Extraction of actinides by Tri-n-butyl phosphate derivatives: Effect of substituents

[Display omitted] •6 analogues of TBP were evaluated for their solvent extraction behaviour of Actinides.•Distribution coefficient values are depending on nature and size of the substituents.•Presence of electron donating groups enhances the uptake of the actinides. Tri-n-butyl phosphate (TBP) is mo...

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Bibliographic Details
Published in:Inorganica Chimica Acta 2018-01, Vol.469, p.123-132
Main Authors: Annam, Suresh, Gopakumar, Gopinadhanpillai, Brahmmananda Rao, C.V.S., Sivaraman, N., Sivaramakrishna, Akella, Vijayakrishna, Kari
Format: Article
Language:English
Subjects:
Actinides
Basicity
Chemical synthesis
Density functional theory
Derivatives
Enthalpy
Nitric acid
Nuclear fuel cycle
Nuclear fuels
Phosphonates
Physical properties
Solvent extraction
Thermodynamics
Tri-n-butyl phosphate
Uranium
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Summary:[Display omitted] •6 analogues of TBP were evaluated for their solvent extraction behaviour of Actinides.•Distribution coefficient values are depending on nature and size of the substituents.•Presence of electron donating groups enhances the uptake of the actinides. Tri-n-butyl phosphate (TBP) is most extensively used extractant in the nuclear fuel cycle. The present work investigates the effect of substituents and their role in the basicity of organophosphorus extractant on the uptake of actinides. In this connection, we have synthesized six different analogues of TBP by altering one of its butoxy group. The synthesized TBP derivatives were well characterized and evaluated for their solvent extraction behavior towards U(VI), Th(IV), Pu(IV) and Am(III), as well as acid uptake as a function of nitric acid ranging from 0.01 to 6M and the data provides the comparison of their extraction behavior with that of 30% (1.1M) tri-n-butyl phosphate under identical conditions. It was observed that distribution coefficient values strongly depend on the nature and size of the substituents. The presence of electron donating groups enhances the uptake of the actinides and the distribution coefficient values were significantly larger as compared to that of TBP. In addition, the effect of sodium nitrate on the extraction of uranium and enthalpy of extraction were also studied and revealed that the extraction process was exothermic.
ISSN:0020-1693
1873-3255
DOI:10.1016/j.ica.2017.07.048