Tailoring CO2/CH4 Separation Efficiency with [THTDP][Cl]/Pebax-1657 Supported Ionic Liquid Membranes: Design, Characterization, and Theoretical Insights

Tushar Patil, Sarthak Patel, Manish Kumar Sinha, Swapnil Dharaskar, Jalaja Pandya, Satyam Shinde, Mika Sillanpaa, Chang Yoo, Mohammad Khalid

Research output: Contribution to journalArticlepeer-review


The use of renewable resources to generate energy is growing, but regrettably, the large amount of CO2 emissions it releases harms the environment. The main greenhouse gas, CO2, is a major factor in global climate change, which eventually disrupts the delicate balance of ecosystems within the globe. Therefore, the development of effective and sustainable technology for CO2 capture and storage is both urgent and compelling. Among many different approaches for CO2 capture, membrane separation has shown to be one of the most promising, yielding excellent results in terms of effectiveness as well as affordability. Nonetheless, to enhance membrane performance more significantly in CO2 separation, researchers have focused on ionic liquids, a family of organic salts recognized for their high thermal stability, low volatility, and tuneable characteristics. Because of this, ionic liquids have attracted a lot of attention from the academic and industrial sectors as possible additions to enhance membranes’ capacity for CO2 separation. This study explores the potential of Tetrahexyl tetradecyl phosphonium chloride incorporated into Pebax-1657 to enhance CO2/CH4 separation performance. Ion gel membranes were synthesized with varying ionic liquid concentrations (5, 10, 20 wt%) and characterized for structural and morphological evaluations. Gas separation performance was assessed through permeation experiments, showing increased CO2/CH4 selectivity from 19.23 to 21.81 with higher IL concentrations, especially under high pressure. CO2 permeability increased from 70.01 to 273.61 barrer with the addition of 20% [THTDP][Cl]. Density functional theory calculations provided theoretical insights into the interaction energies between ionic liquid and gas molecules, corroborating experimental findings. The study demonstrates the novelty of integrating phosphonium-based ionic liquid with Pebax-1657, significantly enhancing CO2/CH4 selectivity due to strong CO2 interactions. This research offers a promising approach to developing advanced membranes for efficient and selective CO2 capture, contributing to sustainable gas separation technologies. Graphical Abstract: (Figure presented.)

Original languageEnglish
JournalTopics in Catalysis
Publication statusAccepted/In press - 2024


  • CO Capture
  • CO/CH separation
  • DFT
  • Ionic liquids
  • Membranes

ASJC Scopus subject areas

  • Catalysis
  • General Chemistry


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