Sequestration of Np(IV) and Pu(IV) with Hexa-n-octyl nitrilotriacetamide (HONTA) in an Ionic Liquid: Unusual Species vis-à-vis a Molecular Diluent

Rajesh B. Gujar, Bholanath Mahanty, Seraj A. Ansari, Richard J.M. Egberink, Jurriaan Huskens, Willem Verboom*, Prasanta K. Mohapatra*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

1 Citation (Scopus)

Abstract

The extraction of Np(IV) and Pu(IV) was studied using a tripodal amide ligand (N,N,N′,N′,N″,N″-hexa-n-octyl nitrilotriacetamide termed as HONTA) in an ionic liquid (C4mim·NTf2) as well as in a molecular diluent mixture (95% n-dodecane +5% iso-decanol) from an aqueous feed containing diluted nitric acid. The extraction efficiency of Pu(IV) was higher than that of Np(IV), while the RTIL-based solvent system extracted the metal ions better than the molecular diluent-based solvent system. The extracted species were ascertained by slope analysis as M(NO3)5·L(LH) and M(NO3)4·L2 for the ionic liquid- and the molecular diluent-based solvent systems, respectively. The stripping of the metal ions from the organic extracts was achieved efficiently when a buffered complexing medium of 0.05 M EDTA and 1 M guanidine carbonate was used. Cyclic voltammetry was done for the Np(IV) extract in the ionic liquid-based solvent system in view of the wide electrochemical window experienced.

Original languageEnglish
Pages (from-to)480-488
Number of pages9
JournalIndustrial and Engineering Chemistry Research
Volume63
Issue number1
Early online date19 Dec 2023
DOIs
Publication statusPublished - 10 Jan 2024

Keywords

  • 2024 OA procedure

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