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Related Concept Videos

Capillary Electrophoresis: Applications01:30

Capillary Electrophoresis: Applications

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Capillary electrophoretic separations offer various modes, each with unique applications. These modes include capillary zone electrophoresis, capillary gel electrophoresis, capillary array electrophoresis, capillary isoelectric focusing, capillary isotachophoresis, micellar electrokinetic chromatography, and capillary electrochromatography.
Capillary zone electrophoresis (CZE) separates ionic components based on their electrophoretic mobility. It has been used to separate proteins, amino acids,...
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Supercritical fluid chromatography (SFC) provides a beneficial substitute for gas chromatography (GC) and liquid chromatography (LC) for certain samples because it merges the top attributes of both techniques. SFC allows the separation and analysis of compounds that GC or LC does not easily manage. These compounds are traditionally nonvolatile or thermally unstable, making GC unsuitable and lacking functional groups required for HPLC analysis.
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Experimental and predictive analysis of deep eutectic solvent gel membranes for efficient CO2 separation.

Remya Ranjith1, Bharti Saini1, Swapnil Dharaskar2

  • 1Department of Chemical Engineering, School of Energy Technology, Pandit Deendayal Energy University, Gandhinagar, Gujarat, 382426, India.

Scientific Reports
|August 13, 2025
PubMed
Summary

Deep Eutectic Solvents (DES) offer a cost-effective and less toxic alternative for Carbon Dioxide (CO2) capture. DES gel membranes demonstrate efficient CO2 separation from CO2/CH4 mixtures, showing promise for industrial applications.

Keywords:
CO2 separationDES-gel membranesDeep eutectic solventsDensity functional theoryMembrane separationPermeability

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Global warming necessitates efficient Carbon Dioxide (CO2) capture technologies.
  • Membrane-based CO2 separation is recognized for its energy efficiency.
  • Ionic liquids, while effective, face limitations due to cost and toxicity.

Purpose of the Study:

  • To fabricate and evaluate Deep Eutectic Solvents (DES) gel membranes for CO2 separation from CO2/CH4 mixtures.
  • To explore DES as a sustainable alternative to ionic liquids in gas separation.
  • To investigate the physicochemical properties and gas transport behavior of DES-based membranes.

Main Methods:

  • DES gel membranes were fabricated using choline chloride, glycerol, Pebax1657 polymer, and polyvinylidene fluoride supports.
  • Fourier transform infrared spectroscopy (FTIR) confirmed DES synthesis.
  • X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) analyzed membrane structure.
  • Gas permeation tests (CO2, CH4) were conducted at varying temperatures and pressures.
  • Density Functional Theory (DFT) modeled DES-gas molecule interactions.

Main Results:

  • The synthesized DES-gel membranes effectively separated CO2 from CO2/CH4 mixtures.
  • Highest CO2 permeability values reached 138.98 Barrer (pure gas) and 93.17 Barrer (mixed gas).
  • Physicochemical properties of DES were characterized across a temperature range (293.15–343.15 K).

Conclusions:

  • DES gel membranes present a viable, cost-effective, and environmentally friendlier alternative to ionic liquid membranes for CO2 capture.
  • The study validates the potential of DES in developing advanced membrane technologies for gas separation.