纳滤
膜
化学工程
共价有机骨架
化学
污染物
纳米孔
多孔性
膜技术
溶剂
材料科学
有机化学
生物化学
工程类
作者
Tongfan Chen,Bin Li,Wenbo Huang,Chunhui Lin,Guangshe Li,Hao Ren,Yue Wu,Shuhui Chen,Wenxiang Zhang,Heping Ma
标识
DOI:10.1016/j.seppur.2020.117787
摘要
Organic pollutants are biological toxicity and should be removed from the environment. Membrane separation offers several advantages in organic pollutants removal such as high pollutants selectivity and high solvent permeability. Covalent organic framework membrane is regarded as an emerging porous membrane for nanofiltration owing to their permanent porosity and well-defined pore structure in various organic media. Herein, a self-standing 2D sulfonate anionic COF membrane with nanometer pore size and -SO3Na groups has been successfully prepared. The surface charge combines with nanopore sieving property endow the COF membrane high nanofiltration separation performances and charge-controlled organic molecular separation. The anionic membrane can effectively intercept > 99% of cationic organic pollutants, while maintaining excellent solvent permeability due to its rigid porous structure and high porosity. The density functional theory (DFT) calculation provides further understanding on the charge-controlled separation in ionic nanoporous membranes. Our work may open up a new avenue for developing charged COF membrane for nanofiltration and organic pollutants separation applications.
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