One-Step Fabrication of Methylthiazole-Functionalized Anion Exchange Membranes for Diffusion Dialysis

Anion exchange membranesusing brominated poly(2,6-dimethyl-1,4-phenylene oxide) (BPPO) as starting material were prepared from one-step functionalization by 4-methylthiazole (MTz). The obtain membranes with high thermal stability and mechanical strength showed satisfied diffusion dialysis performance for acid recovery. Specifically, when the optimal membrane was evaluated to recover acid from the simulated iron polishing waste solution (1.0 mol·L-1 FeCl2 + 0.2 mol·L-1 HCl), its acid diffusion coefficient (UH+) was 0.019 m h-1 and separation factor was 40.1 at 25°C, both of these two parameters are much higher than the corresponding values of the commercial DF-120 membrane, suggesting the great potential in the practical application for acid recovery.