Augmenting acid recovery from different systems by novel Q-DAN anion exchange membranes via diffusion dialysis
Muhammad Irfan, Erigene Bakangura, Noor Ul Afsar, Jin Ran, Tongwen Xu
Index: 10.1016/j.seppur.2018.02.042
Full Text: HTML
Abstract
Improving acid recovery through controlling the properties of anion exchange membranes have become a major bottle-neck to forward the membrane based separation and purification technologies. Herein, we report the performances of novel anion exchange membranes and the effect of multivalent metal ions on membrane performance. A novel AEM was prepared from two steps. Initially, the quaternization of 1,5-diaminonaphthalene (Q-DAN) was successfully done with the initiator 2,3-epoxypropyltrimethylammonium chloride to obtain the desired polymer Q-DAN structure as confirmed by proton NMR. Then, the charged membrane matrix is obtained by classical sol-gel process from PVA, TEOS, and Q-DAN. The influences of Q-DAN and multivalent metal ions on acid recovery were explored in detail. At 25 oC, the acid dialysis coefficients (UH) values for FeCl2-HCl system are in between 0.0194–0.0295 m/h and separation factors are ranged from 27.84 to 52.60. Membrane Q-DAN-4 was selected to investigate the effects of multivalent metal ions on diffusion dialysis. The results showed that the presence of different metal salts in hydrochloric acid solution affected the membrane diffusivity and selectivity in diffusion dialysis process due to complexation of metal ions and acid.