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Extraction of \( {\text{Np}}^{4+} \) and \( {\text{NpO}}_{2}^{2+} \) from Nitric Acid Medium Using TODGA in Room Temperature Ionic Liquids

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Abstract

Extraction of Np4+ and \( {\text{NpO}}_{2}^{2 + } \) was carried out from nitric acid feeds using solutions of N,N,N′,N′-tetra-n-octyldiglycolamide (TODGA) in two imidazolium-based room temperature ionic liquids, viz., 1-butyl-3-methylimidazolium bis(trifluoromethanesulphonyl) imide ([C4mim][NTf2]) and 1-octyl-3-methylimidazolium bis(trifluoromethanesulphonyl) imide ([C8mim][NTf2]). The extraction equilibrium was attained within 2 h for both the metal ions in both the ionic liquids. While a cation exchange mechanism is proposed for the extraction of \( {\text{NpO}}_{2}^{2 + } , \) an ion-pair mechanism of extraction is proposed for the Np4+ ion. The nature of the extracted species was determined by carrying out experiments at varying concentrations of TODGA, and species of the type Np(L)2(NO3)4 and NpO2(L)2+ were found to be extracted in 3 mol·dm−3 HNO3. The identification of these extracted species was also supported from the variable nitrate and C4mim+ ion concentration experiments.

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Acknowledgements

The authors thank Dr. P.K. Pujari, Head, Radiochemistry Division, Bhabha Atomic Research Centre for his keen interest in this work.

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  1. Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, 400085, India

    S. A. Ansari, P. K. Mohapatra & D. R. Raut

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  1. S. A. Ansari
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Correspondence to P. K. Mohapatra.

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Ansari, S.A., Mohapatra, P.K. & Raut, D.R. Extraction of \( {\text{Np}}^{4+} \) and \( {\text{NpO}}_{2}^{2+} \) from Nitric Acid Medium Using TODGA in Room Temperature Ionic Liquids. J Solution Chem 47, 1326–1338 (2018). https://doi.org/10.1007/s10953-018-0741-0

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