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<p>Efficient lithium extraction from lithium resources is of great significance for the continued development of various lithium-powered electronic technologies. We herein report polynorbornene resins incorporating triethylene glycol (<b>triEG</b>) as an economically viable lithium-chelating ligand. The resins were prepared by ring-opening metathesis polymerization (ROMP) of <b>triEG</b>-functionalized norbornene monomer and bis-norbornene as a crosslinker. The synthesized resins captured up to 46% of lithium from a 50&#xa0;ppm lithium solution in acetonitrile, a mock solution relevant to lithium-ion battery recycling processes. The binding capacity reached up to 22.3&#xa0;mg/g. Thermodynamic and kinetic analyses indicated that the adsorption followed both Langmuir and Freundlich models and exhibited pseudo-second-order kinetics, indicating favorable lithium binding via chemisorption. The resins could be reused multiple times without loss of chelating performance. Selectivity studies using magnesium and sodium, which are prevalent metal ions in harsh brine, showed that the resin exhibited 1.86 and 2.98-fold higher selectivity for lithium over magnesium and sodium, respectively. The facile synthesis and structural simplicity of the polymeric resin provide a foundation for further development of lithium-chelating resins through modification of ligand architectures.</p> Graphical abstract

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Lithium-chelating polynorbornene resins: adsorption studies with triethylene glycols

  • 期刊论文

  • 发表日期：

    2026年6月15日

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  • Yongseok Hur,
  • Byung Doo Chin,
  • Byungjin Koo

摘要

Efficient lithium extraction from lithium resources is of great significance for the continued development of various lithium-powered electronic technologies. We herein report polynorbornene resins incorporating triethylene glycol (triEG) as an economically viable lithium-chelating ligand. The resins were prepared by ring-opening metathesis polymerization (ROMP) of triEG-functionalized norbornene monomer and bis-norbornene as a crosslinker. The synthesized resins captured up to 46% of lithium from a 50 ppm lithium solution in acetonitrile, a mock solution relevant to lithium-ion battery recycling processes. The binding capacity reached up to 22.3 mg/g. Thermodynamic and kinetic analyses indicated that the adsorption followed both Langmuir and Freundlich models and exhibited pseudo-second-order kinetics, indicating favorable lithium binding via chemisorption. The resins could be reused multiple times without loss of chelating performance. Selectivity studies using magnesium and sodium, which are prevalent metal ions in harsh brine, showed that the resin exhibited 1.86 and 2.98-fold higher selectivity for lithium over magnesium and sodium, respectively. The facile synthesis and structural simplicity of the polymeric resin provide a foundation for further development of lithium-chelating resins through modification of ligand architectures.

Graphical abstract