Sodium chloride concentration by electrodialysis with hybrid organic-inorganic ion-exchange membranes: An investigation of the process |
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Authors: | V I Zabolotskii K V Protasov M V Sharafan |
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Institution: | 1.Kuban State University,Krasnodar,Russia |
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Abstract: | This study examines how conditions for modifying homogeneous MF-4SK and heterogeneous MK-40 membranes with tetraethoxysilane
affect membrane properties. The microstructure of the bulk membrane and its surface, both before and after exposure to the
modifying agent, is examined by scanning electron microscopy, spark spectrophotometry, and standard contact porosimetry. The
process of sodium chloride concentration by electrodialysis with hybrid organic-inorganic membranes in cells with noncirculating
concentration compartments is investigated, and a mathematical model of the concentration process by electrodialysis is used
to determine transport properties: current efficiency, diffusion and osmotic permeabilities, and the salt hydration number.
For highly hydrophilic membranes, it is shown that water transport occurs both in ion hydration shells and also as free water.
It is established that after modified membranes undergo additional heat treatment, the transport of free water ceases, and
the water transport number decreases. This is in accord with an increase in the salt content of the concentrate during concentration
by electrodialysis. |
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