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New Ionic Liquid Based on the CMPO Pattern for the Sequential Extraction of U(VI), Am(III) and Eu(III)

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Abstract

Extraction of U(VI), Eu(III) and Am(III) has been performed from acidic aqueous solutions (HNO3, HClO4) into the ionic liquid [C4mim][Tf2N] in which a new extracting task-specific ionic liquid, based on the CMPO unit {namely 1-[3-[2-(octylphenylphosphoryl)acetamido]propyl]-3-methyl-1H-imidazol-3-ium bis(trifluoromethane)sulfonamide, hereafter noted OctPh-CMPO-IL}, was dissolved at low concentration (0.01 mol·L−1). EXAFS and UV–Vis spectroscopy measurements were performed to characterize the extracted species. The extraction of U(VI) is more efficient than the extraction of trivalent Am and Eu using this TSIL, for both acids and their concentration range. We obtained evidence that the metal ions are extracted as a solvate (UO2(OctPh-CMPO-IL)3) by a cation exchange mechanism. Nitrate or perchlorate ions do not play a direct role in the extraction by being part of the extracted complexes, but the replacement of nitric acid for perchloric acid entails a drop in the selectivity between U and Eu. However, our TSIL allows a sequential separation of U(VI) and Eu/Am(III) using the same HNO3 concentration and same nature of the organic phase, just by changing the ligand concentration.

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Acknowledgements

The financial support of the CNRS/NASU agreement (reference: EDC 25196, Project # 135651) for this work is greatly appreciated. The EXAFS experiments have been supported by the European FP7 TALISMAN project, under contract with the European Commission. We acknowledge the ROBL staff for their assistance during EXAFS measurements. The authors thank Maurice Coppe, Dr. Lionel Allouche and Dr. Bruno Vincent (Institute of Chemistry, University of Strasbourg, France) for the NMR measurements.

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Authors and Affiliations

  1. Université de Strasbourg, IPHC, 23 rue du Loess, 67037, Strasbourg, France

    Dariia Ternova, Ali Ouadi, Valérie Mazan, Sylvia Georg & Maria Boltoeva

  2. CNRS, UMR7178, 67037, Strasbourg, France

    Dariia Ternova, Ali Ouadi, Valérie Mazan, Sylvia Georg & Maria Boltoeva

  3. Institute of Organic Chemistry, NASU, Kiev, Ukraine

    Dariia Ternova, Vitaly Kalchenko & Stanislas Miroshnichenko

  4. CNRS, LEPMI, 1130 rue de la Piscine, 38402, Saint Martin d’Hères, France

    Isabelle Billard

  5. Université Grenoble Alpes, LEPMI, 38000, Grenoble, France

    Isabelle Billard

  6. IPNL, CNRS, Université de Lyon, UMR 5822, 69622, Villeurbanne, France

    Clotilde Gaillard

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  1. Dariia Ternova
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  2. Ali Ouadi
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  4. Sylvia Georg
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Ternova, D., Ouadi, A., Mazan, V. et al. New Ionic Liquid Based on the CMPO Pattern for the Sequential Extraction of U(VI), Am(III) and Eu(III). J Solution Chem 47, 1309–1325 (2018). https://doi.org/10.1007/s10953-018-0730-3

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