点击次数：

论文类型：期刊论文

发表时间：2018-04-21

发表刊物：JOURNAL OF MATERIALS CHEMISTRY A

收录刊物：SCIE、EI

卷号：6

期号：15

页面范围：6370-6375

ISSN号：2050-7488

摘要：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.