Covalent organic frameworks-incorporated thin film composite membranes prepared by interfacial polymerization for efficient CO2 separation

doi:10.1016/j.cjche.2022.02.014

Chinese Journal of Chemical Engineering ›› 2022, Vol. 43 ›› Issue (3): 152-160.DOI: 10.1016/j.cjche.2022.02.014

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Covalent organic frameworks-incorporated thin film composite membranes prepared by interfacial polymerization for efficient CO₂ separation

Haoqing Xu^1,2, Wenyan Feng^1,2, Menglong Sheng^1,2, Ye Yuan^1,2, Bo Wang³, Jixiao Wang^1,2, Zhi Wang^1,2

1. Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China;
2. Tianjin Key Laboratory of Membrane Science and Desalination Technology, State Key Laboratory of Chemical Engineering, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300350, China;
3. Life and Health Research Institute, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China

Received:2021-08-23 Revised:2022-02-21 Online:2022-04-28 Published:2022-03-28
Contact: Zhi Wang,E-mail:wangzhi@tju.edu.cn
Supported by:
This research is supported by the National Key Research & Development Program of China (2017YFB0603400), the National Natural Science Foundation of China (21938007).

Covalent organic frameworks-incorporated thin film composite membranes prepared by interfacial polymerization for efficient CO₂ separation

Haoqing Xu^1,2, Wenyan Feng^1,2, Menglong Sheng^1,2, Ye Yuan^1,2, Bo Wang³, Jixiao Wang^1,2, Zhi Wang^1,2

1. Chemical Engineering Research Center, School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China;
2. Tianjin Key Laboratory of Membrane Science and Desalination Technology, State Key Laboratory of Chemical Engineering, Collaborative Innovation Center of Chemical Science and Engineering, Tianjin University, Tianjin 300350, China;
3. Life and Health Research Institute, School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300384, China

通讯作者: Zhi Wang,E-mail:wangzhi@tju.edu.cn
基金资助:
This research is supported by the National Key Research & Development Program of China (2017YFB0603400), the National Natural Science Foundation of China (21938007).

Abstract

Abstract: Thin film composite (TFC) membranes with nanofillers additives for CO₂ separation show promising applications in energy and environment-related fields. However, the poor compatibility between nanofillers and polymers in TFC membranes is the main problem. In this work, covalent organic frameworks (COFs, TpPa-1) with rich —NH— groups were incorporated into polyamide (PA) segment via in situ interfacial polymerization to prepare defect-free TFC membranes for CO₂/N₂ separation. The formed covalent bonds between TpPa-1 and PA strengthen the interaction between nanofillers and polymers, thereby enhancing compatibility. Besides, the incorporated COFs disturb the rigid structure of the PA layer, and provide fast CO₂ transfer channels. The incorporated COFs also increase the content of effective carriers, which enhances the CO₂ facilitated transport. Consequently, in CO₂/N₂ mixed gas separation test, the optimal TFC (TpPa_0.025-PIP-TMC/mPSf) membrane exhibits high CO₂ permeance of 854 GPU and high CO₂/N₂ selectivity of 148 at 0.15 MPa, CO₂ permeance of 456 GPU (gas permeation unit) and CO₂/N₂ selectivity of 92 at 0.5 MPa. In addition, the TpPa_0.025-PIP-TMC/mPSf membrane also achieves high permselectivty in CO₂/CH₄ mixed gas separation test. Finally, the optimal TFC membrane showes good stability in the simulated flue gas test, revealing the application potential for CO₂ capture from flue gas.

Key words: Covalent organic frameworks, CO₂/N₂ separation, In situ interfacial polymerization, Compatibility, Covalent bonds

摘要： Thin film composite (TFC) membranes with nanofillers additives for CO₂ separation show promising applications in energy and environment-related fields. However, the poor compatibility between nanofillers and polymers in TFC membranes is the main problem. In this work, covalent organic frameworks (COFs, TpPa-1) with rich —NH— groups were incorporated into polyamide (PA) segment via in situ interfacial polymerization to prepare defect-free TFC membranes for CO₂/N₂ separation. The formed covalent bonds between TpPa-1 and PA strengthen the interaction between nanofillers and polymers, thereby enhancing compatibility. Besides, the incorporated COFs disturb the rigid structure of the PA layer, and provide fast CO₂ transfer channels. The incorporated COFs also increase the content of effective carriers, which enhances the CO₂ facilitated transport. Consequently, in CO₂/N₂ mixed gas separation test, the optimal TFC (TpPa_0.025-PIP-TMC/mPSf) membrane exhibits high CO₂ permeance of 854 GPU and high CO₂/N₂ selectivity of 148 at 0.15 MPa, CO₂ permeance of 456 GPU (gas permeation unit) and CO₂/N₂ selectivity of 92 at 0.5 MPa. In addition, the TpPa_0.025-PIP-TMC/mPSf membrane also achieves high permselectivty in CO₂/CH₄ mixed gas separation test. Finally, the optimal TFC membrane showes good stability in the simulated flue gas test, revealing the application potential for CO₂ capture from flue gas.

关键词: Covalent organic frameworks, CO₂/N₂ separation, In situ interfacial polymerization, Compatibility, Covalent bonds

Haoqing Xu, Wenyan Feng, Menglong Sheng, Ye Yuan, Bo Wang, Jixiao Wang, Zhi Wang. Covalent organic frameworks-incorporated thin film composite membranes prepared by interfacial polymerization for efficient CO₂ separation[J]. Chinese Journal of Chemical Engineering, 2022, 43(3): 152-160.

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Covalent organic frameworks-incorporated thin film composite membranes prepared by interfacial polymerization for efficient CO₂ separation

Covalent organic frameworks-incorporated thin film composite membranes prepared by interfacial polymerization for efficient CO₂ separation

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