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Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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Enhanced Propylene/Propane Separation via Aniline-Decorated ZIF-8 Membrane: Lattice Rigidity Adjustment and

Xin Zhang1,2, Guangtong Hai1, Yujian Yao1

  • 1Beijing Key Laboratory for Membrane Materials and Engineering, Department of Chemical Engineering, Tsinghua University, 100084, Beijing, China.

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|September 11, 2024
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Summary

Aniline modification of ZIF-8 membranes enhances gas separation. This tuning of crystallographic microstructure improves molecular sieving, leading to high propylene/propane selectivity.

Keywords:
Membrane separationadsorption siteslattice rigiditymetal–organic frameworks (MOFs)molecule sieving

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Metal-organic framework (MOF)-based membranes are crucial for molecular separation.
  • MOF crystallographic microstructure and adsorption capacity directly impact gas separation performance.

Purpose of the Study:

  • To investigate the effect of aniline modification on ZIF-8 membranes for improved gas separation.
  • To understand the structure-property relationship between aniline incorporation and ZIF-8 performance.

Main Methods:

  • Aniline was added during ZIF-8 synthesis.
  • X-ray diffraction (XRD) with Rietveld refinement was used to analyze crystallographic phase changes.
  • Density functional theory (DFT) calculations assessed interaction energies.
  • A current-driven method prepared the aniline-decorated ZIF-8 (Aniₓ-ZIF-8) membrane.

Main Results:

  • Aniline encapsulation induced a crystallographic phase shift in ZIF-8 (I_43m to Cm).
  • Aniline-modified ZIF-8 exhibited selective adsorption between propylene and propane.
  • The Aniₓ-ZIF-8 membrane achieved a propylene/propane separation selectivity of up to 85.
  • DFT confirmed aniline's role in promoting the Cm phase and enhancing selectivity.

Conclusions:

  • Aniline modification effectively tunes ZIF-8's crystallographic microstructure.
  • This tuning enhances the molecular sieving capabilities of ZIF-8 membranes.
  • Aniline-decorated ZIF-8 membranes show significant potential for efficient propylene/propane separation.