膜
界面聚合
纳米复合材料
共价有机骨架
化学工程
海水淡化
材料科学
正渗透
反渗透
薄膜复合膜
水溶液
高分子化学
聚合
共价键
化学
纳米技术
有机化学
聚合物
复合材料
单体
生物化学
工程类
作者
Lei Xu,Tingting Yang,Mingdi Li,Jiaqi Chang,Jia Xu
标识
DOI:10.1016/j.memsci.2020.118111
摘要
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.
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