Ultrathin PEI-functionalized carboxyl covalent organic framework membranes for efficient CO2/N2 separation

Shichen Zeng, Xu Liang, Mingang Zhao, Yanxiong Ren, Hanze Ma, Ziting Zhu, Yuhan Wang, Shaoyu Wang, Junyi Zhao, Guangzhaoyao Yang, Xuerui Wang, Fusheng Pan, Guangwei He, Zhongyi Jiang

科研成果: 期刊稿件文章同行评审

18 引用 (Scopus)

摘要

Covalent organic frameworks (COF) are deemed as disruptive membrane materials owing to their versatile functionalities, high stability and ordered nanochannels. However, the size mismatch between the COF intrinsic pore and gas molecules becomes a grand challenge when using COF membrane for carbon capture. Herein, we propose a new type of polymer-functionalized COF laminar membranes through grafting CO2-phlic polyethyleneimine (PEI) polymer onto carboxylic acid COF (cCOF) laminar membranes. The cCOF nanosheets with high density of carboxyl groups are prepared via modified single phase solution method and then assembled to fabricate membranes. Further, the cCOF membranes are functionalized with PEI using 1-ethyl-3-(3-dimethylaminopropyl) carbodiimide/N-Hydroxysuccinimide (EDC/NHS) coupling chemistry. The introduction of abundant amino groups from PEI afford the affinity of membranes toward CO2. Meanwhile, the graft of the PEI polymers reduces the defects or pinholes on the membrane surface. As a result, the PEI functionalized cCOF membranes exhibit a high CO2 permeance of 1004 GPU and a CO2/N2 selectivity of 33.7, which reach the carbon capture target performance and show great prospect for treating real flue gas. Our approach of functionalizing cCOF membranes with tailored functionalities may inspire the design of molecule-selective COF membranes.

源语言英语
文章编号122590
期刊Journal of Membrane Science
698
DOI
出版状态已出版 - 4月 2024

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