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Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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Staggered-Stacking Two-Dimensional Covalent Organic Framework Membranes for Molecular and Ionic Sieving.

Jingfeng Wang1, Xiaoming Zhang1, Ruichen Shen2

  • 1College of Chemistry and Molecular Sciences, Key Laboratory of Biomedical Polymers of Ministry of Education, Institute of Molecular Medicine, Renmin Hospital of Wuhan University, School of Microelectronics, Wuhan University, Wuhan 430072, China.

ACS Nano
|December 10, 2024
PubMed
Summary

High-performance membranes from stacked 2D covalent organic frameworks (COFs) achieve precise sieving of water and salt ions. This novel design enhances mechanical strength and ion rejection for advanced separation applications.

Keywords:
covalent organic frameworksionic sievingmembranesstacked structurewater transport

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemical Engineering

Background:

  • Two-dimensional covalent organic frameworks (2D COFs) offer porous nanochannels for molecular transport, showing promise in separation, energy storage, and catalysis.
  • Current 2D COF membranes face limitations due to large pore sizes (>1 nm) and weak interlayer interactions, hindering efficient sieving of water molecules (0.3 nm) and hydrated ions (>0.7 nm).

Purpose of the Study:

  • To develop high-performance 2D COF membranes with narrowed channels and improved mechanical properties for selective water and ion sieving.
  • To investigate the effect of staggered stacking of cationic and anionic 2D COF nanosheets on membrane performance.

Main Methods:

  • Fabrication of 2D COF membranes through the staggered stacking of cationic and anionic 2D COF nanosheets.
  • Characterization of membrane pore size, mechanical performance, water permeability, and salt ion rejection.

Main Results:

  • The stacked 2D COF membranes exhibit narrowed channels (0.7 × 0.4 nm²) and doubled mechanical performance compared to single-phase membranes.
  • Monovalent salt ion rejection was significantly improved to 77.9% in stacked membranes, up from ~49.2% in single-phase membranes, with maintained water permeability.
  • Enhanced interlayer interactions between nanosheets contributed to improved mechanical strength and separation efficiency.

Conclusions:

  • The staggered stacking strategy effectively narrows channels and enhances mechanical properties of 2D COF membranes.
  • These high-performance membranes offer a promising approach for precise molecular and ionic sieving in separation technologies.
  • The design provides a potential pathway for advanced nanoporous membrane construction.