Comparative study on aqueous acid free UO2 dissolution-extraction using DHOA adduct into room temperature ionic liquid/supercritical carbon dioxide/n-hexane
Abstract
Feasibility was established for direct dissolution-extraction of uranium employing adduct of N,N-dihexyl octanamide (DHOA), thus eliminating discrete aqueous phase and free acid usage. Various aspects of dissolution of solid uranium dioxide and extraction of uranium into molecular diluent viz. n-hexane and neoteric solvents viz. room temperature ionic liquid (RTIL) and supercritical carbon dioxide (SC CO2) were studied. The organic adduct was found to have composition DHOA.(HNO3)0.78(H2O)0.4. Adduct miscibility and UO2 dissolution behavior was markedly different for RTIL and n-hexane. The dissolution process, studied by monitoring UV–Vis spectra, was found to be pseudo first order with a rate constant of of 0.074 min−1 and 0.036 min−1 for n-hexane and RTIL respectively. Irrespective of medium, dissolution-extraction efficiency of ≥90% was achievable. Using RTIL for dissolution-extraction medium and SC CO2 for stripping is promising in terms of overall efficiency as well as RTIL recovery by avoiding aqueous cross contamination.
Acknowledgments
The author expresses her sincere gratitude to Dr. P.K. Pujari, Head, RCD and Dr. Neetika Rawat, Head, IICS for their persistent support during the course of this work. Author also thanks Dr. Pravin Verma, RCD for the water content determination by Karl-Fischer titration.
Author contributions: The author has accepted responsibility for the entire content of this submitted manuscript and approved submission.
Research funding: None declared.
Conflict of interest statement: The author reports no conflicts of interest.
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© 2021 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Original Papers
- Gas phase synthesis of 4d transition metal carbonyl complexes with thermalized fission fragments in single-atom reactions
- Extraction of tetra- and hexavalent actinide ions from nitric acid solutions using some diglycolamide functionalized calix[4]arenes
- Uranyl oxalate species in high ionic strength environments: stability constants for aqueous and solid uranyl oxalate complexes
- Comparative study on aqueous acid free UO2 dissolution-extraction using DHOA adduct into room temperature ionic liquid/supercritical carbon dioxide/n-hexane
- Determination of trace uranium in thorium matrix by laser induced fluorimetry after separation of thorium by its fluoride precipitation using NH4HF2
- Development of a fast characterization setup for radionuclide generators demonstrated by a 227Ac-based generator
- Purification of 89Sr from FBTR irradiated Yttria target by extraction chromatography using HDEHP impregnated XAD-7 resin
- Microanalysis and signature of rare earth elements in geochemical samples using neutron activation analysis
Articles in the same Issue
- Frontmatter
- Original Papers
- Gas phase synthesis of 4d transition metal carbonyl complexes with thermalized fission fragments in single-atom reactions
- Extraction of tetra- and hexavalent actinide ions from nitric acid solutions using some diglycolamide functionalized calix[4]arenes
- Uranyl oxalate species in high ionic strength environments: stability constants for aqueous and solid uranyl oxalate complexes
- Comparative study on aqueous acid free UO2 dissolution-extraction using DHOA adduct into room temperature ionic liquid/supercritical carbon dioxide/n-hexane
- Determination of trace uranium in thorium matrix by laser induced fluorimetry after separation of thorium by its fluoride precipitation using NH4HF2
- Development of a fast characterization setup for radionuclide generators demonstrated by a 227Ac-based generator
- Purification of 89Sr from FBTR irradiated Yttria target by extraction chromatography using HDEHP impregnated XAD-7 resin
- Microanalysis and signature of rare earth elements in geochemical samples using neutron activation analysis
