Abstract Fouling of anion exchange membranes (AEMs) is the bottleneck restricting electrodialysis technology, and surface modification is an effective way to solve this problem. This paper investigated the effects of different components such as single poly (sodium 4-styrene sulfonate) (PSS), single polydopamine (PDA) and mixed polydopamine and poly (sodium 4-styrene sulfonate) (PDA@PSS) used as the modifier, respectively, on the surface properties and antifouling performance of AEMs. Comparing the surface properties of different modified AEMs, it was found that the surface hydrophilicity and negative charge density of PDA@PSS modified AEM (PDA@PSS-M) were obviously improved due to the combined action of PDA and PSS. The desalination rate, surface morphology and relative content of surface S element of different AEMs after the fouling experiments were also analyzed. The results indicated that PDA@PSS-M presented the greatest antifouling performance among three modified AEMs. The effect of PDA@PSS co-deposited layer on its desalination performance was negligible and the modification layer had relatively good stability.

中文翻译：

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聚多巴胺与聚（4-苯乙烯磺酸钠）改性阴离子交换膜的性能及防污性能

摘要 阴离子交换膜（AEMs）污染是制约电渗析技术的瓶颈，表面改性是解决这一问题的有效途径。本文研究了不同组分如单一聚（4-苯乙烯磺酸钠）（PSS）、单一聚多巴胺（PDA）和混合聚多巴胺和聚（4-苯乙烯磺酸钠）（PDA@PSS）作为改性剂的效果，分别对 AEMs 的表面性质和防污性能进行了研究。比较不同改性AEMs的表面性质，发现PDA@PSS改性AEM（PDA@PSS-M）的表面亲水性和负电荷密度由于PDA和PSS的共同作用而明显提高。海水淡化率，还分析了污垢实验后不同AEMs的表面形貌和表面S元素的相对含量。结果表明，PDA@PSS-M 在三种改性 AEM 中表现出最好的防污性能。PDA@PSS共沉积层对其脱盐性能的影响可以忽略不计，改性层具有较好的稳定性。