Extraction of uranium(VI) and plutonium(IV) with some high molecular weight aliphatic monoamides from nitric acid medium

Nair, G. M.; Mahajan, G. R.; Prabhu, D. R.

doi:10.1007/bf02038228

Cited by 29 publications

(13 citation statements)

References 8 publications

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“…It is thus desirable to identify new families of extractants among which N,N-dialkyl amides are the most serious alternative candidates and have received increasing attention. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19] One of the very interesting feature of N,N-dialkyl amides is the strong influence of their alkyl groups on their extraction properties. It gives the possibility to tune their extracting strength and selectivity toward uranium (VI) and plutonium (IV) by altering the length and branching of monoamide alkyl chains.…”

Section: Introductionmentioning

confidence: 99%

Structures of Plutonium(IV) and Uranium(VI) with N,N-Dialkyl Amides from Crystallography, X-ray Absorption Spectra, and Theoretical Calculations

et al. 2016

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The structures of plutonium(IV) and uranium(VI) ions with a series of N,N-dialkyl amides ligands with linear and branched alkyl chains were elucidated from single-crystal X-ray diffraction (XRD), extended X-ray absorption fine structure (EXAFS), and theoretical calculations. In the field of nuclear fuel reprocessing, N,N-dialkyl amides are alternative organic ligands to achieve the separation of uranium(VI) and plutonium(IV) from highly concentrated nitric acid solution. EXAFS analysis combined with XRD shows that the coordination structure of U(VI) is identical in the solution and in the solid state and is independent of the alkyl chain: two amide ligands and four bidentate nitrate ions coordinate the uranyl ion. With linear alkyl chain amides, Pu(IV) also adopt identical structures in the solid state and in solution with two amides and four bidentate nitrate ions. With branched alkyl chain amides, the coordination structure of Pu(IV) was more difficult to establish unambiguously from EXAFS. Density functional theory (DFT) calculations were consequently performed on a series of structures with different coordination modes. Structural parameters and Debye-Waller factors derived from the DFT calculations were used to compute EXAFS spectra without using fitting parameters. By using this methodology, it was possible to show that the branched alkyl chain amides form partly outer-sphere complexes with protonated ligands hydrogen bonded to nitrate ions.

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Section: Introductionmentioning

confidence: 99%

Structures of Plutonium(IV) and Uranium(VI) with N,N-Dialkyl Amides from Crystallography, X-ray Absorption Spectra, and Theoretical Calculations

et al. 2016

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“…Numerous approaches have been used to characterize these complexes, for example, distribution ratio measurements [4,7,8,[12][13][14][15][16], spectroscopic characterization [4,[16][17][18], and thermodynamic data measurements [7,8,13,15,19]. While classical solution chemistry methods are informative and helpful in providing insight into the coordination behavior of Pu(IV) with these ligands, there are only a few publications on the use of electrospray ionization mass spectrometry (ESI-MS) to obtain information on Pu(IV) complexes in solution.…”

Section: Introductionmentioning

confidence: 99%

“…Indeed dialkylamides have been under study as potential candidates for plutonium extraction since the 1960's [10]. Some advantages monoamides offer over TBP include the ability to easily remove degradation products from the solvent stream, their complete incinerability [3,9,11], and the important influence of the alkyl groups R, R 0 , and R 00 on the extraction of Pu(IV) [4,5,7,9,[11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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Redox behavior of gas phase Pu(IV)-monodentate ligand complexes: an investigation by electrospray ionization mass spectrometry

Drader¹,

Martin²,

Boubals³

et al. 2016

J Radioanal Nucl Chem

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This study reports the gas phase complexation behavior of Pu(IV) with N,N-dialkylamide ligands and tributylphosphate by electrospray ionization mass spectrometry. In-source collision induced dissociation (CID) and ion trap collision induced dissociation were used to investigate the kinetic stability of Pu species in the gas phase. With both class of ligands, N,N-dialkylamide and trialkylphosphate, oxidation of Pu from the tetravalent state to the hexavalent state was observed at both high skimmer voltages and during ion trap CID. The results suggest that oxidation is due to the presence of a nitrate group in the coordination sphere of the metal and is independent of the ligand.

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“…Various amine and amide based extractants have been employed in the uranium recovery and possible separation from other associated elements at different acidic media [1][2][3][4][5][6][7][8][9][10][11][12] .…”

Section: Introductionmentioning

confidence: 99%

Separation of Uranium(VI) and Vanadium(V) from Sulfuric Acid Media by Amine Based Extractants through Liquid-liquid Extraction Technique#

Jeon¹,

Lee²,

Kim³

et al. 2021

Resour. Recycl.

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The importance of uranium metal is growing day by day in light of its increasing global demand for fulfilling societal needs through atomic power programs. Considering the high demand for uranium, it is necessary to find innovative hydrometallurgical techniques to separate uranium from other associated elements, especially vanadium. This study deals with the separation of uranium(VI) and vanadium(V) from sulfuric acid solutions using commercial amine-based extractants diluted in kerosene. The concentrations of the sulfuric acid solutions ranged from 0.005 to 5.0 mol/L. The effect of extractant concentration ranging from 0.005 to 0.2 mol/L was studied. The temperature was maintained at 25°C and the experiment was performed for 30 min at an aqueous: organic phase ratio of 1 (A:O = 1:1). The calculated separation factors (SFs) are presented and comparisons are made among all the experiments.

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Extraction of uranium(VI) and plutonium(IV) with some high molecular weight aliphatic monoamides from nitric acid medium

Cited by 29 publications

References 8 publications

Structures of Plutonium(IV) and Uranium(VI) with N,N-Dialkyl Amides from Crystallography, X-ray Absorption Spectra, and Theoretical Calculations

Structures of Plutonium(IV) and Uranium(VI) with N,N-Dialkyl Amides from Crystallography, X-ray Absorption Spectra, and Theoretical Calculations

Redox behavior of gas phase Pu(IV)-monodentate ligand complexes: an investigation by electrospray ionization mass spectrometry

Separation of Uranium(VI) and Vanadium(V) from Sulfuric Acid Media by Amine Based Extractants through Liquid-liquid Extraction Technique#

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