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Related Concept Videos

Ion Exchange01:17

Ion Exchange

1.1K
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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An Efficient Method for Selective Desalination of Radioactive Iodine Anions by Using Gold Nanoparticles-Embedded Membrane Filter
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Boosting Nanofiltration Membrane Selectivity via Amine-Polymer Additive Engineering for Efficient Lithium Extraction

Shaofan Duan1,2, Shuai Jiang1,2, Ping Xu1

  • 1Research Center for Membrane and Film Technology, Kobe University, 1-1 Rokkodaicho, Nada, Kobe, 657-8501, Japan.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|October 30, 2025
PubMed
Summary

This study introduces a novel method for enhancing lithium extraction from brine using modified nanofiltration (NF) membranes. The improved membranes demonstrate superior selectivity for lithium over magnesium, crucial for efficient direct lithium extraction (DLE).

Keywords:
amine‐polymer additive engineeringinterfacial polymerizationlithium extractionnanofiltration membrane

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Direct lithium extraction (DLE) using nanofiltration (NF) membranes is a sustainable alternative to evaporation.
  • Conventional polyamide (PA) NF membranes exhibit poor lithium/magnesium selectivity due to surface charge and permeance-selectivity trade-offs.

Purpose of the Study:

  • To develop a scalable method for enhancing lithium separation performance in NF membranes.
  • To improve Li+/Mg2+ selectivity for efficient lithium enrichment from brine.

Main Methods:

  • Incorporation of poly(allylamine) (PAA) into polyamide (PA) membranes during interfacial polymerization.
  • Characterization of membrane properties including water permeance and ion rejection.
  • Testing the optimized membrane in a two-stage NF process with simulated brine.

Main Results:

  • The optimized PA membrane, synthesized with PAA additive, showed a water permeance of 12.1 L m−2 h−1 bar−1.
  • Magnesium chloride (MgCl2) rejection significantly increased from 18.8% to 94.7%.
  • A two-stage NF process using the optimized membrane successfully purified lithium from simulated brine.

Conclusions:

  • The PAA-modified PA membrane offers enhanced Li+/Mg2+ selectivity and high water permeance.
  • This strategy presents a promising approach for efficient lithium enrichment and purification in DLE applications.
  • The developed membranes show potential for industrial application in sustainable lithium recovery from brines.