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Updated: Mar 2, 2026

Preparation, Purification, and Characterization of Lanthanide Complexes for Use as Contrast Agents for Magnetic Resonance Imaging
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Lanthanide separation using size-selective crystallization of Ln-MOFs.

Heng Ya Gao1, Wen Li Peng, Pan Pan Meng

  • 1State Key Laboratory for Nuclear Resources and Environment, and School of Biology, Chemistry and Material Science, East China University of Technology, Nanchang, Jiangxi 344000, China. ecitluofeng@163.com.

Chemical Communications (Cambridge, England)
|May 12, 2017
PubMed
Summary

This study introduces size-selective crystallization of lanthanide-metal-organic frameworks (Ln-MOFs) to effectively separate 13 lanthanide ions. This novel method demonstrates high selectivity for isolating valuable rare earth elements.

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Area of Science:

  • Materials Science
  • Inorganic Chemistry
  • Separation Science

Background:

  • Lanthanide (Ln) ions are critical in advanced technologies but challenging to separate due to similar chemical properties.
  • Current separation methods for lanthanides are often complex and inefficient, necessitating novel approaches.

Purpose of the Study:

  • To develop and present a size-selective crystallization method for the efficient separation of lanthanide ions.
  • To demonstrate the applicability of lanthanide-metal-organic frameworks (Ln-MOFs) in selective ion isolation.

Main Methods:

  • Utilized size-selective crystallization of four distinct types of Ln-MOFs.
  • Developed specific Ln-MOF compositions (Type I: La-Pr, Type II: Nd-Eu, Type III: Gd-Ho, Type IV: Er-Lu) for targeted separation.
  • Investigated the separation efficiency across a range of lanthanide ions.

Main Results:

  • Successfully separated 13 lanthanide ions (excluding Pm(iii)) using the developed Ln-MOF crystallization technique.
  • Demonstrated high selectivity in separating different groups of lanthanide ions based on their ionic radii.
  • Confirmed the effectiveness of the size-selective crystallization approach for lanthanide ion isolation.

Conclusions:

  • Size-selective crystallization of Ln-MOFs provides an effective and highly selective method for lanthanide ion separation.
  • This approach offers a promising route for the purification and recovery of valuable rare earth elements.
  • The study highlights the potential of MOFs in addressing challenges in rare earth element separation.