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

• 作者: Haoqing Xu Wenyan Feng Menglong Sheng Ye Yuan Bo Wang Jixiao Wang Zhi Wang
• 来源期刊: 中国化学工程学报（英文版）
• 年，卷（期）: 2022,（3）
• 页码范围: 152-160
• 页数: 9页
• 语种: 英文

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 nanofil-lers 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 inter-facial 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(TpPa0.025-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 TpPa0.025-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.