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Research Article

Assembling ionic liquid into porous molecular filler of mixed matrix membrane to trigger high gas permeability, selectivity, and stability for CO2/CH4 separation

Liting Yu1, Liqin Hao2, Yang Feng3, Jia Pang1, Mengwei Guo4, Liangjun Li4, Weidong Fan1, Lili Fan1, Rongming Wang1( ), Zixi Kang1( ), Daofeng Sun1
School of Materials Science and Engineering, State Key Laboratory of Heavy Oil Processing, China University of Petroleum (East China), Qingdao 266580, China
College of Chemistry, Nankai University, Tianjin 300071, China
College of Chemistry and Chemical Engineering, China University of Petroleum (East China), Qingdao 266580, China
College of New Energy, China University of Petroleum (East China), Qingdao 266580, China
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Graphical Abstract

The ionic liquid was introduced into the molecular fillers of porous organic cage CC3, to construct the ionic liquid@CC3/PIM-1 membrane for the efficient separation of CO2 from CH4.

Abstract

As an emerging zero-dimensional nano crystalline porous material, porous organic cages (POCs) with soluble properties in organic solvents, are promising candidates as molecular fillers in mixed matrix membranes (MMMs). The pore structure of POCs should be adjusted to trigger efficient gas separation performance, and the interaction between filler and matrix should be optimized. In this work, ionic liquid (IL) was introduced into the molecular fillers of CC3, to construct the IL@CC3/PIM-1 membrane to effectively separate CO2 from CH4. The advantages of doping IL include: (1) narrowing the cavity size of POCs from 4.4 to 3.9 Å to enhance the diffusion selectivity, (2) strengthening the CO2 solubility to heighten the gas permeability, and (3) improving the compatibility between filler and matrix to upgrade membrane stability. After the optimization of the membrane composite, the IL@CC3/PIM-1-10% membrane possesses the CO2 permeability of 7868 Barrer and the CO2/CH4 selectivity of 73.4, which compared to the CC3/PIM-1-10% membrane, improved by 15.9% and 106.2%, respectively. Furthermore, the membrane has maintained a stable separation performance at varied temperatures and pressures during the long-term test. The proposed method offers an efficient way to improve the performance of POCs-based MMMs in gas separation.

Keywords

porous organic cagemixed matrix membraneionic liquidgas separation

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Nano Research
Volume 17 Issue 5,
May 2024
Pages 4535-4543
DOI: 10.1007/s12274-023-6329-z
Cite this article:
Yu L, Hao L, Feng Y, et al. Assembling ionic liquid into porous molecular filler of mixed matrix membrane to trigger high gas permeability, selectivity, and stability for CO2/CH4 separation. Nano Research, 2024, 17(5): 4535-4543. https://doi.org/10.1007/s12274-023-6329-z
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Received: 21 July 2023
Revised: 30 October 2023
Accepted: 12 November 2023
Published: 07 December 2023
© Tsinghua University Press 2023
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