期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 6, 期 35, 页码 16849-16853出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8ta05641b
关键词
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资金
- Sino-German (CSC-DAAD) Postdoc Scholarship Program, 2017 [57343410]
- program of China Scholarships Council (CSC) [201709920078]
- Deutsche Forschungsgemeinschaft (DFG) [Ca 147/21]
Covalent organic frameworks (COFs) are promising for constructing gas-separation membranes due to their versatile architectures, customizable functionalities and chemical stabilities. However, synthesis of continuous COF membranes still remains a challenge and rather underexplored. Herein, we present a two-dimensional (2D) azine-linked ACOF-1 membrane synthesized on a porous support by a solvothermal approach. The ACOF-1 membrane with a thickness of 8 m shows a high selectivity of 86.3 in CO2/CH4 mixed gas separation with a favorable CO2 permeance of about 9.9 x 10(-9) mol m(-2) s(-1) Pa-1, and the overall performance exceeds the Robeson upper bound (2008). This surprising molecular sieving effect is attributed to an effective narrowing of the pore diameter (0.94 nm) owing to crystal intergrowth. A long-term test of gas permeation demonstrates the outstanding stability of the ACOF-1 membrane. These properties recommend the ACOF-1 membrane for CO2 capture and other gas separations.
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