Mono-valent selective ion-exchange membrane, as the core component of selective electrodialysis (SED), has received extensive attention. In this work, we report a mono-valent selective anion-exchange membrane (AEM), which was fabricated with distorted poly(aryl ether sulfone) and decorated with bifunctional side-chains providing anion exchange groups and hydrophobic segments. By tuning the length of the hydrophobic side-chains, the nanophase separation within AEMs was finely tuned, evidenced by an ionic cluster size of about 0.47 nm from SAXS analysis. The optimized AEM (PAES-TA-7 AEM) shows a very low water swelling ratio of 6.4 %, signaling good dimensional stability. The perm-selectivity () of PAES-TA-7 AEM during ED reached 107 at 2.5 mA∙cm (ion flux: 2.69 × 10 mol cm s at 90 min) significantly exceeding that of the commercial Neosepta ACS (11; 2.08 × 10 mol cm s). It is inferred that the ion channels, resulting from nanophase separation between the side-chains and the backbone, as well as the free volume cavity created by the distorted backbone, significantly contribute to the smooth transport of the Cl ions through the AEM with less resistance. As a result, it is believed that this work offers a useful strategy to advance the monovalent anion-selective membranes.

中文翻译：

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双功能侧链修饰扭曲的聚芳醚砜主链，赋予阴离子交换膜对氯离子高渗透选择性


一价选择性离子交换膜作为选择性电渗析（SED）的核心部件，受到广泛关注。在这项工作中，我们报道了一种单价选择性阴离子交换膜（AEM），它由扭曲的聚（芳基醚砜）制成，并用提供阴离子交换基团和疏水链段的双功能侧链装饰。通过调节疏水侧链的长度，AEM 内的纳米相分离得到了微调，SAXS 分析显示离子簇尺寸约为 0.47 nm。优化后的 AEM (PAES-TA-7 AEM) 具有 6.4% 的极低水膨胀比，表明具有良好的尺寸稳定性。在 ED 期间，PAES-TA-7 AEM 的渗透选择性 () 在 2.5 mA∙cm 下达到 107（离子通量：90 分钟时为 2.69 × 10 mol cm s），显着超过商用 Neosepta ACS (11; 2.08 × 10摩尔·厘米·秒）。据推测，侧链和主链之间的纳米相分离产生的离子通道，以及扭曲的主链产生的自由体积空腔，极大地促进了 Cl 离子以较小的阻力通过 AEM 的平稳传输。 。因此，我们相信这项工作为推进单价阴离子选择性膜提供了一种有用的策略。