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Updated: Jul 10, 2026

An Efficient Method for Selective Desalination of Radioactive Iodine Anions by Using Gold Nanoparticles-Embedded Membrane Filter
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Selective Gold Recovery via Thermally Generated Water Microdroplets at Oil-Water Interfaces.

Ke Li1, Guanghui Yuan1, Yingchang Cao1

  • 1State Key Laboratory of Deep Oil and Gas, China University of Petroleum (East China), Qingdao 266580, P.R. China.

Journal of the American Chemical Society
|July 9, 2026
PubMed
Summary

This study introduces a novel method for recovering precious metals like gold using thermally generated water microdroplets at oil-water interfaces. This technique enables selective metal reduction and particle growth without external additives, offering an efficient and eco-friendly recovery process.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Environmental Science

Background:

  • Efficient and environmentally benign recovery of precious metals from aqueous systems is a significant challenge.
  • Existing methods often require external reductants, catalysts, or sorbents, increasing complexity and waste.

Purpose of the Study:

  • To demonstrate a novel method for selective precious metal recovery using interfacial microdroplet chemistry.
  • To explore the potential of thermally generated water microdroplets as reactive microenvironments for metal reduction and particle growth.

Main Methods:

  • Heating oil-water mixtures containing gold ions to generate interfacial water microdroplets.
  • Characterizing the redox-active species generated within the microdroplets.
  • Investigating the selective reduction and particle growth of gold, platinum, and silver.

Main Results:

  • Thermally generated water microdroplets create reactive interfacial environments enabling selective gold reduction without external agents.
  • The process generates solvated electrons and other redox-active species driving reduction reactions not observed in bulk water.
  • Dynamic microdroplet coalescence and rupture facilitate nanoparticle aggregation into easily separable larger particles.
  • The method demonstrated high-yield gold recovery with a recyclable oil phase, minimizing waste.

Conclusions:

  • Interfacial microdroplet chemistry provides a scalable and sustainable framework for selective precious metal recovery.
  • This approach offers an environmentally benign alternative to conventional methods, applicable to gold, platinum, and silver recovery.