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Kovalev Nikita Vladimirovich

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• Kuban State University
 
 

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TOP5 co-authors

• Sheldeshov N. V. ²
• Zabolotskiy V. I. ²
• Alpatova N. V. ¹
• Lebedev K. A. ¹
• Akimova A. V. ¹

Articles count: 2

Сформировать список работ, опубликованных в Научном журнале КубГАУ

• pdf  310.935kb doc 310.935kb Views: 1495 Date: 30.12.2015
  Sheldeshov N. V. Zabolotskiy V. I. Akimova A. V. Kovalev N. V.

  INFLUENCE OF ORGANIC SOLVENTS ON WATER DISSOCIATION IN BIPOLAR MEMBRANE

  02.00.00 Chemical sciences

  Description

  The article discusses results of experimental research of the influence of aprotic and proton solvents on reaction rate of water molecules dissociation in the bipolar membrane MB-1 by the method of electrochemical impedance frequency spectrum. It was discovered, that addition of organic component in aqueous solutions results in significant influence on the parameters of water dissociation in a bipolar region of the membrane. The reason for this influence is the reduction of the mass fraction of water in solution and, consequently, in a bipolar region of the membrane, which itself reduces the rate of the dissociation reaction. Another reason for the influence of the organic solvent is its effect on the network of hydrogen bonds existing in water and aqueous solutions. Depending on the nature of organic solvent and its concentration, the network of hydrogen bonds may be strengthened, or destroyed, thus facilitating removal of the proton involved in the reactions between water molecules and catalytic centers in cation-exchange and anion-exchange layer of bipolar membrane, or retarding removal of proton. This leads respectively to speed up or slow down the rate of dissociation in the bipolar region of the membrane, as well as changing the constants of the dissociation reaction of water. Introduction of organic solvent in solutions, which are in the contact with bipolar membrane, is a convenient method of investigating the role of solution composition on the rate of proton transfer between water molecules and catalytic centers in the membranes

• pdf  304.615kb doc 304.615kb Views: 1213 Date: 30.12.2014
  Sheldeshov N. V. Zabolotskiy V. I. Lebedev K. A. Alpatova N. V. Kovalev N. V.

  STRUCTURE OF SPACE CHARGE REGION AT BIPOLAR JUNCTION AND DISSOCIATION OF WATER MOLECULES IN BIPOLAR MEMBRANE MODIFIED BY CHROMIUM(III) COMPOUND

  02.00.00 Chemical sciences

  Description

  In the article the mathematical model of the space charge region in the bipolar membrane is considered. The structure of the space charge region under passing of electric current, and without electric current is discussed. The results of experimental studies of water dissociation in the bipolar membrane in the presence of chromium(III) are discussed