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Optimizing Graphene Oxide Interlayer Spacing for Zeolitic Imidazolate Framework-8 Growth Toward Enhanced Shale Oil

Hang Wang1, Longyu Wang1, Zhibang Liu1

  • 1Shandong Key Laboratory of Intelligent Energy Materials, School of Materials Science and Engineering, China University of Petroleum (East China), Qingdao, 266580, P. R. China.

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This study introduces novel zeolitic imidazolate framework-graphene oxide (ZIF-8-GO) membranes for energy-efficient shale oil separation. These membranes demonstrate superior performance over traditional methods, offering high selectivity and flux for petroleum fractionation.

Keywords:
ZIF‐8membraneoptimizing interlayer spacingpetroleum fractionationshale oil

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Petroleum hydrocarbon separation relies on energy-intensive fractional distillation.
  • Existing membrane technologies face challenges like swelling and reduced flux in organic solvents.
  • Graphene oxide (GO) membranes show promise but require structural stabilization.

Purpose of the Study:

  • To develop a novel ZIF-8-GO membrane for energy-efficient shale oil separation.
  • To overcome limitations of traditional membranes, such as swelling and low flux.
  • To provide a practical framework for precise separation of shale oil components.

Main Methods:

  • Utilizing quaternary ammonium salts to control GO interlayer spacing.
  • Facilitating in situ growth of zeolitic imidazolate framework (ZIF-8) within GO layers.
  • Cross-linking GO layers with ZIF-8 nanoparticles to prevent solvent-induced swelling.

Main Results:

  • The ZIF-8-GO membrane achieved nearly complete rejection of n-docosane in n-hexane.
  • Achieved a solvent permeance of 16.4 L m⁻² h⁻¹ bar⁻¹, 71 times higher than commercial membranes.
  • Demonstrated effective concentration of hydrocarbons with <20 carbon atoms and maintained efficiency with complex shale oil mixtures.

Conclusions:

  • The ZIF-8-GO membrane offers a highly permeable and selective alternative for petroleum fractionation.
  • This MOF-GO membrane technology presents a new avenue for efficient shale oil separation.
  • The developed membrane provides a practical and robust solution for separating complex hydrocarbon mixtures.