A Hydrophobic Deep Eutectic Solvent for Nuclear Fuel Cycle: Extraction of Actinides and Dissolution of Uranium Oxide
J.S. Gamare, Bal Govind Vats
Abstract
Abstract Hydrophobic Deep Eutectic Solvents (DESs) have been attracting attention for metal ion extraction in solvent extraction process due to their favorable properties. A Trioctyl phosphine oxide (TOPO) and Thenoyl trifluoroacetone (HTTA) based hydrophobic DES was synthesized and characterized by FTIR and NMR spectroscopy. Actinide ions ( UO 2 2+ , Pu 4+ and Am 3+ ) and Eu 3+ ion extraction was carried out using the DES which shows that it extracts these metal ions from aqueous nitric acid medium depending upon the molarity of nitric acid. At higher molarity of nitric acid (>5 M) the extraction becomes insignificant only for trivalent metal ions and open up the possibility to selectively strip trivalent metal ions from tetravalent and hexavalent ions. This DES was also used for dissolution of uranium oxide (UO 3 ). The dissolution kinetics was studied and it was shown that oxide was dissolved within an hour at 80 °C. The maximum solubility of UO 3 in DES was measured and found to be 130±5 mg/mL which is one of the highest reported solubility of UO 3 in ILs and DES. The species of uranium which is formed in situ in DES was ascertained to be UO 2 (TTA) 2 .TOPO after dissolution of UO 3 as supported by FTIR and NMR ( 1 H and 31 P) investigations.