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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

431
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...
431

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Light-Promoted Extraction of Precious Metals Using a Porphyrin-Integrated One-Dimensional Covalent Organic Framework.

Yuan-Zhe Cheng1,2,3, Xiaotian Bao4, Di Jiang2,3

  • 1School of Chemical Sciences, University of Chinese Academy of Sciences, Beijing, 100049, China.

Angewandte Chemie (International Ed. in English)
|October 7, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a light-sensitive covalent organic framework (PP-COF) for efficient precious metal recycling. Light irradiation significantly enhances the adsorption of gold, platinum, and silver ions from waste, aiding circular economy efforts.

Keywords:
chemical adsorptioncovalent organic frameworklight irradiationprecious metal extractionrecycling resources

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Area of Science:

  • Materials Science
  • Environmental Chemistry
  • Chemical Engineering

Background:

  • Precious metals are vital for industry but face supply chain risks due to scarcity.
  • Recycling precious metals from waste streams is a sustainable and economically viable strategy.
  • Current recycling methods can be energy-intensive and may not fully recover valuable metals.

Purpose of the Study:

  • To develop an environmentally friendly and energy-saving method for precious metal ion reduction and adsorption.
  • To synthesize and evaluate a novel light-sensitive covalent organic framework (PP-COF) for enhanced precious metal recovery.
  • To demonstrate the feasibility of using light irradiation to improve adsorption capacity and kinetics for gold, platinum, and silver ions.

Main Methods:

  • Synthesis of a novel light-sensitive covalent organic framework (PP-COF).
  • Adsorption experiments of gold, platinum, and silver ions onto PP-COF under light irradiation and dark conditions.
  • Evaluation of adsorption capacity, kinetics, and recovery efficiency using simulated e-waste leachates.
  • Characterization of the form of recovered precious metals.

Main Results:

  • PP-COF exhibited significantly enhanced adsorption capacities for Au, Pt, and Ag ions under light irradiation compared to dark conditions (3.3, 1.9, and 1.2 times higher, respectively).
  • Equilibrium adsorption capacities reached 4729 mg/g for gold, 573 mg/g for platinum, and 519 mg/g for silver.
  • A filtration column using PP-COF recovered over 99.8% of gold ions from simulated e-waste leachates with light irradiation.
  • One gram of PP-COF can process up to 0.15 tonnes of e-waste leachates, and recovered metals formed easily separable micron-sized particles.

Conclusions:

  • Light-sensitive covalent organic frameworks offer a promising strategy for efficient and sustainable precious metal recovery.
  • Light irradiation acts as an effective auxiliary method to boost adsorption performance and kinetics in precious metal recycling.
  • This approach contributes to resource circularity and reduces reliance on primary precious metal sources.