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Related Concept Videos

Extraction: Advanced Methods00:56

Extraction: Advanced Methods

407
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...
407

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Updated: Jun 1, 2025

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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Lanmodulin-Decorated Microbes for Efficient Lanthanide Recovery.

Melanie Gut1, Tatum Wilhelm1, Olivia Beniston1

  • 1Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.

Advanced Materials (Deerfield Beach, Fla.)
|January 17, 2025
PubMed
Summary
This summary is machine-generated.

Bio-scaffolded proteins offer a sustainable method for rare earth element (REE) recovery, crucial for clean energy technologies. This novel approach enables efficient REE capture and recycling from complex matrices.

Keywords:
bio‐scaffoldinglanmodulinlanthanide recyclingmetal miningsurface expression

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Area of Science:

  • Biotechnology
  • Materials Science
  • Environmental Science

Background:

  • Rare earth elements (REEs) are critical for clean energy technologies but are sourced via carbon-intensive mining.
  • Developing sustainable and efficient methods for REE recovery is essential.

Purpose of the Study:

  • To develop a bio-scaffolded protein material for effective and selective recovery of rare earth elements.
  • To create an environmentally friendly and cost-effective solution for REE recycling.

Main Methods:

  • Surface expression of lanmodulin (LanM) protein on E. coli, followed by freeze-drying to create a bio-material.
  • Integration of the bio-material into a filter for REE capture from complex matrices.
  • Development of a rapid colorimetric assay for monitoring REE recovery.

Main Results:

  • Over 80% recovery of four REE cations (Y3+, La3+, Gd3+, Tb3+) even with high concentrations of competing ions.
  • High capture capacity of 12 mg g-1 dry cell weight and stability over ten bind-and-release cycles.
  • Successful integration of a rapid (<5 min) colorimetric assay for real-time monitoring.

Conclusions:

  • Bio-scaffolded proteins provide a robust, low-cost material for selective REE recovery and recycling.
  • This technology offers a promising environmentally friendly alternative to traditional mining methods.
  • The developed filter material and assay enhance the deployability and efficiency of REE recovery processes.