Advanced charged porous membranes with ultrahigh selectivity and permeability for acid recovery

In this work, a novel approach is explored to achieve a combination of separation performance and a suitable membrane fabrication procedure for anion exchange membranes (AEMs). Porous brominated poly(2,6- dimethyl1,4- phenylene oxide) (BPPO) membranes with tunable morphologies were prepared exclusively via the nonsolvent induced phase separation technique (NIPS) and were investigated for acid recovery via the diffusion dialysis (DD) technique. The physiochemical and electrochemical properties of the prepared membranes were well characterized and could be adjusted according to their porous structure. The prepared membranes displayed outstanding thermo-mechanical stability. At 25 degrees C, the proton dialysis coefficient values were between 0.015 m h(-1) and 0.020 m h(-1), whereas the separation factor values ranged from 81 to 665 for the HCl/FeCl2 system. For the HCl/AlCl3 system, an even better result was achieved. The proton dialysis coefficient values for the HCl/AlCl3 system were between 0.022 m h(-1) and 0.028 m h(-1) and the separation factor values ranged from 100 to 2033. The obtained values were 4- 36 times higher than those of the commercial DF-120 membrane under the same operating conditions. The exceptional and facile preparation procedure of our newly prepared DD membranes show the potential of these membranes to serve as promising candidates for use in the highefficiency industrial acid recovery processes.