Journal ArticleDOI
Uranyl(VI) nitrate salts: modeling thermodynamic properties using the binding mean spherical approximation theory and determination of "fictive" binary data.
Alexandre Ruas,Olivier Bernard,Barbara Caniffi,Jean-Pierre Simonin,Pierre Turq,Lesser Blum,Philippe Moisy +6 more
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TLDR
A new resolution of the binding mean spherical approximation (BIMSA) theory, taking into account 1-1 and also 1-2 complex formation, is developed and used to reproduce, from a simple procedure, experimental uranyl nitrate osmotic coefficient variation with concentration.Abstract:
This work is aimed at a description of the thermodynamic properties of highly concentrated aqueous solutions of uranyl nitrate at 25 °C. A new resolution of the binding mean spherical approximation (BIMSA) theory, taking into account 1-1 and also 1-2 complex formation, is developed and used to reproduce, from a simple procedure, experimental uranyl nitrate osmotic coefficient variation with concentration. For better consistency of the theory, binary uranyl perchlorate and chloride osmotic coefficients are also calculated. Comparison of calculated and experimental values is made. The possibility of regarding the ternary system UO2(NO3)2/ HNO3/H2O as a “simple” solution (in the sense of Zdanovskii, Stokes, and Robinson) is examined from water activity and density measurements. Also, an analysis of existing uranyl nitrate binary data is proposed and compared with our obtained data. On the basis of the concept of “simple” solution, values for density and water activity for the binary system UO2(NO3)2/H2O are proposed in a concentration range on which uranyl nitrate precipitates from measurements on concentrated solutions of the ternary system UO 2(NO3)2/ HNO3/H2O. This new set of binary data is “fictive” in the sense that the real binary system is not stable chemically. Finally, a new, interesting predictive capability of the BIMSA theory is shown.read more
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Journal ArticleDOI
Understanding the Extraction Mechanism in Ionic Liquids: UO2 2+/HNO3/TBP/C4-mimTf2N as a Case Study
TL;DR: In this paper, the authors proposed a chemical model to describe the data through a fit of uranyl distribution ratios, while some other suggestions are unable to do so, and proposed to proceed via cation exchange at low initial acidities and via anion exchange at high HNO3 concentrations.
Journal ArticleDOI
Can electrospray mass spectrometry quantitatively probe speciation? Hydrolysis of uranyl nitrate studied by gas-phase methods.
Nikos G. Tsierkezos,Nikos G. Tsierkezos,Jana Roithová,Jana Roithová,Detlef Schröder,Milan Ončák,Petr Slavíček +6 more
TL;DR: A detailed investigation of the concentration-dependent behavior of the formed gaseous uranyl complexes reveals a preference for nitrate- over hydroxide-containing species with increasing concentration of the sprayed solution.
Journal ArticleDOI
Comparison of uranyl extraction mechanisms in an ionic liquid by use of malonamide or malonamide-functionalized ionic liquid
Marieke Bonnaffé-Moity,Ali Ouadi,Valérie Mazan,S. I. Miroshnichenko,Dariia Ternova,Sylvia Georg,Michal Sypula,Clotilde Gaillard,Isabelle Billard +8 more
TL;DR: The FIL-MA molecule is more efficient than its classical DMDBMA parent, and through anion exchange of [UO(2)(NO(3))(3)](-)versus Tf(2)N(-) for both ligands at high HNO( 3) concentrations.
Journal ArticleDOI
Molecular Dynamics Studies of Concentrated Binary Aqueous Solutions of Lanthanide Salts: Structures and Exchange Dynamics
TL;DR: From MD simulations, it appears that the affinity of anions (perchlorate, chloride, and nitrate) is stronger for Nd(3+) than Dy(3+), while from UV-visible experiments, the stronger affinity of nitrate anions toward Ln( 3+) compared to perchlorates and chlorides is highlighted.
Journal ArticleDOI
Speciation of Uranyl Nitrato Complexes in Acetonitrile and in the Ionic Liquid 1-Butyl-3-methylimidazolium Bis(trifluoromethylsulfonyl)imide
Kelly Servaes,Christoph Hennig,Isabelle Billard,Clotilde Gaillard,Koen Binnemans,Christiane Görller-Walrand,Rik Van Deun +6 more
TL;DR: In this paper, a trinitrato complex between the uranyl ion and nitrate ions in acetonitrile and the ionic liquid 1-butyl-3-methylimidazolium bis(trifluoromethylsulfonyl)imide ([C4mim][Tf2N]) has been studied by absorption, magnetic circular dichroism (MCD) and uranium LIII EXAFS spectroscopy.
References
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Journal ArticleDOI
Osmotic Coefficients and Mean Activity Coefficients of Uni‐univalent Electrolytes in Water at 25°C
Walter J Hamer,Yung-Chi Wu +1 more
TL;DR: In this paper, the osmotic coefficients and mean activity coefficients of uni-univalent electrolytes in aqueous solutions at 25 °C were derived using the molality or weight basis.
BookDOI
The chemistry of the actinide elements
TL;DR: In this paper, the authors present a comparative analysis of the actinide elements and their properties, including properties of organoactinide compounds having metal-carbon bonds only to?-bonded ligands.
Book
Update on the chemical thermodynamics of uranium, neptunium, plutonium, americium and technetium
R. Guillaumont,Federico Mompean +1 more
TL;DR: The NEA TDB Project Phase II Phase II Editor's note as discussed by the authors discusses new data selection for neptunium, plutonium, and technetium and discusses new auxiliary data selection.
Journal ArticleDOI
Interactions in Aqueous Nonelectrolyte Solutions. I. Solute-Solvent Equilibria
R. H. Stokes,R. A. Robinson +1 more
Journal ArticleDOI
Mean spherical model for asymmetric electrolytes
TL;DR: In this paper, the mean spherical approximation for the primitive model of electrolytic solutions is solved for the most general case of an arbitrary charge and size, and the excess thermodynamic properties are scaled to the charge and the size by means of a rational expression involving a single parameter.
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