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Mixed-charge poly(2,6-dimethyl-phenylene oxide)anion exchange membrane for diffusion dialysis in acid recovery
Journal of Membrane Science ( IF 8.4 ) Pub Date : 2018-03-01 , DOI: 10.1016/j.memsci.2017.12.054
Liang Wang , Fan Zhang , Zhenxing Li , Jiayou Liao , Yingda Huang , Yinlin Lei , Nanwen Li

Abstract In order to achieve high H+ dialysis coefficients and highly selective of anion exchange membranes (AEMs) for diffusion dialysis (DD) in acid recovery applications, a series of mixed-charge PPO AEMs with quaternary ammonium(QA) and carboxylic acid groups were synthesized quantitatively via Cu(I)-catalysed “click chemistry”. In diffusion dialysis, using an acidic solution (HCl, 1 mol/L; FeCl2, 0.2 mol/L) as a simulated waste solution indicated that the as-obtained mixed-charge PPO AEMs displayed higher H+ dialysis coefficients and a higher H+/Fe2+ selectivity over that of typical AEMs despite their increased water uptake and lower volumetric IECv values. The highest H+ dialysis coefficients, 0.021 m/h, and H+/Fe2+ selectivity 34.52, membranes were achieved with PPO-X35Y20 at 30 °C. These values were much higher than that of the PPO-X40 membrane without carboxylic acid groups. Importantly, unlike previously reported AEMs for DD in which the H+/Fe2+ selectivity decreased as the IECw increased, (i.e., a trade-off effect between the UH+ and selectivity), the high IECw of the mixed-charge PPO AEMs tended to result in not only high H+ dialysis coefficients but also high H+/Fe2+ selectivities. It is assumed that the carboxylic acid groups in AEMs likely enhance the dialysis of H+ by the ion changing and hydrogen-bonding more with H+ than Fe2+, thus, cancelling out the ‘trade-off’ effect in DD for acid recovery.

中文翻译:

用于酸回收扩散渗析的混合电荷聚(2,6-二甲基-苯醚)阴离子交换膜

摘要 为了在酸回收应用中实现高 H+ 渗析系数和高选择性阴离子交换膜 (AEMs) 用于扩散渗析 (DD),合成了一系列具有季铵 (QA) 和羧酸基团的混合电荷 PPO AEMs。通过Cu(I)催化的“点击化学”定量。在扩散透析中,使用酸性溶液(HCl,1 mol/L;FeCl2,0.2 mol/L)作为模拟废液表明,所获得的混合电荷 PPO AEMs 显示出更高的 H+ 透析系数和更高的 H+/Fe2+尽管它们的吸水率增加和体积 IECv 值较低,但它们的选择性高于典型 AEM。最高的 H+ 透析系数为 0.021 m/h,H+/Fe2+ 选择性为 34.52,使用 PPO-X35Y20 在 30 °C 下实现了膜。这些值远高于不含羧酸基团的 PPO-X40 膜的值。重要的是,与先前报道的 DD 的 AEM 不同,其中 H+/Fe2+ 选择性随着 IECw 的增加而降低(即 UH+ 和选择性之间的权衡效应),混合电荷 PPO AEM 的高 IECw 倾向于导致不仅具有高 H+ 透析系数,而且具有高 H+/Fe2+ 选择性。假设 AEM 中的羧酸基团可能通过离子改变和与 H+ 的氢键而不是 Fe2+ 来增强 H+ 的透析,从而抵消了 DD 中酸回收的“权衡”效应。混合电荷 PPO AEM 的高 IECw 不仅会导致高 H+ 透析系数,还会导致高 H+/Fe2+ 选择性。假设 AEM 中的羧酸基团可能通过离子改变和与 H+ 的氢键而不是 Fe2+ 来增强 H+ 的透析,从而抵消了 DD 中酸回收的“权衡”效应。混合电荷 PPO AEM 的高 IECw 不仅会导致高 H+ 透析系数,还会导致高 H+/Fe2+ 选择性。假设 AEM 中的羧酸基团可能通过离子改变和与 H+ 的氢键而不是 Fe2+ 来增强 H+ 的透析,从而抵消了 DD 中酸回收的“权衡”效应。
更新日期:2018-03-01
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