Studies with Model Membrane: Determination of Fixed Charge Density of Silver Sulfite Membrane
American Journal of Polymer Science and Technology
Volume 2, Issue 2, November 2016, Pages: 28-33
Received: Sep. 17, 2016; Accepted: Nov. 10, 2016; Published: Dec. 5, 2016
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Authors
Khaled Muftah Elsherif, Chemistry Department, Faculty of Science, University of Benghazi, Benghazi, Libya
Maisson Mohammed Yaghi, Chemistry Department, Faculty of Arts and Science, University of Benghazi, Benghazi, Libya
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Abstract
Parchment-supported silver sulfite membrane has been prepared by the interaction method. The membrane potential across the membrane in contact with different 1:1 electrolytes has been measured. The experimentally measured membrane potential values were used to evaluate the thermodynamically effective fixed charge density of the membrane-electrolyte systems using Teorell, Meyer, and Sievers (T. M. S.), Altug and Hair, and Kobatake et. al. theories. The values of effective charge densities were quite low (they were in order of 10-2 – 10-3 eq/l) and hence very difficult to determine by usual exchange methods. The values of effective charge densities by different theories were the same order of magnitude for each membrane-electrolyte system. The theoretical predictions for membrane potential were borne out quite satisfactorily by experimental results obtained with the membranes. Apparent transference numbers of coions and permselectivity values of the membrane-electrolytes have also been calculated. A method based on permselectivity values for determination of charge density was also used. It was interesting to note that the charge densities evaluated from two methods of Kobatake and co-workers gave similar values and that the results were comparable to those derived from the TMS method.
Keywords
Membrane Potential, Fixed Charge Density, Permselectivity, Parchment Supported Membrane
To cite this article
Khaled Muftah Elsherif, Maisson Mohammed Yaghi, Studies with Model Membrane: Determination of Fixed Charge Density of Silver Sulfite Membrane, American Journal of Polymer Science and Technology. Vol. 2, No. 2, 2016, pp. 28-33. doi: 10.11648/j.ajpst.20160202.12
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Copyright © 2016 Authors retain the copyright of this article.
This article is an open access article distributed under the Creative Commons Attribution License (http://creativecommons.org/licenses/by/4.0/) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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