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Highly Efficient Diglycolamide-Based Task-Specific Ionic Liquids: Synthesis, Unusual Extraction Behaviour, Irradiation, and Fluorescence Studies

Authors

  • Dr. Prasanta K. Mohapatra,

    Corresponding author
    1. Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400085 (India), Fax: (+91) 22-25505151
    • Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400085 (India), Fax: (+91) 22-25505151
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  • Arijit Sengupta,

    1. Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai-400085 (India), Fax: (+91) 22-25505151
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  • Mudassir Iqbal,

    1. Laboratory of Molecular Nanofabrication, MESA+Institute for Nanotechnology, University of Twente, PO Box 217, 7500 AE Enschede (The Netherlands)
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  • Dr. Jurriaan Huskens,

    1. Laboratory of Molecular Nanofabrication, MESA+Institute for Nanotechnology, University of Twente, PO Box 217, 7500 AE Enschede (The Netherlands)
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  • Dr. Willem Verboom

    1. Laboratory of Molecular Nanofabrication, MESA+Institute for Nanotechnology, University of Twente, PO Box 217, 7500 AE Enschede (The Netherlands)
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Abstract

Two new diglycolamide-based task-specific ionic liquids (DGA[BOND]TSILs) were evaluated for the extraction of actinides and lanthanides from acidic feed solutions. These DGA[BOND]TSILs were capable of exceptionally high extraction of trivalent actinide ions, such as Am3+, and even higher extraction of the lanthanide ion, Eu3+ (about 5–10 fold). Dilution of the DGA[BOND]TSILs in an ionic liquid, C4mim+NTf2, afforded reasonably high extraction ability, faster mass transfer, and more efficient stripping of the metal ion. The nature of the extracted species was studied by slope analysis, which showed that the extracted species contained one NO3 anion, along with the participation of two DGA[BOND]TSIL molecules. Time-resolved laser fluorescence spectroscopy (TRLFS) analysis showed a strong complexation with no inner-sphere water molecule in the EuIII[BOND]DGA[BOND]TSIL complexes in the presence and absence of C4mim+NTf2 as the diluent. The very high radiolytic stability of DGA[BOND]TSIL 6 makes it one of the most-efficient solvent systems for the extraction of actinides under acidic feed conditions.

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