亚胺
膜
共价键
共价有机骨架
单体
材料科学
化学工程
渗透
图层(电子)
纳米技术
多孔性
基质(水族馆)
选择性
多孔介质
化学
聚合物
有机化学
复合材料
工程类
催化作用
地质学
海洋学
生物化学
作者
Xiansong Shi,Rui Wang,Ankang Xiao,Tian-Zhi Jia,Shi‐Peng Sun,Yong Wang
出处
期刊:ACS applied nano materials
[American Chemical Society]
日期:2018-10-12
卷期号:1 (11): 6320-6326
被引量:63
标识
DOI:10.1021/acsanm.8b01537
摘要
Covalent organic frameworks (COFs) are expected to provide exceptional permselectivity in molecular separations because of their stable, uniform, molecular-sized pore channels. To realize the superior performances of COF-based membranes, it remains strongly desired for the rapid and controllable growth of COFs on substrates under mild conditions. Herein, we report on the layer-by-layer (LbL) strategy for the rapid synthesis of imine-linked COFs on porous polymeric substrates in ethanol at room temperature. This strategy exploits the alternative availability of each COF monomer to endow a self-limiting nature to the reaction, thus resulting in conformal growth of COFs along the pore wall of the substrate. The grown COFs with thicknesses tunable by LbL cycles reduce the effective pore sizes, while the inherent ∼2 nm channels in COFs allow additional water to permeate. Thus-produced membranes exhibit significantly enhanced selectivity (>99% rejection to dyes) and unprecedentedly high water permeances, which are ∼3–20 times higher than other membranes with similar rejections. This work potentially presents a new and general methodology to prepare imine-based COF membranes for molecular separations.
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