Zwitterionic Ion-Selective Membranes with Tunable Subnanometer Pores and Excellent Fouling Resistance
Zwitterionic Ion-Selective Membranes with Tunable Subnanometer Pores and Excellent Fouling Resistance
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DOI：
10.1021/acs.chemmater.1c00374
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发表时间：
2021-06-04
影响因子：
8.6
通讯作者：
Asatekin, Ayse
中科院分区：
文献类型：
--
作者：
Lounder, Samuel J.;Asatekin, Ayse
纳滤（NF）膜是一种用于水处理和再利用的节能、可扩展技术。然而，它们易于结垢并且在离子之间提供有限的选择性，阻碍了它们在水回收和再利用中的使用。这项工作利用可扩展的自组装的两性离子共聚物结合了一种新的交联方法，以开发膜区分特殊的单/二价离子的选择性，可调的孔径，并完全抵抗不可逆的污垢。延长的交联将孔径减小至类似于0.9 nm，这是迄今为止自组装共聚物膜报道的最小孔径。这些膜实现了>99.2%的SO 42-截留率和101的Cl-/SO 42-选择性，证明了它们在节能硫酸盐去除和其他水处理应用中的前景。
Nanofiltration (NF) membranes are an energy-efficient, scalable technology for water treatment and reuse. However, they are prone to fouling and offer limited selectivity between ions, hampering their use in water recovery and reuse. This work utilizes scalable self-assembly of zwitterionic copolymers combined with a novel cross-linking approach to develop membranes distinguished by exceptional mono/divalent ion selectivity, tunable pore size, and complete resistance to irreversible fouling. Extended cross-linking reduces the pore size to similar to 0.9 nm, the smallest pore size reported for self-assembled copolymer membranes to date. These membranes achieve >99.2% SO42- rejection and a Cl-/SO42- selectivity of 101, demonstrating their promise for energy-efficient sulfate removal and other water treatment applications.