Active and selective transport of alkali metal ions through a polyelectrolyte complex membrane consisting of glycol chitosan and the sulfate of poly(vinyl alcohol).

概要

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Polyelectrolyte complex (PEC) membranes consisting of glycol chitosan and the sulfate of poly(vinyl alcohol) have been prepared. The membrane of the polyelectrolyte complex under a 50% humidity prepared in a 4% hydrochloric acid solution was stable in basic and acidic solutions. The membranes of the PECs under a 90% humidity prepared at pH 1.0 were not stable in an alkaline solution. The active and selective transport of K+ and Na+ were observed in the PEC membrane prepared in a 4% hydrochloric acid solution. The transport behavior of alkali metal ions through this membrane was much affected by the hydrogen-ion concentration, which acted as a driving force. A proton-pump mechanism was suggested for the acive transport of Na+ and K+. It was also suggested that the affinity of the carrier and changes in both the chemical and physical properties of the PEC membrane with the hydrogen-ion concentration controlled the selective transport through the membrane.
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