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Synthesis and CO<sub>2</sub>/N<sub>2</sub> Separation Performance Analysis of Mixed Matrix Membrane (MMM) Based on Different Bimetallic Metal-Organic Frameworks (Ni-Cu-MOF-74, Ni-Co-MOF-74, and Ni-Zn-MOF-74).

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Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes
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Dual-Layer PDMS/Polysulfone Composite Membranes Incorporating Cu-MOF-74 for Enhanced CO2 Capture Performance.

Shoaib Ahsan1, Muhammad Ahsan1, Tayyaba Noor1

  • 1School of Chemical and Materials Engineering (SCME), National University of Sciences and Technology (NUST), Sector H-12, Islamabad 44000, Pakistan.

Polymers
|June 12, 2026
PubMed
Summary
This summary is machine-generated.

This study enhances CO2 separation using dual-layer membranes with MOF-74, improving gas transport and selectivity. The composite membranes offer a promising approach for efficient carbon capture technologies.

Keywords:
CO2 capturecomposite membranesgas separationmetal–organic frameworksmixed-matrix membranes

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Polymeric membranes face a permeability-selectivity trade-off in CO2 separation.
  • Metal-organic frameworks (MOFs) and composite membranes offer solutions to enhance performance.
  • MOF-74 (Cu and Ni variants) exhibit strong CO2 affinity.

Purpose of the Study:

  • To evaluate the impact of incorporating MOF-74 into PDMS/PSF composite membranes for CO2/N2 separation.
  • To assess the synergistic effects of PSF support, PDMS selective layer, and MOF-74.
  • To investigate the CO2 transport properties and selectivity of the developed membranes.

Main Methods:

  • Fabrication of dual-layer PDMS/PSF composite membranes using phase inversion and solution casting.
  • Incorporation of MOF-74 (Cu and Ni variants) into the PDMS selective layer.
  • Gas permeation testing using single-gas CO2 and N2 at 2-5 bar feed pressures.

Main Results:

  • Incorporation of MOF-74 improved CO2 transport properties.
  • The 1 wt.% Cu-MOF-74 composite membrane achieved 912.5 GPU CO2 permeance and 94.75 CO2/N2 selectivity.
  • Dual-layer configuration enhanced permeance and mechanical strength compared to unsupported membranes.

Conclusions:

  • Dual-layer PDMS/PSF composite membranes with MOF-74 show potential for improved CO2 separation.
  • The synergistic design effectively enhances gas separation efficiency.
  • Further research on mixed-gas testing and long-term stability is needed for practical application.