Missing-linker Defects in Covalent Organic Framework Membranes for Efficient CO2 Separation

Zheyuan Guo; Hong Wu; Yu Chen; Shiyi Zhu; Haifei Jiang; Shuqing Song; Yanxiong Ren; Yuhan Wang; Xu Liang; Guangwei He; Yonghong Li; Zhongyi Jiang

doi:10.1002/anie.202210466

Missing-linker Defects in Covalent Organic Framework Membranes for Efficient CO₂ Separation

Angew Chem Int Ed Engl. 2022 Oct 10;61(41):e202210466. doi: 10.1002/anie.202210466. Epub 2022 Sep 1.

Authors

Zheyuan Guo^{1

2}, Hong Wu^{1

2

3}, Yu Chen^{2

4}, Shiyi Zhu^{1

2}, Haifei Jiang^{1

2}, Shuqing Song^{1

2}, Yanxiong Ren^{1

2

5}, Yuhan Wang^{1

2}, Xu Liang^{1

2}, Guangwei He^{1

2}, Yonghong Li^{1

2}, Zhongyi Jiang^{1

2

5

6}

Affiliations

¹ Key Laboratory for Green Chemical Technology of Ministry of Education, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China.
² Collaborative Innovation Center of Chemical Science and Engineering (Tianjin), Tianjin, 300072, China.
³ Tianjin Key Laboratory of Membrane Science and Desalination Technology, Tianjin University, Tianjin, 300072, China.
⁴ School of Environmental Science and Engineering, School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300072, China.
⁵ Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Binhai New City, Fuzhou, 350207, China.
⁶ Chemistry and Chemical Engineering Guangdong Laboratory, School of Chemical Engineering and Technology, Tianjin University, Shantou, 515031, China.

PMID: 35980347
DOI: 10.1002/anie.202210466

Abstract

Covalent organic framework (COF) membranes with tunable ordered channels and free organic groups hold great promise in molecular separations owing to the synergy of physical and chemical microenvironments. Herein, we develop a defect engineering strategy to fabricate COF membranes for efficient CO₂ separation. Abundant amino groups are in situ generated on the COF nanosheets arising from the missing-linker defects during the reactive assembly of amine monomer and mixed aldehyde monomers. The COF nanosheets are assembled to fabricate COF membranes. Amino groups, as the CO₂ facilitated transport carriers, along with ordered channels endow COF membrane with high CO₂ permeances exceeding 300 GPU and excellent separation selectivity of 80 for CO₂ /N₂ , and 54 for CO₂ /CH₄ mixed gas under humidified state. Our defect engineering strategy offers a facile approach to generating free organic functional groups in COF membranes and other organic framework membranes for diverse chemical separations.

Keywords: Amino Functionalization; CO2 Separation; Covalent Organic Frameworks; Defect Engineering Strategy; Facilitated Transport Membrane.

Abstract

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