Issue 13, 2023

A highly permeable porous organic cage composite membrane for gas separation

Abstract

Membrane-based separation processes have become the focus of research in the field of CO2/N2 and CH4/N2 separation due to their green, energy-saving, and high-efficiency characteristics. However, the insufficient gas permeance of separation membranes greatly restricts their applications in practical industrial separation. In this work, a highly permeable porous organic cage (POC) composite membrane was first proposed and constructed with the RCC3 porous organic cage crosslinked by terephthaloyl chloride (TPC). The RCC3 porous organic cage displayed a pore size of approximately 5.4 Å and a high specific surface area of 442.3 m2 g−1, which provided amine-rich subnanochannels for the rapid penetration of CO2. Moreover, the interfacial crosslinking reaction between RCC3 and TPC enabled the assembly of the TPC-RCC3 ultrathin film on the surface of the modified polysulfone (mPSf) substrate. On this basis, a trace amount of piperazine anhydrous (PIP) was further employed to regulate the cross-linking degree of the ultrathin film for improved CO2/N2 selectivity. The as-prepared composite membrane displayed a high CO2 permeance of 4303 GPU with a CO2/N2 selectivity of 30, and CH4 permeance of 1216 GPU with a CH4/N2 selectivity of 3.0 at 1 bar, and could maintain the permselectivity under a long-term operation. The excellent separation performance provided a more economical solution for CO2 capture from flue gas or natural gas purification.

Graphical abstract: A highly permeable porous organic cage composite membrane for gas separation

Supplementary files

Article information

Article type
Paper
Submitted
11 Dec. 2022
Accepted
14 Febr. 2023
First published
14 Febr. 2023

J. Mater. Chem. A, 2023,11, 6831-6841

A highly permeable porous organic cage composite membrane for gas separation

Z. Jiang, Y. Wang, M. Sheng, Z. Zha, J. Wang, Z. Wang and S. Zhao, J. Mater. Chem. A, 2023, 11, 6831 DOI: 10.1039/D2TA09632C

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