Surface modification of anion exchange membranes (AEMs) by attaching a negatively charged layer is the main method for preparing monovalent anion selective membranes. However, tremendous increase of membrane resistance and poor long-term stability of the modified membranes face great challenges. In this work, a photosensitive molecule (4,4-diazostilbene-2,2-disulfonic acid disodium salt [DAS]) was infiltrated into the membrane surface and immobilized in the structure by cross-linking under UV irradiation. This method introduced negative charge to the surface layer of the AEMs without increasing membrane thickness, leading to high performance membrane with high monovalent anion selectivity. The optimized membrane (D-5) shows the highest perm-selectivity of 11.21, which is superior to the commercial selective membrane Selemion^® ASV and previously reported monovalent anion selective AEMs. Furthermore, the newly developed membrane exhibits excellent long-term stability, which can maintain constant selectivity during the 80 h ED experiment. © 2017 American Institute of Chemical Engineers AIChE J, 2017

中文翻译：

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通过渗透和光交联来修饰AEM的表面层以诱导单价选择性

通过附着带负电的层对阴离子交换膜（AEM）进行表面改性是制备单价阴离子选择性膜的主要方法。然而，膜电阻的极大增加和改性膜的长期稳定性差，面临着巨大的挑战。在这项工作中，光敏分子（4，4-重氮基-2，2-二磺酸二钠盐[DAS]）渗透到膜表面，并通过在紫外线照射下交联而固定在结构中。该方法在不增加膜厚度的情况下将负电荷引入了AEM的表面层，从而导致具有高一价阴离子选择性的高性能膜。优化的膜（D-5）显示出最高的选择性（11.21），优于商业选择性膜Selemion^® ASV和以前报道的一价阴离子选择性的AEM。此外，新开发的膜具有出色的长期稳定性，可以在80 h ED实验中保持恒定的选择性。©2017美国化学工程师学会AIChE J，2017