Abstract Compared to the inorganic nanofillers, an organic one might be more appropriate to control the aggregation and interfacial microvoids between nanofiller and polymeric matrix for an efficient mixed matrix membrane. In this study, a hydrophilic carboxylated covalent organic frameworks (COF-COOH) as an organic nanofiller, for the first time, was conveniently incorporated to fabricate a novel thin-film nanocomposite (TFN) membrane via interfacial polymerization. Thanks to the abundant carboxyl groups and pure organic nature of COF-COOH, the TFN membrane was endowed with an improved hydrophilicity and negative charge property. With COF-COOH content of 0.5 mg ml−1 in aqueous solution, the elaborately designed TFN membrane rendered a smaller mean pore size of 0.45 nm and an ultralow structural parameter of 58.6 μm, exhibiting a 4-fold water flux (Jv) of 64.2 L m−2 h−1 with a synchronously improved selectivity (Jv/Js as high as 10.0 L g−1), compared to a pristine TFC membrane (Jv = 15.9 L m−2 h−1, Jv/Js = 2.6 L g−1) in forward osmosis (FO) mode with 1 mol L−1 NaCl as draw solution and DI water as feed solution. The intriguing results shed light on the potential of COFs in the highly efficient membranes for water desalination and purification.

中文翻译：

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掺杂羧化共价有机骨架的薄膜纳米复合膜用于高效正渗透脱盐

摘要 与无机纳米填料相比，有机纳米填料可能更适合控制纳米填料与聚合物基质之间的聚集和界面微孔，以获得高效的混合基质膜。在这项研究中，亲水性羧化共价有机骨架（COF-COOH）作为有机纳米填料首次被方便地结合使用，通过界面聚合制备新型薄膜纳米复合材料（TFN）膜。由于 COF-COOH 丰富的羧基和纯有机性质，TFN 膜被赋予了改进的亲水性和负电荷特性。水溶液中COF-COOH含量为0.5 mg ml-1时，精心设计的TFN膜呈现出更小的平均孔径0.45 nm和58.6 μm的超低结构参数，与原始 TFC 膜（Jv = 15.9 L m）相比，显示出 4 倍的水通量 (Jv) 为 64.2 L m-2 h-1，同时选择性提高（Jv/Js 高达 10.0 L g-1） -2 h-1, Jv/Js = 2.6 L g-1) 在正向渗透 (FO) 模式下，1 mol L-1 NaCl 作为汲取溶液，DI 水作为进料溶液。有趣的结果揭示了 COF 在用于海水淡化和净化的高效膜中的潜力。