التفاصيل البيبلوغرافية
| العنوان: |
A sustainable peroxide assisted dissolution of uranium oxides in ionic liquids and electrochemical Recovery: A feasibility study. |
| المؤلفون: |
Goyal, Priya1 (AUTHOR), Sengupta, Arijit1,2 (AUTHOR) arijita@barc.gov.in, Srivastava, Ashutosh1 (AUTHOR), Mukherjee, Sumanta3 (AUTHOR), Kumar Mohapatra, Prasanta1,2 (AUTHOR) mpatra@barc.gov.in |
| المصدر: |
Journal of Molecular Liquids. Sep2024, Vol. 409, pN.PAG-N.PAG. 1p. |
| مصطلحات موضوعية: |
*URANIUM oxides, *OXIDIZING agents, *COPPER, *SURFACE morphology, *IONIC liquids |
| مستخلص: |
[Display omitted] • The feasibility of ionic liquid based non-aqueous reprocessing of UO 2 has been demonstrated. • Oxidative room temperature dissolution in C 8 mim.NTf 2 containing HDEHP. • Electro-deposition on Cu plate as black UO 2. • The dissolution was found to be endothermic. • The extent of followed the trend UO 3 > UO 2 > U 3 O 8. The present manuscript demonstrated the dissolution of oxides of uranium , mainly UO 2 , via surface oxidation by H 2 O 2 into ionic liquid at ambient temperature within 4 h of equilibration. The dissolution was found to be endothermic (ΔH ∼ 30.8 kJ mol-1 and 3.20 kJ mol-1) predominantly following the pseudo 2nd order rate kinetics (k ∼ 0.004 g−1 min and 0.0009 g−1 min) with activation energies of 54.12 J mol-1 and 26.69 J mol-1, for H 2 O 2 and RCO 3 H, respectively. The extent of dissolution for different oxides of uranium followed the trend UO 3 > UO 2 > U 3 O 8. Within 8 h of equilibration, quantitative dissolution of 50 mg mL−1 of UO 2 can be achieved with optimized experimental conditions of 0.4 M HD2EHP as the complexing agent and 10 µL H 2 O 2 as the oxidizing agent. The oxidative dissolution followed the trend C 8 mim.NTf 2 > C 8 mim.PF 6. In C 8 mim.NTf 2 , the most probable species was UO 2 (HDEHP)2+ associated to Σ g +→Γ g transition involving the σ u +ϕ u configuration with a D 3d (D 3) symmetry; while for C 8 mim.PF 6 the predominate species was UO 2 F 2 (HDEHP)- with a D 3h symmetry. Four hours of electro-deposition resulted a black solid deposit on the Cu electrode resulting the change in surface morphology and enhancement in the surface roughness as analyzed by the SEM images. The EDXRF analysis revealed the presence of the uranium peak; whereas the XRD pattern showed the fluorite structure revealing the deposit of UO 2 phase upon electro-deposition latter confirmed by FTIR. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
Academic Search Index |