Mixed Matrix Membranes (MMMs) Comprising Exfoliated 2D Covalent Organic Frameworks (COFs) for Efficient CO2 Separation

Zixi Kang; Yongwu Peng; Yuhong Qian; Daqiang Yuan; Matthew A. Addicoat; Thomas Heine; Zhigang Hu; Lincoln Tee; Zhengang Guo; Dan Zhao

doi:10.1021/acs.chemmater.5b02902

Mixed Matrix Membranes (MMMs) Comprising Exfoliated 2D Covalent Organic Frameworks (COFs) for Efficient CO₂ Separation

Zixi Kang, Yongwu Peng, Yuhong Qian, Daqiang Yuan, Matthew A. Addicoat, Thomas Heine, Zhigang Hu, Lincoln Tee, Zhengang Guo, Dan Zhao

Department of Chemistry

Research output: Contribution to journal › Article › peer-review

404 Citations (Scopus)

Abstract

Two water-stable covalent organic frameworks (COFs) named NUS-2 and NUS-3 having two-dimensional (2D) layered structures with different pore sizes were synthesized. These COFs were exfoliated into nanosheets and even monolayers with high aspect ratio. They were subsequently blended with commercial polymers poly(ether imide) (Ultem) or polybenzimidazole (PBI) into mixed matrix membranes (MMMs) exhibiting highly homogeneous textures due to the excellent compatibility between COF fillers and polymer matrixes. Thanks to the selective gas sorption properties of the porous COF fillers, the prepared MMMs exhibited increased gas permeabilities with NUS-2@PBI demonstrating an excellent H₂/CO₂ permselectivity that exceeded the 2008 Robeson upper bound. Our approach of using exfoliated 2D COFs as porous fillers in MMMs paves a novel way toward the tailored synthesis of advanced composite membrane materials for clean energy and environmental sustainability.

Original language	English
Pages (from-to)	1277-1285
Number of pages	9
Journal	Chemistry of Materials
Volume	28
Issue number	5
DOIs	https://doi.org/10.1021/acs.chemmater.5b02902
Publication status	Published - 2016 Mar 8

Bibliographical note

Funding Information:
This work is supported by National University of Singapore (CENGas R-261-508-001-646) and Singapore Ministry of Education (MOE AcRF Tier 1 R-279-000-410-112, AcRF Tier 2 R-279-000-429-112).

Publisher Copyright:
© 2016 American Chemical Society.

All Science Journal Classification (ASJC) codes

Chemistry(all)
Chemical Engineering(all)
Materials Chemistry

Access to Document

10.1021/acs.chemmater.5b02902

Cite this

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title = "Mixed Matrix Membranes (MMMs) Comprising Exfoliated 2D Covalent Organic Frameworks (COFs) for Efficient CO2 Separation",

abstract = "Two water-stable covalent organic frameworks (COFs) named NUS-2 and NUS-3 having two-dimensional (2D) layered structures with different pore sizes were synthesized. These COFs were exfoliated into nanosheets and even monolayers with high aspect ratio. They were subsequently blended with commercial polymers poly(ether imide) (Ultem) or polybenzimidazole (PBI) into mixed matrix membranes (MMMs) exhibiting highly homogeneous textures due to the excellent compatibility between COF fillers and polymer matrixes. Thanks to the selective gas sorption properties of the porous COF fillers, the prepared MMMs exhibited increased gas permeabilities with NUS-2@PBI demonstrating an excellent H2/CO2 permselectivity that exceeded the 2008 Robeson upper bound. Our approach of using exfoliated 2D COFs as porous fillers in MMMs paves a novel way toward the tailored synthesis of advanced composite membrane materials for clean energy and environmental sustainability.",

author = "Zixi Kang and Yongwu Peng and Yuhong Qian and Daqiang Yuan and Addicoat, {Matthew A.} and Thomas Heine and Zhigang Hu and Lincoln Tee and Zhengang Guo and Dan Zhao",

note = "Funding Information: This work is supported by National University of Singapore (CENGas R-261-508-001-646) and Singapore Ministry of Education (MOE AcRF Tier 1 R-279-000-410-112, AcRF Tier 2 R-279-000-429-112). Publisher Copyright: {\textcopyright} 2016 American Chemical Society.",

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AU - Kang, Zixi

AU - Peng, Yongwu

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AU - Yuan, Daqiang

AU - Addicoat, Matthew A.

AU - Heine, Thomas

AU - Hu, Zhigang

AU - Tee, Lincoln

AU - Guo, Zhengang

AU - Zhao, Dan

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PY - 2016/3/8

Y1 - 2016/3/8

N2 - Two water-stable covalent organic frameworks (COFs) named NUS-2 and NUS-3 having two-dimensional (2D) layered structures with different pore sizes were synthesized. These COFs were exfoliated into nanosheets and even monolayers with high aspect ratio. They were subsequently blended with commercial polymers poly(ether imide) (Ultem) or polybenzimidazole (PBI) into mixed matrix membranes (MMMs) exhibiting highly homogeneous textures due to the excellent compatibility between COF fillers and polymer matrixes. Thanks to the selective gas sorption properties of the porous COF fillers, the prepared MMMs exhibited increased gas permeabilities with NUS-2@PBI demonstrating an excellent H2/CO2 permselectivity that exceeded the 2008 Robeson upper bound. Our approach of using exfoliated 2D COFs as porous fillers in MMMs paves a novel way toward the tailored synthesis of advanced composite membrane materials for clean energy and environmental sustainability.

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