Ionic liquid-mediated CO2/N2 separation in MoSe2 nanochannels: a molecular dynamics perspective.
Xun Liu1, Shuang Wang1, Pan He1
1Hubei Collaborative Innovation Center for Advanced Organic Chemical Materials, Ministry of Education Key Laboratory for the Synthesis and Application of Organic Functional Molecules, School of Chemistry and Chemical Engineering, Hubei University, Wuhan 430062, China. zdh@hubu.edu.cn.
Physical Chemistry Chemical Physics : PCCP
|March 11, 2026
Summary
Supported ionic liquid membranes (SILMs) using 2D nanomaterials like molybdenum diselenide show promise for CO2/N2 separation. Optimized conditions enhance efficiency by leveraging confined ionic liquids for selective gas interaction.
Area of Science:
- Materials Science
- Chemical Engineering
- Nanotechnology
Background:
- Supported ionic liquid membranes (SILMs) are gaining attention for gas separation.
- Two-dimensional (2D) nanomaterials offer unique properties for enhancing membrane performance.
- Ionic liquids (ILs) play a crucial role in the separation capabilities of SILMs.
Purpose of the Study:
- To investigate the CO2/N2 separation performance of a composite membrane using molybdenum diselenide (MoSe2) interlayers and [BMIM][BF4] ionic liquid.
- To optimize the separation efficiency by tuning parameters like interlayer spacing, IL loading, and temperature.
- To elucidate the separation mechanisms at the microstructural level.
Main Methods:
- Molecular dynamics (MD) simulations were employed to construct and analyze the composite membrane system.
- Systematic evaluation of separation efficiency under varying conditions.
- Analysis of density distributions and cation orientation to understand membrane channel behavior.
Main Results:
- Optimal CO2/N2 separation was achieved at 300 K with 65% IL loading and 4 nm interlayer spacing.
- Confined ILs within MoSe2 nanochannels exhibited distinct structures and stronger gas interactions compared to bulk ILs.
- Differences in gas solubility within the IL phase were identified as the primary driver for efficient separation.
Conclusions:
- The developed 2D nanomaterial-based SILM (2D-SILM) demonstrates significant potential for CO2/N2 separation.
- The study provides theoretical insights into the structure-property relationships governing gas separation in confined IL systems.
- Findings offer guidance for designing advanced SILMs for carbon capture and other gas separation applications.
