Anion-exchange membranes for separation of borates by Donnan dialysis

摘要

Preparation and properties of anion-exchange membranes for Donnan dialysis of borates were described. It was shown that grafting of polyethyleneimine to surface of Gelgard 2500 membrane resulted in preparation of well-permeable membranes. Fluxes of NaCl and Na2SO4 through new membranes were larger than flux of the same salts across commercial FumaTech anion-exchange membranes. However, the collapse of polyethyleneimine chains, generated by higher ionic strength of solution, caused poor selectivity of the grafted membranes and their malfunctioning in the Donnan dialysis process.