Abstract
In this study, we prepared novel PVA-based anion-exchange membranes with monovalent anion permselectivity by coating one of the membrane surfaces with an aqueous solution of PVA-based block copolymers. To determine the permselectivity between Cl－ ions and SO42－ ions through the membrane, electrodialysis was carried out using a mixed NaCl and Na2SO4 solution. The permselectivity for Cl－ ions against SO42－ ions through the membrane increased with increasing coating solution concentration while membrane resistance was almost independent of the coating solution concentration. Also, a coating layer having a higher amount of charge group showed higher permselectivity. These results indicate that our modification method can be used to prepare a membrane with high permselectivity for monovalent anions without changing its membrane resistance.
