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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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Related Experiment Video

Updated: Mar 9, 2026

Removal of Trace Elements by Cupric Oxide Nanoparticles from Uranium In Situ Recovery Bleed Water and Its Effect on Cell Viability
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Protein Hydrogel Microbeads for Selective Uranium Mining from Seawater.

Songzi Kou1, Zhongguang Yang1, Fei Sun1

  • 1Department of Chemical and Biomolecular Engineering, The Hong Kong University of Science and Technology , Clear Water Bay, Kowloon, Hong Kong.

ACS Applied Materials & Interfaces
|January 7, 2017
PubMed
Summary

This study introduces a novel protein hydrogel system for efficient oceanic uranium extraction. The engineered super uranyl binding proteins (SUPs) demonstrate high selectivity and efficiency in enriching uranium from seawater.

Keywords:
green miningheavy metalmicrofluidicsprotein materialsoft matter

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Area of Science:

  • Materials Science
  • Biotechnology
  • Environmental Science

Background:

  • Oceanic uranium represents a vast, untapped energy resource.
  • Current methods for extracting uranium from seawater are lacking practical application.
  • Developing efficient and selective uranium extraction is crucial for alternative energy solutions.

Purpose of the Study:

  • To develop a practical method for oceanic uranium extraction.
  • To engineer a protein-based hydrogel system for efficient uranyl ion (UO2^2+) capture.
  • To demonstrate the feasibility of using this system for large-scale uranium recovery.

Main Methods:

  • Fabrication of a protein hydrogel network using engineered super uranyl binding proteins (SUPs).
  • Assembly of the hydrogel network via thiol-maleimide click chemistry under mild conditions.
  • Production of monodisperse SUP hydrogel microbeads using a microfluidic device.

Main Results:

  • Achieved efficient uranyl (UO2^2+) enrichment from natural seawater.
  • Demonstrated high selectivity for uranium capture.
  • Obtained an enrichment index (K) of 2.5 × 10^3, indicating significant uranium capture efficiency.

Conclusions:

  • Protein hydrogels offer a feasible platform for oceanic uranium extraction.
  • Engineered SUPs integrated into hydrogel microbeads show promise for sustainable energy.
  • This approach paves the way for practical applications in harnessing oceanic uranium resources.