Affiliation:
1. Faculty of Chemistry Northeast Normal University Changchun 130024 P. R. China
Abstract
AbstractGas separation efficiency of covalent organic framework (COF) membrane can be greatly elevated through precise functionalization. A pair‐functionalized COF membrane of 1,3,5‐triformylphloroglucinol (TP) and isoquinoline‐5,8‐diamine (IQD) monomers in two and three nodes is designed and synthesized. TP‐IQD is crystallized in a two‐dimensional structure with a pore size of 6.5 Å and a surface area of 289 m2 g−1. This COF possesses N−O paired groups which cooperatively interact with C2H2 instead of C2H4. TP‐IQD nanosheets of ≈10 μm in width and ≈4 nm in thickness are prepared by mechanical exfoliation; they are further processed with 6FDA‐ODA polymer into a hybrid membrane. High porosity and functionality pair of TP‐IQD offer the membrane with significantly increased C2H2 permeability and C2H2/C2H4 selectivity which are 160 % and 430 % higher of pure 6FDA‐ODA. The boosted performance demonstrates high efficiency of the pair‐functionality strategy for the synthesis of separation‐led COFs.
Funder
National Natural Science Foundation of China
Subject
General Chemistry,Catalysis
Cited by
10 articles.
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