膜
聚丙烯腈
阳离子聚合
共价键
化学工程
材料科学
超滤(肾)
离子交换
共价有机骨架
亚胺
高分子化学
离子
聚合物
有机化学
色谱法
化学
催化作用
工程类
生物化学
作者
Chao Yang,Linxiao Hou,Zhikan Yao,Jingjing Zhao,Li’an Hou,Lin Zhang
标识
DOI:10.1016/j.memsci.2021.119800
摘要
The cationic covalent organic frameworks (COFs) with editable pore environment and pore size are promising candidates for constructing the ion channel of anion exchange membranes (AEMs) with excellent separation properties, but the high reversible linking bond (e.g. imine) makes these membranes unstable in the industrial applications. In this work, the keto-linked COF (TpTGCl) with high acid-stability was fabricated on the surface of carboxyl-modified polyacrylonitrile (CPAN) ultrafiltration membrane. The COF active layer with positively charged property in pore channels afforded high separation factor of H+/Fe2+ up to 450 under batch dialysis process. Owing to the electrostatic repulsion, the cationic nanopore demonstrated a screening feature that transmitted H+ and rejected Fe2+. Moreover, the membranes (TpTGCl/CPAN) exhibited outstanding acid-stability, which could maintain high separation performance after 10 cycle under strong-acid conditions. The result suggested that COF with chemical stability and functional embellishment offered opportunities to synthesis high performance ion exchange membrane, and it could further be leveraged to tackle other challenges in membrane separation field.
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