512070130

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