@article{Yang2023, 
author = {Hongxin Yang and Noor Ul Afsar and Qian Chen and Xiaolin Ge and Xingya Li and Liang Ge and Tongwen Xu},
title = {Poly(alkyl-biphenyl pyridinium) anion exchange membranes with a hydrophobic side chain for mono-/divalent anion separation},
year = {2023},
journal = {Industrial Chemistry & Materials},
volume = {1},
number = {1},
pages = {129-139},
keywords = {Superacid-catalyzed polymerization, Anion exchange membrane, Mono-/divalent anion separation, Electrodialysis, Permselectivity},
url = {https://www.sciopen.com/article/10.1039/d2im00043a},
doi = {10.1039/d2im00043a},
abstract = {A series of poly(alkyl-biphenyl pyridinium) anion exchange membranes (AEMs) with a hydrophobic side chain were prepared for mono-/divalent anion separation using electrodialysis (ED). A poly(alkyl-biphenyl pyridinium) polymer was synthesized via superacid-catalyzed polymerization, and then quaternization was conducted using Menshutkin reactions with 1-bromopentane. The obtained quaternized product had excellent solubility in common organic solvents, making it flexible to form homogeneous membranes by a solution casting method. The introduction of a hydrophobic side chain resulted in a microphase separation structure in the membrane, which is favorable to the active transport of Cl− (higher Cl− flux of up to 3.37 mol m−2 h−1 at a 10 mA cm−2 current density) compared with that of SO42− ions giving a high permselectivity of 11.9 in a mixed salt (NaCl/Na2SO4) system. In addition, the prepared membrane exhibited excellent alkaline stability in successive ED tests. It showed an OH− flux of up to 3.6 mol m−2 h−1 with a permselectivity of 361.2 between OH− and WO42−, which is much higher than that of Neosepta ACS membrane. The ED results manifest that the poly(alkyl-biphenyl pyridinium) AEMs can be promising candidates for practical mono-/divalent anion separation in industry.}
}