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Two-Dimensional Metal-Organic Framework Nanosheets for Membrane-Based Gas Separation.

Yuan Peng1,2, Yanshuo Li1, Yujie Ban1

  • 1State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, CAS, 457 Zhongshan Road, Dalian, 116023, China.

Angewandte Chemie (International Ed. in English)
|June 23, 2017
PubMed
Summary

Researchers developed ultrathin membranes using metal-organic framework (MOF) nanosheets for efficient gas separation. These novel MOF nanosheet membranes show excellent H2/CO2 selectivity and high H2 permeance, promising advanced molecular sieve applications.

Keywords:
gas separationmetal-organic frameworksmolecular sieve membranesnanosheetsultrapermeable membranes

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Metal-organic frameworks (MOFs) offer structural diversity for molecular sieve membranes.
  • Fabricating high-performance MOF nanosheet membranes presents significant challenges.
  • Minimizing mass-transfer barriers is crucial for efficient membrane performance.

Purpose of the Study:

  • To discover appropriate MOF nanosheets for membrane applications.
  • To develop a facile method for high-performance MOF nanosheet membrane fabrication.
  • To evaluate the gas separation performance of ultrathin MOF nanosheet membranes.

Main Methods:

  • Modified soft-physical exfoliation to disintegrate lamellar MOFs into high-aspect-ratio nanosheets.
  • Preparation of sub-10 nm-thick ultrathin membranes from MOF nanosheets.
  • Testing H2/CO2 separation performance, including separation factor and H2 permeance.

Main Results:

  • Successfully prepared ultrathin MOF nanosheet membranes with thicknesses under 10 nm.
  • Achieved remarkable H2/CO2 separation performance with a separation factor up to 166.
  • Demonstrated high H2 permeance of up to 8×10^-7 mol·m^-2·s^-1·Pa^-1 at elevated temperatures.
  • Observed a well-defined size-exclusion effect contributing to separation efficiency.

Conclusions:

  • The developed MOF nanosheet membranes exhibit excellent gas separation capabilities.
  • The facile exfoliation and membrane fabrication method overcomes previous challenges.
  • These membranes show great promise as next-generation ultrapermeable gas separation solutions.