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Related Experiment Video

Updated: Sep 2, 2025

Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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Polyamide Covalent Organic Framework Membranes for Molecular Sieving.

Ya Lu1,2, Zhi-Bei Zhou2, Qiao-Yan Qi2

  • 1College of Chemistry and Material Science, Shanghai Normal University, 100 Guilin Road, Shanghai 200234, China.

ACS Applied Materials & Interfaces
|August 8, 2022
PubMed
Summary

Researchers developed new polyamide membranes using crystalline covalent organic frameworks (COFs). These advanced membranes offer high permeability and dye rejection, outperforming traditional amorphous materials for separation technology.

Keywords:
covalent organic frameworkmembranepolyamideseparationstability

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Separation Technology

Background:

  • Polyamide membranes are crucial for separation technologies but their amorphous nature leads to disordered pores and reduced performance.
  • Current amorphous polyamide membranes exhibit limitations in separation efficiency due to structural imperfections.

Purpose of the Study:

  • To introduce a novel polyamide membrane fabricated from amide-linked covalent organic frameworks (COFs).
  • To investigate the enhanced separation performance, permeability, and stability of these new membranes compared to existing materials.

Main Methods:

  • Fabrication of polyamide membranes using amide-linked covalent organic frameworks (COFs).
  • Characterization of membrane structure, including pore ordering and mechanical properties.
  • Evaluation of separation performance, focusing on water permeability and organic dye rejection rates.
  • Comparative analysis with membranes derived from COFs with imine and amine linkages.

Main Results:

  • The developed polyamide COF membranes exhibit high water permeability (482.3 L m⁻² h⁻¹ bar⁻¹).
  • Achieved high rejection rates for organic dyes, exceeding 99% for methylene blue.
  • Demonstrated excellent stability in harsh environments.
  • Outperformed membranes made from COFs with imine and amine linkages in mechanical properties, stability, and separation.

Conclusions:

  • Amide-linked COFs provide a crystalline, well-ordered structure beneficial for membrane fabrication.
  • Polyamide COF membranes represent a significant advancement in separation technology, offering superior performance.
  • This work highlights amide-linked COFs as promising advanced materials for high-performance separation membranes.