Abstract
The purification of low-grade coal-bed methane is extremely important,but challenging,due to the very similar physical properties of CH4 and N2.Herein,we proposed a dual polarization strategy by employing triazine and polyfluoride sites to construct polar pores in COF materials,achieving the efficient separa-tion of CH4 from N2.As expected,the dual polarized F-CTF-1 and F-CTF-2 exhibit higher CH4 adsorption capacity and CH4/N2 selectivity than CTF-1 and CTF-2,respectively.Especially,the CH4 uptake capacity and CH4/N2 selectivity of F-CTF-2 is 1.76 and 1.42 times than that of CTF-2.This work not only developed promising COF materials for CH4/N2 separation,but also provided important guidance for the separation of other adsorbates with similar properties.
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