Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 193, Issue -, Pages 11-20Publisher
ELSEVIER
DOI: 10.1016/j.seppur.2017.10.062
Keywords
Anion exchange membrane; Diffusion dialysis; Proton diffusion; Acid recovery
Categories
Funding
- National Natural Science Foundation of China [91534203, 21506200]
- Key Technologies R & D Program of Anhui Province [1501041127]
- K.C. Wong Education Foundation [2016-11]
- CAS-TWAS Presidential Fellowship
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High performance anion exchange membranes (AEM) with proton transport pathways were fabricated through cationic functionalization of bromo-methylated poly (phenylene oxide) (BPPO) by a nucleophile dimethylamino pyridine (DMAP). The reaction was selectively occurred at dimethylamino functionalities of DMAP to form quaternary amine groups. The pyridine groups on DMAP having a dibasic nature promoted the formation of proton transport pathways and contributed to hydrophilicity of the membranes. The obtained membranes had the water uptake (W-U) in the range of 12-57%, the ion exchange capacity (IEC) from 0.84 to 2.07 mmol g(-1), acid dialysis coefficient (U-H) from 0.37 to 20.3 (10(-3) mh(-1)) at 25 degrees C. Interestingly, these membranes exhibited superior separation factor (S) values of 73-351 compared to a commercial DF-120 membrane and most reported membranes in literature. Moreover, the prepared membranes showed excellent thermal, chemical and mechanical stability.
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