NDLI: Influence of the nature of membrane ionogenic groups on water dissociation and electrolyte ion transport: A rotating membrane disk study

Content Provider	Springer Nature Link
Author	Zabolotskii, V. I. Sharafan, M. V. Shel’deshov, N. V.
Copyright Year	2008
Abstract	Polarization properties of electromembrane systems (EMS) consisting of a heterogeneous membrane, either the MK-41 phosphonic acid membrane or the MK-40 sulfonic acid membrane, and dilute sodium chloride solutions are investigated with the rotating membrane disk method. For the MK-41/0.01 M NaCl and MK-41/0.001 M NaCl EMS, effective ion transport numbers and partial current-voltage curves (CVC) are measured for sodium and hydrogen ions, and limiting-current densities and the diffusion-layer thickness are calculated as functions of the rotation rate of the membrane disk. With the theory of the overlimiting state of EMS, internal parameters of the systems under investigation—the diffusion-layer thickness, the space-charge distribution, and electric-field strengths in the diffusion layer and in the membrane—are calculated from experimentally obtained CVC and the dependence of effective transport numbers on current density. The catalytic influence of ionogenic groups on the dissociation rate of water is analyzed quantitatively. Partial CVC for H$^{+}$ ions are calculated for the space-charge region in MK-40 and MK-41 membranes. Analogous CVC for bipolar membranes containing sulfonic acid and phosphonic acid groups are compared. The dissociation mechanism of water is the same in all EMS and is independent of the membrane type and the nature of the functional groups.
Starting Page	1127
Ending Page	1134
Page Count	8
File Format	PDF
ISSN	10231935
Journal	Russian Journal of Electrochemistry
Volume Number	44
Issue Number	10
e-ISSN	16083342
Language	English
Publisher	SP MAIK Nauka/Interperiodica
Publisher Date	2008-10-28
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	electric mass transfer rotating membrane disk ionogenic groups water dissociation Physical Chemistry Electrochemistry
Content Type	Text
Resource Type	Article
Subject	Electrochemistry

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