期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 142, 期 15, 页码 6872-6877出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.0c00927
关键词
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资金
- Alexander von Humboldt Foundation
- Deutsche Forschungsgemeinschaft (DFG) [Ca 147/21]
In this study, we propose a new concept of vertically aligned 2D covalent organic framework (COF) layers forming a membrane for efficient gas separation on the basis of precise size exclusion. Gas transport takes place through the COF interlayer space (typically 0.3-0.4 nm) rather than through the nanometer-sized pore apertures. Construction of such a unique membrane architecture was implemented via in situ oriented growth of 2D COFs inside a skeleton of vertically aligned COAL-layered double hydroxide (LDH) nanosheets. The resultant vertical COF-LZU1 membrane exhibits a high H-2 permeance of similar to 3600 GPU together with a desirable separation selectivity for gas mixtures such as H-2/CO2 (31.6) and H-2/CH4 (29.5), thus surpassing the 2008 Robeson upper bounds. The universality of this approach was demonstrated by successfully producing two types of high-quality vertical COF membranes with superior performance as well as outstanding running stability.
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