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Photoluminescence: Applications01:14

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Highly efficient diglycolamide-based task-specific ionic liquids: synthesis, unusual extraction behaviour,

Prasanta K Mohapatra1, Arijit Sengupta, Mudassir Iqbal

  • 1Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400085, India. mpatra@barc.gov.in

Chemistry (Weinheim an Der Bergstrasse, Germany)
|January 16, 2013
PubMed
Summary

Two novel diglycolamide-based task-specific ionic liquids (DGA-TSILs) show high efficiency in extracting actinides and lanthanides. Dilution enhances extraction, mass transfer, and stripping, with excellent radiolytic stability for actinide separation.

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Area of Science:

  • Nuclear Chemistry
  • Separation Science
  • Materials Science

Background:

  • Advanced separation techniques are crucial for managing nuclear waste and recovering valuable elements.
  • Ionic liquids offer unique properties for solvent extraction, but their application in actinide and lanthanide separation requires tailored molecular designs.

Purpose of the Study:

  • To synthesize and evaluate novel diglycolamide-based task-specific ionic liquids (DGA-TSILs) for actinide and lanthanide extraction.
  • To investigate the impact of diluents on extraction efficiency, mass transfer, and stripping.
  • To elucidate the complexation behavior and stability of the DGA-TSILs.

Main Methods:

  • Solvent extraction experiments using acidic feed solutions containing actinides and lanthanides.
  • Slope analysis to determine the stoichiometry of extracted species.
  • Time-resolved laser fluorescence spectroscopy (TRLFS) to study complexation and water coordination.

Main Results:

  • DGA-TSILs demonstrated exceptionally high extraction of trivalent actinide ions (e.g., Am(3+)) and even higher extraction of lanthanide ions (e.g., Eu(3+)).
  • Dilution in C(4)mim(+)·NTf(2)(-) improved extraction ability, mass transfer, and stripping efficiency.
  • Slope analysis indicated extracted species involve one NO(3)(-) anion and two DGA-TSIL molecules.
  • TRLFS revealed strong complexation with no inner-sphere water in Eu(III)-DGA-TSIL complexes.
  • DGA-TSIL 6 exhibited high radiolytic stability.

Conclusions:

  • DGA-TSILs are highly effective extractants for trivalent actinides and lanthanides from acidic media.
  • Dilution in specific ionic liquids enhances the performance of DGA-TSILs for separation processes.
  • The DGA-TSIL system shows promise for efficient and stable actinide extraction under acidic conditions.