期刊
JOURNAL OF MEMBRANE SCIENCE
卷 601, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.memsci.2020.117864
关键词
Azobenzene-assisted exfoliation; Covalent organic frameworks; Azo; Large-scale nanosheets; Water flux
资金
- National Science Foundation of China [51661145024, 21774123]
- Development of Scientific and Technological Project of the Jilin Province [20160519017JH]
- Chinese Academy of Sciences -Wego Group High-tech Research Development
The porous 2D covalent organic nanosheets (CONs) membrane has become a new generation of membrane material due to its ultrahigh permeation flux. The main challenge in fabricating CONs membrane is how to exfoliate covalent organic frameworks (COFs) into large-scale, few-layer nanosheets. Herein, we presented a simple and economical azobenzene template approach for exfoliating 2D COFs into large nanosheets and achieved fabrication of ultrathin CONs membrane successfully. Three COFs with different skeleton structures were chosen to explore the influencing factors for effective exfoliating. We found that the compatibility between azobenzene molecules and COFs skeleton structure was the key point for exfoliation. When the COF skeleton matching with the azobenzene molecular structure, COFs can be easily exfoliated into larger-scale CONs than nanosheets prepared by conventional exfoliation methods. The as-exfoliated nanosheets membrane showed a higher water flux (596 L m(2) h(-1) bar(-1)) than a graphene oxide (GO) membrane (4.3 L m(2) h(-1) bar(-1)) and high rejection of dye molecules, due to the nano-channels perpendicular to the surface of the membrane.
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