Poly(alkyl-biphenyl pyridinium) anion exchange membranes with a hydrophobic side chain for mono-/divalent anion separation†

Industrial Chemistry & Materials Pub Date : 2023-01-04 DOI:10.1039/D2IM00043A

Hongxin Yang, Noor Ul Afsar, Qian Chen, Xiaolin Ge, Xingya Li, Liang Ge and Tongwen Xu

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引用次数: 4

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.

Keywords: Superacid-catalyzed polymerization; Anion exchange membrane; Mono-/divalent anion separation; Electrodialysis; Permselectivity.

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具有疏水侧链的聚(烷基联苯吡啶)阴离子交换膜，用于单/二价阴离子分离

制备了一系列疏水侧链聚烷基联苯吡啶阴离子交换膜(AEMs)，用于电渗析(ED)分离单/二价阴离子。采用超强酸催化聚合法制备了聚烷基联苯吡啶聚合物，并与1-溴戊烷通过Menshutkin反应进行季铵化反应。所制得的季铵化产物在普通有机溶剂中具有优异的溶解度，通过溶液浇铸法可灵活形成均质膜。疏水侧链的引入使膜内形成了微相分离结构，这有利于Cl -离子的主动迁移(在10 mA cm - 2电流密度下Cl -通量高达3.37 mol m - 2 h - 1)，在混合盐(NaCl/Na2SO4)体系中具有11.9的高过电选择性。此外，制备的膜在连续的ED测试中表现出良好的碱性稳定性。OH -通量高达3.6 mol m−2 h−1,OH -和WO42−之间的选择性为361.2，远高于Neosepta ACS膜。结果表明，聚烷基联苯吡啶AEMs可用于工业上的一价/二价阴离子分离。关键词:超强酸催化聚合;阴离子交换膜;单/二价阴离子分离;电渗析;选择通透性。

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