Abstract The weak base of tertiary amine groups was introduced into poly (2, 6-dimethyl-1, 4-phenylene oxide) (PPO) anion exchange membranes (AEMs) by Cu(I)-catalyzed “click chemistry” in order to fabricate proton blockage membranes for sulfonic acid concentration in electrodialysis (ED). The degree of functionalization has been confirmed quantitatively by 1H NMR spectroscopy. Fourier transform infrared spectroscopy (FTIR) was also used to confirm the functional groups in the membranes matrix. The prepared proton blockage membrane with tertiary ammonium groups showed lesser swelling and water uptake ratios than the typical AEMs with strong organic base of quaternary ammonium groups. It is believed that the strong organic base of quaternary ammonium has a stronger hydration effect on water than that of tertiary amine groups. Interestingly, the concentration limitation of membranes with tertiary amine groups was higher than that of the membrane with quaternary ammonium groups, indicative of the proton blocking capabilities of the AEMs as a result of the weak base introduced into the matrix. Moreover, it was found that the concentration limitation of tertiary amine based AEMs was also influenced by the weight-based ion exchange capacities (IECw), essentially the water uptake and swelling ratios of the membranes. The highest concentration limitation of AEMs with tertiary ammonium groups for H+ was 3.02 mmol/L with IECw value of 1.67 mmol/g, which is slightly higher than the 3.00 mol/L reported for the commercial AEM (Neosepta ACM). Therefore, AEMs containing weak base groups are potential candidates for proton blockage membrane for acid recovery applications by ED process.

中文翻译：

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用于在电渗析中浓缩磺酸的带有叔胺基团的质子阻断膜

摘要 通过 Cu(I) 催化的“点击化学”将叔胺基团的弱碱引入聚 (2, 6-二甲基-1, 4-苯醚) (PPO) 阴离子交换膜 (AEMs) 以制备用于电渗析 (ED) 中磺酸浓度的质子阻断膜。官能化程度已通过 1 H NMR 光谱定量证实。傅里叶变换红外光谱 (FTIR) 也用于确认膜基质中的官能团。制备的具有叔铵基团的质子阻挡膜比具有季铵基团的强有机碱的典型 AEM 显示出更小的溶胀和吸水率。认为季铵的强有机碱对水的水合作用比叔胺基团更强。有趣的是，具有叔胺基团的膜的浓度限制高于具有季铵基团的膜的浓度限制，表明由于引入基质中的弱碱，AEM 具有质子阻断能力。此外，发现基于叔胺的 AEM 的浓度限制也受基于重量的离子交换容量 (IECw) 的影响，主要是膜的吸水率和溶胀率。具有叔铵基团的 AEM 对 H+ 的最高浓度限制为 3.02 mmol/L，IECw 值为 1.67 mmol/g，略高于商业 AEM (Neosepta ACM) 报告的 3.00 mol/L。因此，含有弱碱基团的 AEM 是通过 ED 工艺进行酸回收应用的质子阻断膜的潜在候选者。