Abstract Anion exchange membranes (AEMs) with high monovalent/multivalent anion perselectivity are essential for wide range applications (e.g., electrodialysis (ED)). In this work, we have proposed a facile surficial adhesive modification process to fabricate a highly permselective AEM for ED application. Firstly, a novel sulfonated dopamine (SDA) adhesive was synthesized, followed by coating this kind of polymer-like adhesive on commercial AEMs under alkaline and aerobic conditions. We have found that the SDA coating can significantly enhance the monovalent permselectivity (Cl-/SO42-), with a permselectivity of 34.02, which is much higher than the corresponding values of dopamine (DA)modified AEM (i.e., 11.59) and of the pristine AEM (i.e., 1.00). In addition, fouling experiments show that the transition time (the point time in fouling experiment when a voltage dramatically increases; that's to say, foulant dramatically occurs) of the optimum membrane is 112 min, indicating the superior anti-fouling property of SDA modified AEM, compared with pristine AEM (76 min). The facile fabrication process and superior performance of modified AEM suggest that as-prepared is potentially applicable in ED for separation of monovalent and multivalent anions.

中文翻译：

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以贻贝为灵感的阴离子交换膜磺化聚多巴胺涂层提高渗透选择性和防污性能

摘要 具有高单价/多价阴离子选择性的阴离子交换膜 (AEM) 对于广泛的应用（例如电渗析 (ED)）至关重要。在这项工作中，我们提出了一种简便的表面粘合剂改性工艺，以制造用于 ED 应用的高选择性 AEM。首先，合成了一种新型磺化多巴胺 (SDA) 粘合剂，然后在碱性和有氧条件下将这种类聚合物粘合剂涂覆在商用 AEM 上。我们发现 SDA 涂层可以显着提高单价渗透选择性 (Cl-/SO42-)，渗透选择性为 34.02，远高于多巴胺 (DA) 修饰的 AEM 的相应值（即 11.59）和原始 AEM（即 1.00）。此外，污垢实验表明，最佳膜的过渡时间（污垢实验中电压急剧升高时的点时间，即污垢急剧发生）为112 min，表明SDA改性AEM具有优越的防污性能。原始 AEM（76 分钟）。改性 AEM 的简易制造工艺和卓越性能表明，所制备的材料可能适用于 ED 以分离单价和多价阴离子。