U(VI) Extraction by 8-hydroxyquinoline: a comparison study in ionic liquid and in dichloromethane
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Li-Yong Yuan
Abstract
Room temperature ionic liquids (RTILs) represent a recent new class of solvents with potential application in liquid/liquid extraction based nuclear fuel reprocessing due to their unique physical and chemical properties. The work herein provides a comparison of U(VI) extraction by 8-hydroxyquinoline (HOX) in a commonly used RTIL, i.e. 1-butyl-3-methylimidazolium hexafluorophosphate ([C4mim][PF6]) and in conventional solvent, i.e. dichloromethane (CH2Cl2). The effect of HOX concentration, solution acidity and nitrate ions on the extraction were discussed in detail, and the speciation analyses of the extracted U(VI) were performed. One of the main emphasis of this work is the extraction mechanism of U(VI) extracted from aqueous phase into RTILs and conventional solvent. In CH2Cl2, the extraction occurs through a combination of ion change and neutral complexation, and the extracted complex is proposed as UO2(OX)2HOX. In [C4mim][PF6], although a cation-change mechanism as previously reported for RTILs-based system was involved, the extracted complex of UO2(OX)1.5(HOX)1.5(PF6)0.5 gave a clear indication that the usage of HOX as an acidic extractant markedly inhibited the solubility loss of [C4mim][PF6] during the extraction by leaching H+ to aqueous phase. Moreover, the extracted U(VI) in [C4mim][PF6] can be easily stripped by using 0.01 M nitric acid, which provides a simple way of the ionic liquid recycling.
Funding source: National Natural Science Foundation of China
Award Identifier / Grant number: 21471153
Award Identifier / Grant number: 21577144
Award Identifier / Grant number: U1432103
Funding source: Chinese Academy of Sciences
Award Identifier / Grant number: XDA030104
Funding statement: Financial support from the National Natural Science Foundation of China (Grant No. 21471153, 21577144 and U1432103) and the “Strategic Priority Research Program” of the Chinese Academy of Sciences (Grant No. XDA030104) are gratefully acknowledged.
Acknowledgments
Financial support from the National Natural Science Foundation of China (Grant No. 21471153, 21577144 and U1432103) and the “Strategic Priority Research Program” of the Chinese Academy of Sciences (Grant No. XDA030104) are gratefully acknowledged.
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©2017 Walter de Gruyter GmbH, Berlin/Boston
Articles in the same Issue
- Frontmatter
- Cross section measurements of 75As(α,xn)76,77,78Br and 75As(α,x)74As nuclear reactions using the monitor radionuclides 67Ga and 66Ga for beam evaluation
- U(VI) Extraction by 8-hydroxyquinoline: a comparison study in ionic liquid and in dichloromethane
- Preparation, characterization, uranium (VI) biosorption models, and conditions optimization by response surface methodology (RSM) for amidoxime-functionalized marine fungus materials
- β-Zeolite modified by ethylenediamine for sorption of Th(IV)
- Assessment of surface reactivity of thorium oxide in conditions close to chemical equilibrium by isotope exchange 229Th/232Th method
- Evolution of heavy ions (He2+, H+) radiolytic yield of molecular hydrogen vs. “Track-Segment” LET values
- Radiation induced environmental remediation of Cr(VI) heavy metal in aerated neutral solution under simulated industrial effluent
- Soil depth profiles and radiological assessment of natural radionuclides in forest ecosystem
Articles in the same Issue
- Frontmatter
- Cross section measurements of 75As(α,xn)76,77,78Br and 75As(α,x)74As nuclear reactions using the monitor radionuclides 67Ga and 66Ga for beam evaluation
- U(VI) Extraction by 8-hydroxyquinoline: a comparison study in ionic liquid and in dichloromethane
- Preparation, characterization, uranium (VI) biosorption models, and conditions optimization by response surface methodology (RSM) for amidoxime-functionalized marine fungus materials
- β-Zeolite modified by ethylenediamine for sorption of Th(IV)
- Assessment of surface reactivity of thorium oxide in conditions close to chemical equilibrium by isotope exchange 229Th/232Th method
- Evolution of heavy ions (He2+, H+) radiolytic yield of molecular hydrogen vs. “Track-Segment” LET values
- Radiation induced environmental remediation of Cr(VI) heavy metal in aerated neutral solution under simulated industrial effluent
- Soil depth profiles and radiological assessment of natural radionuclides in forest ecosystem
