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Randomly oriented covalent organic framework membrane for selective Li+ sieving from other ions.

Shiwen Bao1,2, Zhaoyu Ma2, Lei Yu1,2

  • 1State Key Laboratory of Bio-Fibers and Eco-textiles, College of Materials Science and Engineering, Shandong Collaborative Innovation Center of Marine Biobased Fibers and Ecological Textiles, Qingdao University, Qingdao, P. R. China.

Nature Communications
|April 24, 2025
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Summary

This study introduces a novel covalent organic framework (COF) membrane for selective lithium-ion (Li+) separation. The membrane efficiently distinguishes Li+ from competing ions like Na+, K+, Mg2+, and Ca2+, advancing sustainable lithium extraction technologies.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Biological ion channels demonstrate high selectivity for ion transport.
  • Artificial membranes are needed for efficient lithium extraction and sustainable technologies.
  • Current methods struggle with precise differentiation of lithium from competing ions.

Purpose of the Study:

  • To develop a covalent organic framework (COF) membrane for selective separation of lithium ions (Li+) from competing cations.
  • To investigate the mechanisms behind the membrane's selectivity and ion transport.
  • To assess the membrane's performance under electrical potential for enhanced ion flux.

Main Methods:

  • Fabrication of a randomly oriented covalent organic framework (COF) membrane.
  • Incorporation of sulfonic acid groups within the COF structure.
  • Evaluation of ion selectivity for Li+, Na+, K+, Mg2+, and Ca2+.
  • Measurement of ion flux under applied electrical potential.

Main Results:

  • The COF membrane exhibits narrow pores, enabling size-based selectivity among alkaline ions.
  • Sulfonic groups facilitate preferential binding and transport of Na+ and K+ while retaining Li+.
  • The membrane achieves selectivity beyond detection limits for K+ and Na+ over Li+.
  • Electrical potential enhances ion flux through the membrane by over an order of magnitude.
  • The membrane effectively rejects Li+ while allowing transport of Mg2+ and Ca2+.

Conclusions:

  • The developed COF membrane demonstrates high selectivity for Li+ separation from major competing ions.
  • Synergistic effects of pore size and functional groups drive the selective ion transport.
  • The membrane shows potential for advancing biomimetic materials for resource extraction from aqueous sources.