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Related Experiment Video

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Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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Single-Phase Covalent Organic Framework Staggered Stacking Nanosheet Membrane for CO2 -Selective Separation.

Pengyuan Wang1, Yuan Peng1,2,3, Chenyu Zhu1,3

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

Angewandte Chemie (International Ed. in English)
|July 21, 2021
PubMed
Summary

This study developed ultrathin covalent organic framework (COF) membranes for precise gas separations. The COF membranes show excellent carbon dioxide (CO2) separation performance, reaching commercial feasibility for syngas applications.

Keywords:
CO2-selective separationcovalent organic frameworksnanosheetsstaggered stackingtwo-dimensional membranes

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Nanotechnology

Background:

  • Two-dimensional covalent organic frameworks (2D COFs) offer potential for gas separation membranes due to their porosity, stability, and tunable properties.
  • A key challenge is fabricating COF membranes with pore sizes small enough for precise gas separations.

Purpose of the Study:

  • To develop single-phase COF membranes with precisely controlled pore sizes for enhanced gas separation.
  • To investigate the CO2-philic separation performance of these novel COF membranes.

Main Methods:

  • Synthesized three types of β-ketoenamine-type COF nanosheets with varying pore sizes.
  • Fabricated ultrathin nanosheet membranes using a staggered stacking approach.
  • Evaluated gas separation performance, focusing on CO2/H2 selectivity and permeance.

Main Results:

  • The developed COF membranes exhibited narrowed pore sizes and selective adsorption capacities.
  • TpPa-2 COF membrane achieved a CO2/H2 separation factor of 22 and CO2 permeance of 328 GPU at 298 K.
  • The membrane performance indicates suitability for industrial syngas separations.

Conclusions:

  • The novel COF membranes demonstrate effective CO2 separation capabilities.
  • The staggered stacking and tailored pore sizes are crucial for high separation performance.
  • These findings pave the way for practical COF-based gas separation technologies.