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Related Concept Videos

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Related Experiment Video

Updated: Jan 10, 2026

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Ethanol/ethyl acetate azeotropic mixture gas-phase separation using MOF-801-modified monolithic columns.

Alaa Bin Shuqayr1, Sadeem Bin Tuwaym1, Mostafa Zeama2

  • 1Advanced Materials Research Chair, Chemistry Department, College of Science, King Saud University, Riyadh 11451, Saudi Arabia.

Journal of Chromatography. A
|November 22, 2025
PubMed
Summary

This study introduces a new composite monolithic column for gas chromatography (GC) by embedding zirconium-based MOF-801 particles into a divinylbenzene (DVB) polymer. The novel MOF-801@DVB columns offer rapid, high-efficiency separations of small molecules and azeotropes.

Keywords:
Azeotrope separationGas chromatographyHydrocarbon separationMOF-801Monolithic polymer columnsThermodynamic characterization

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Area of Science:

  • Analytical Chemistry
  • Materials Science
  • Separation Science

Background:

  • Organic monolithic columns are traditionally used for macromolecule separations.
  • Enhancing their performance for small molecule and azeotrope separations remains challenging.
  • Incorporating particles into monolithic matrices is a promising strategy for gas chromatography (GC).

Purpose of the Study:

  • To fabricate and evaluate a composite monolithic column with MOF-801 particles embedded in a DVB polymer framework.
  • To assess the performance of the MOF-801@DVB columns for rapid, high-efficiency separation of small molecules and azeotropes.
  • To investigate the thermodynamic properties and interaction mechanisms governing the separation process.

Main Methods:

  • Fabrication of a composite monolithic column with minimal loading (0.2 wt%) of zirconium-based MOF-801 particles within a divinylbenzene (DVB) polymer framework.
  • Evaluation of the MOF-801@DVB columns under low operating pressure (0.2 MPa) for light hydrocarbon and azeotrope separations.
  • Thermodynamic characterization using McReynolds constants and enthalpy-entropy compensation analysis.

Main Results:

  • Short (15 cm) MOF-801@DVB columns enabled rapid, high-efficiency separation of light hydrocarbons with excellent repeatability (>2000 runs).
  • Thermodynamic characterization showed enhanced dispersive surface energy and polar interaction character, with observed enthalpy-entropy compensation.
  • Successful separation of ethanol/ethyl acetate azeotropic mixtures with high selectivity (8.3 at 120 °C), surpassing benchmark materials.
  • Demonstrated inter-batch reproducibility (RSD% 1.41-6.29 %) across independently prepared columns.

Conclusions:

  • Integrating MOF particles into organic monolithic matrices expands their application in small molecule GC separations.
  • The MOF-801@DVB composite columns provide a cost-effective, high-stability platform for rapid gas-phase separations.
  • The separation performance is driven by thermodynamic control, enhanced by improved dispersion forces and hydrophilic framework effects.