A cation-gating mechanism for enhanced CO2/N2 separation by porous nanostructure supported ionic liquid membrane.

IF 3.1 2区 化学 Q3 CHEMISTRY, PHYSICAL Journal of Chemical Physics Pub Date : 2025-03-07 DOI:10.1063/5.0256071
Guochao Sun, Yunan Wang, Bing Fang, Yong-Qiang Li, Yanmei Yang, Mingwen Zhao, Yuanyuan Qu, Weifeng Li
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Abstract

2D porous material supported ionic liquid membranes (SILMs) have demonstrated great potential for CO2 separation and purification, outperforming the original porous material. However, the working mechanism behind their enhanced CO2 selectivity remains unclear. In this study, we have conducted molecular dynamics simulation to investigate the CO2/N2 separation performance and the underlying mechanism of SILMs taking 2D rhombic N-graphdiyne (r-N-GDY) with intrinsic high thermal stability and porous structure covered with 1-butyl-3-methylimidazolium tetrafluoroborate as the representative SILM model. We found that the increase in the SILM thickness can decrease the permeance of CO2 and N2 but can effectively increase the CO2/N2 selectivity. The optimal SILM thickness is found to be 0.6 nm with the permeance reaching 5.7 × 105 GPU for CO2 and the selectivity being up to 25.8, which is 15 times higher than the 1.7 of bare r-N-GDY. This is because CO2 encounters a much lower transmembrane energy barrier than N2. At the molecular level, it is fascinating to observe a cation-gating mechanism, where IL cations play a determinative role in CO2 selectivity. More specifically, the IL cations normally bind at the pore site, like a closed gate for gas. When a CO2 molecule approaches the pore, the IL cation moves away; thus, the gate is opened for CO2 translocation. In contrast, N2 molecules are incapable of opening the cation gate. Such a cation-gating process guarantees the high selectivity of SILMs. This study offers insight into enhanced CO2 selectivity and provides theoretical guidance for designing nanocomposite membranes for gas or water treatment.

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多孔纳米结构支撑离子液体膜增强 CO2/N2 分离的阳离子门控机制。
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来源期刊
Journal of Chemical Physics
Journal of Chemical Physics 物理-物理:原子、分子和化学物理
CiteScore
7.40
自引率
15.90%
发文量
1615
审稿时长
2 months
期刊介绍: The Journal of Chemical Physics publishes quantitative and rigorous science of long-lasting value in methods and applications of chemical physics. The Journal also publishes brief Communications of significant new findings, Perspectives on the latest advances in the field, and Special Topic issues. The Journal focuses on innovative research in experimental and theoretical areas of chemical physics, including spectroscopy, dynamics, kinetics, statistical mechanics, and quantum mechanics. In addition, topical areas such as polymers, soft matter, materials, surfaces/interfaces, and systems of biological relevance are of increasing importance. Topical coverage includes: Theoretical Methods and Algorithms Advanced Experimental Techniques Atoms, Molecules, and Clusters Liquids, Glasses, and Crystals Surfaces, Interfaces, and Materials Polymers and Soft Matter Biological Molecules and Networks.
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