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Related Concept Videos

Ion Exchange01:17

Ion Exchange

670
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...
670
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

552
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...
552

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Related Experiment Video

Updated: Sep 19, 2025

Preparation of Highly Porous Coordination Polymer Coatings on Macroporous Polymer Monoliths for Enhanced Enrichment of Phosphopeptides
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Amorphous phase-engineered Cr-based coordination polymers for efficient gold recovery in highly acidic environments.

Xin Yuan1, Baihui Wang1, Wanru Wang1

  • 1Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang, 414006, Hunan, China.

Environmental Research
|May 31, 2025
PubMed
Summary

Researchers developed a novel amorphous coordination polymer for efficient gold recovery from electronic waste. This material shows high capacity, stability, and a unique triple-action adsorption mechanism for practical applications.

Keywords:
Amorphous coordination polymersGold recoveryMultimode adsorption mechanismSelective adsorption

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Nanotechnology

Background:

  • Electronic waste poses environmental challenges due to valuable metal content.
  • Efficient and selective recovery of gold from e-waste is crucial for sustainability.
  • Current recovery methods often lack efficiency, selectivity, or stability.

Purpose of the Study:

  • To develop a novel material for high-efficiency and selective gold recovery from electronic waste.
  • To engineer amorphous coordination polymers with enhanced adsorption properties.
  • To elucidate the adsorption mechanism for optimized gold recovery.

Main Methods:

  • Synthesis of amorphous chromium-glyoxal bis-(2-hydroxyanil) coordination polymers (Cr-GBHA aCPs).
  • Characterization of material properties, including amorphous architecture and active sites.
  • Gold adsorption experiments under various conditions (temperature, pH).
  • Investigation of adsorption-desorption cycles and mechanism elucidation.

Main Results:

  • Achieved a high gold adsorption capacity of up to 4242 mg/g at 55 °C.
  • Demonstrated exceptional acid tolerance (pH 2.62) and 100% recovery efficiency over 8 cycles.
  • Revealed a synergistic multimode adsorption mechanism involving electrostatic interaction, chelation, and reduction.

Conclusions:

  • The novel Cr-GBHA aCPs offers a promising solution for efficient and selective gold recovery from e-waste.
  • Amorphous phase engineering of coordination polymers enables superior material performance.
  • The triple-action adsorption mechanism sets a new standard for precious metal recovery materials.