Abstract
Acids permeate easily through an anion exchange membrane with a concentration gradient. In order to drecrease the rate of acid permeation through the anion exchange membrane, a composite membrane was prepared from the anion exchange membrane and conducting polymers by chemical oxidation polymerization. The diffusion coefficient of hydrochloric acid decreased remarkably by the formation of polypyrrole in the membrane matrix. The current efficiency of hydrochloric acid in electrodialytic concentration of the acid was also markedly improved by polypyrrole formation. Various kinds of anion exchange membranes were used in the measurements and a similar effect of polypyrrole on membrane performance was observed. Micrograph analysis revealed that polypyrrole existed on the membrane surfaces as layers when ferric chloride was used as oxidant, and that it was homogeneously distributed in the membrane matrix when ammonium peroxodisulfate was used.
Published Version
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