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Ultramicroporous Covalent Organic Framework Nanosheets with Functionality Pair for Membrane C2H2/C2H4 Separation |
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| Authors: | Dr. Jialu Li Zeliang Cheng Ziyang Wang Junchao Dong Haicheng Jiang Wenjian Wang Prof. Dr. Xiaoqin Zou Prof. Dr. Guangshan Zhu |
| Affiliation: | 1. Faculty of Chemistry, Northeast Normal University, Changchun, 130024 P. R. China These authors contributed equally to this work.;2. Faculty of Chemistry, Northeast Normal University, Changchun, 130024 P. R. China |
| Abstract: | Gas 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. |
| Keywords: | C2H2 Separation COF Functionalization Covalent Organic Frameworks Mixed-Matrix Membranes Nanosheets |