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Extraction: Advanced Methods

Extraction: Advanced Methods

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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HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin

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Cyclic Trinuclear Units Based Covalent Metal-Organic Frameworks for Gold Recovery.

Jie Luo¹, Jia-Tong Lin¹, Xiao Luo¹

¹College of Chemistry and Materials Science, Guangdong Provincial Key Laboratory of Supramolecular Coordination Chemistry, Jinan University, Guangzhou, 510632, China.

Angewandte Chemie (International Ed. in English)

|April 28, 2025

Summary

New covalent metal-organic frameworks (CMOFs) offer superior gold recovery. These materials exhibit high adsorption capacity, rapid kinetics, and reusability, enabling efficient gold extraction from electronic waste.

Keywords:

Covalent metal‐organic frameworks (CMOFs)Cyclic trinuclear units (CTUs)Gold catalysis Gold recovery Photocatalysis

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Area of Science:

Materials Science
Chemistry
Environmental Science

Background:

Developing efficient porous solids for gold recovery is crucial for economic and environmental reasons.
Designing high-performance solid adsorbents for gold remains a significant challenge.

Purpose of the Study:

To design novel covalent metal-organic frameworks (CMOFs) for enhanced gold recovery.
To investigate the adsorption mechanisms and catalytic applications of these new materials.

Main Methods:

Synthesis of three copper(I) cyclic trinuclear units (Cu(I)-CTUs) based CMOFs.
Characterization of CMOFs for gold adsorption capacity, kinetics, selectivity, and reusability.
Evaluation of CMOFs for gold extraction from electronic waste.
Exploration of sorption mechanisms (adsorption, chemical reduction, photocatalytic reduction).
Testing gold-loaded CMOFs as catalysts for alkyne hydration.

Main Results:

Achieved a high gold adsorption capacity of 3687 mg g^-1.
Demonstrated ultra-fast adsorption kinetics with >99% removal efficiency within 20 seconds.
Exhibited excellent selectivity and reusability of the CMOFs.
Successfully applied CMOFs for gold extraction from e-waste.
Identified three sorption mechanisms due to the redox properties of Cu-CTUs.
Utilized gold-loaded CMOFs as effective catalysts for alkyne hydration, yielding up to ~95% for six examples.

Conclusions:

The designed Cu(I)-CTUs based CMOFs represent a significant advancement in gold recovery materials.
These CMOFs offer a promising solution for economical and environmentally friendly gold extraction, particularly from e-waste.
The dual functionality of these materials as adsorbents and catalysts opens new avenues in materials science and chemical synthesis.