Anion exchange membranes from hot-pressed electrospun QPPO–SiO2 hybrid nanofibers for acid recovery

Abstract To improve the efficiency of acid recovery by diffusion dialysis, novel anion exchange membranes (AEMs) have been fabricated from quaternized poly(2,6-dimethyl-1,4-phenylene oxide)/Silicon dioxide hybrid material (QPPO–SiO 2 ) by electrospinning and post-treatment (solvent fumigation and hot-press). While being used in a simulated iron polishing waste solution containing 1 mol/L HCl, and 0.225 mol/L FeCl 2 , the membrane exhibits both higher acid permeability ( U H , 0.053 m/h) and selectivity ( S , 68.05) in comparison with the direct casting QPPO–SiO 2 hybrid membrane, of which possess relatively lower values of U H (0.041 m/h) and S (49.45). Besides, compared with commercial DF-120 membrane ( U H =0.005–0.009 m/h, and S =18.5–23.5), hot-pressed electrospun QPPO–SiO 2 membrane shows more than approx.7 times higher U H and approx.3 times higher S values underling its advantage in DD application.

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