Preparation of pyrrolidinium-based anion-exchange membranes for acid recovery via diffusion dialysis. Issue 11 (23rd July 2016) - Khan, Muhammad Imran
ABSTRACT: In this manuscript, the preparation of pyrrolidinium-based anion-exchange membranes (AEMs) from brominated poly(2, 6-dimethyl-1, 4-phenyleneoxide) (BPPO) is reported. Prepared membranes were completely characterized in terms of Fourier transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), scanning electron microscopy (SEM), atomic force microscopy (AFM), ion-exchange capacity (IEC), water uptake (WR ), linear expansion ratios (LER), mechanical stability, acid stability, etc. Excellent thermal, mechanical and acid stability can be observed for prepared membranes. Prepared membranes were used in diffusion dialysis (DD) process for acid recovery from model waste HCl/FeCl2 solution. The dialysis coefficient of HCl ( U H ) is found to be in the range of 0.018–0.049 m/h, whereas the separation factor ( S ) was obtained as 36.24–66.39. Prepared membranes show much better DD performance than that of commercial fibre–supported DF-120B membrane (0.004 m/h for U H, 24.3 for S at 25°C). Prepared membranes got the potential to be used as a promising candidate for acid recovery via DD.