期刊
JOURNAL OF MATERIALS CHEMISTRY A
卷 6, 期 15, 页码 6370-6375出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7ta08913a
关键词
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资金
- China Scholarship Council (CSC)
- UGENT BOF
- Ghent University
- FWO [PEGASUS]2 Marie Sklodowska-Curie [665501]
- Ghent University Special Research Fund [BOF.PDO.2016.0030.01]
- Research Foundation Flanders (FWO-Vlaanderen) [G.0048.13N]
- China Ministry of Science and Technology [2016YFE01069800]
- National Natural Science Foundation of China [21403025]
In this article, a set of fluorine functionalized covalent triazine-based frameworks have been designed and synthesized with 2,2 ',3,3 ',5,5 ',6,6 '-octafluoro-4,4 '-biphenyldicarbonitrile as the monomer under typical ionothermal conditions. A prominent defluorination process during synthesis etches the networks to release CFn, resulting in a significant loss of fluorine and carbon. Notably, the synergistic effects of polar C-F bonds and rich CO2-philic N sites bestow upon the framework an excellent H-2 uptake (1.77 wt%, 77 K and 1 bar) as well as a significantly high CO2 adsorption capacity (5.98 mmol g(-1), at 273 K and 1 bar), surpassing all related CTF materials measured under identical conditions that have been reported in the literature to date. Additionally, the material also exhibits a high CO2/N-2 selectivity of 31 as predicted by the Henry model. The hydrophobicity of the CTF materials has been significantly enhanced owing to the incorporation of hydrophobic fluorine groups, which was further confirmed by ambient water vapor sorption.
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