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Kalintsev A, Guan Q, Brugger J, Migdisov A, Etschmann B, Ram R, Liu W, Mei Y, Testemale D, Xu H. Nature and coordination geometry of geologically relevant aqueous Uranium(VI) complexes up to 400 ºC: A review and new data. JOURNAL OF HAZARDOUS MATERIALS 2023; 452:131309. [PMID: 37018892 DOI: 10.1016/j.jhazmat.2023.131309] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 03/23/2023] [Accepted: 03/26/2023] [Indexed: 06/19/2023]
Abstract
The structure of the uranyl aqua ion (UO22+) and a number of its inorganic complexes (specifically, UO2Cl+, UO2Cl20, UO2SO40, [Formula: see text] , [Formula: see text] and UO2OH42-) have been characterised using X-Ray absorption spectroscopy/extended X-Ray absorption fine structure (XAS/EXAFS) at temperatures ranging from 25 to 326 ºC. Results of ab initio molecular dynamics (MD) calculations are also reported for uranyl in chloride and sulfate-bearing fluids from 25 to 400 ºC and 600 bar to 20 kilobar (kb). These results are reported alongside a comprehensive review of prior structural characterisation work with particular focus given to EXAFS works to provide a consistent and up-to-date view of the structure of these complexes under conditions relevant to U mobility in ore-forming systems and around high-grade nuclear waste repositories. Regarding reported EXAFS results, average equatorial coordination was found to decrease in uranyl and its sulfate and chloride complexes as temperature rose - the extent of this decrease differed between species and solution compositions but typically resulted in an equatorial coordination number of ∼3-4 at temperatures above 200 ºC. The [Formula: see text] complex was observed at temperatures from 25 to 247 ºC and exhibited no major structural changes over this temperature range. UO2OH42- exhibited only minor structural changes over a temperature range from 88 to 326 ºC and was suggested to manifest fivefold coordination with four hydroxyl molecules and one water molecule around its equator. Average coordination values derived from fits of the reported EXAFS data were compared to average coordination values calculated using the experimentally derived thermodynamic data for chloride complexes reported by Dargent et al. (2013) and Migdisov et al. (2018b), and for sulfate complexes reported by Alcorn et al. (2019) and Kalintsev et al. (2019). Sulfate EXAFS data were well described by available thermodynamic data, and chloride EXAFS data were described well by the thermodynamic data of Migdisov et al. (2018b), but not by the data of Dargent et al. (2013). The ab initio molecular dynamics calculations confirmed the trends in equatorial coordination observed with EXAFS and were also able to provide an insight into the effect of pressure in equatorial water coordination - for a given temperature, higher pressures appear to lead to a greater number of equatorially bound waters counteracting the temperature effect.
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Affiliation(s)
- Alexander Kalintsev
- School of Earth, Atmosphere and Environment, Monash University, 9 Rainforest Walk, VIC 3800, Australia; Los Alamos National Laboratory, Earth & Environmental Division, Los Alamos, NM, USA.
| | - Qiushi Guan
- CSIRO Mineral Resources, Kensington, WA 6151, Australia
| | - Joël Brugger
- School of Earth, Atmosphere and Environment, Monash University, 9 Rainforest Walk, VIC 3800, Australia
| | - Artas Migdisov
- Los Alamos National Laboratory, Earth & Environmental Division, Los Alamos, NM, USA
| | - Barbara Etschmann
- School of Earth, Atmosphere and Environment, Monash University, 9 Rainforest Walk, VIC 3800, Australia
| | - Rahul Ram
- School of Earth, Atmosphere and Environment, Monash University, 9 Rainforest Walk, VIC 3800, Australia
| | - Weihua Liu
- CSIRO Mineral Resources, Kensington, WA 6151, Australia
| | - Yuan Mei
- CSIRO Mineral Resources, Kensington, WA 6151, Australia
| | - Denis Testemale
- CNRS, Université Grenoble Alpes, Institut NEEL, Grenoble F-38000, France
| | - Hongwu Xu
- Los Alamos National Laboratory, Earth & Environmental Division, Los Alamos, NM, USA
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Shang C, Coreau N, Macé N, Descostes M, Reiller PE. Implications of recently derived thermodynamic data and specific ionic interaction theory parameters for (Mg/Ca) nUO 2(CO 3) 3(4-2n)- complexes on the predominance of the Mg 2+-Ca 2+-UO 22+-OH --CO 32- systems, and application to natural and legacy-mine waters. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 858:159927. [PMID: 36343816 DOI: 10.1016/j.scitotenv.2022.159927] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 10/24/2022] [Accepted: 10/30/2022] [Indexed: 06/16/2023]
Abstract
The formation of alkaline earth(II)triscarbonatouranyl(VI) (AenUO2(CO3)3(4-2n)-) species that have been evidenced both in laboratory and in-field studies, is important from slightly acidic pH up to near degraded cementitious in carbonated waters. They are also showing distinctive luminescence properties with a hypsochromic shift relative to UO22+. The conditions of pH, activities of alkaline earth(II) free ions (mostly Mg2+ and Ca2+) and carbonate ions (HCO3-) can be predicted from the thermodynamic functions and constants. The predictive validity of the activity of major alkaline ions (mostly Na+) is determined from the models used to describe the ionic strength comportment of these species, particularly using coefficients from the specific ion interaction theory (SIT). The stability domains of these species are better defined as a function of the activity of the constituents, and applied to natural waters. In this work, using recently obtained complete thermodynamic data and SIT coefficients, we will draw the stability domains of the AenUO2(CO3)3(4-2n)- species in combinations of activities of H+, HCO3-, Mg2+, Ca2+, and Na+ for a wide selection of water compositions from the literature. Water samples were collected near a French mining legacy-site (Site du Bosc, Lodève, France). After determining the major ion compositions, we will verify that the luminescence signal of uranium is in agreement with the predicted speciation in the stability domains.
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Affiliation(s)
- Chengming Shang
- Université Paris-Saclay, CEA, Service d'Études Analytiques et de Réactivité des Surfaces (SEARS), F-91191 Gif-sur-Yvette CEDEX, France
| | - Nathalie Coreau
- Université Paris-Saclay, CEA, Service d'Études du Comportement des Radionucléïdes (SECR), F-91191 Gif-sur-Yvette CEDEX, France
| | - Nathalie Macé
- Université Paris-Saclay, CEA, Service d'Études du Comportement des Radionucléïdes (SECR), F-91191 Gif-sur-Yvette CEDEX, France
| | - Michael Descostes
- ORANO Mining, Environmental R&D Department, 125 Avenue de Paris, 92330 Châtillon, France; PSL University/Mines ParisTech, Centre de Géosciences, 35 rue Saint-Honoré, 77305 Fontainebleau, France
| | - Pascal E Reiller
- Université Paris-Saclay, CEA, Service d'Études Analytiques et de Réactivité des Surfaces (SEARS), F-91191 Gif-sur-Yvette CEDEX, France.
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Chemical thermodynamics of ternary M-An(VI)-CO 3 system (M = Mg, Ca, Sr, and Ba). RADIOCHIM ACTA 2022. [DOI: 10.1515/ract-2021-1133] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
This review provides an overview of the chemical thermodynamics on ternary earth-alkaline metal-actinyl-tricarbonate systems (i.e., M-AnO2-CO3, M = Mg, Ca, Sr, and Ba) and discusses the aqueous complexation and dissolution/precipitation equilibrium for these ternary aqueous systems. The aqueous ternary U(VI) carbonate species are remarkably predominant in the U(VI) speciation under natural environmental conditions at ambient temperature and moderate ionic strength condition, while the omnipresence, according to recent studies, would be hindered by an increase in temperature and ionic strength. With respect to the ternary solid U(VI) carbonate phases, most of the previously reported data have been focused on physical properties and thus a notable lack of available data on chemical thermodynamic properties, i.e., solubility product constant, has been identified. Nevertheless, substantial influences of these ternary M-AnO2-CO3 systems on the aqueous speciation and the solubility limiting phase under the natural environmental condition are taken into account according to the thermodynamic calculation. The authors point out that the completeness of the chemical thermodynamic model for predicting the chemical behavior of actinides in nature can be further improved on the basis of a sufficient understanding of ternary M-AnO2-CO3 systems.
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Luan XF, Wang CZ, Wu QY, Lan JH, Chai ZF, Xia LS, Shi WQ. Theoretical Insights on Improving Amidoxime Selectivity for Potential Uranium Extraction from Seawater. J Phys Chem A 2022; 126:406-415. [PMID: 35020373 DOI: 10.1021/acs.jpca.1c08072] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Extraction of uranium from seawater is one of the important ways to solve the shortage of terrestrial uranium resources. Thereinto, the competition between uranyl and vanadium cations is a significant challenge in the commonly used amidoxime-based adsorbents for extracting uranium from seawater. An in-depth understanding of the extraction behaviors of modified amidoxime groups with uranyl and vanadium ions is one of the effective means to design and develop efficient adsorbents for selective uranium sequestration. In this work, we have designed and systematically investigated the alkyl and amino functionalized amidoxime, (Z)-2-amino-N'-hydroxy-N,N-dimethylbenzimidamide (L1), and its phenyl and methoxy derivatives ((Z)-3-amino-N'-hydroxy-N,N-dimethyl-2-naphthimidamide (L2) and (Z)-2-amino-N'-hydroxy-4-methoxy-N,N-dimethylbenzimidamide (L3)) by quantum chemistry calculations. In the uranyl complexes, the amidoxime groups prefer to act as η2-coordinated ligands as the amidoximes increase, and there exist substantial hydrogen bond interactions, which are different from the vanadium complexes. Various bonding analyses show that the L1 ligand possesses a stronger binding affinity to UO22+, and the -C6H5 and -CH3O substituent groups seem to have no effect on the improvement of extraction ability. Thermodynamic analysis confirms that the L1 ligand has a stronger extraction capability to uranyl ion compared to L2 and L3. According to the calculations of the vanadium (V) (VO2+ and VO3+) complexes with the L1 ligand, L1 is more likely to react with [H2VO4]- and [HVO4]2- to form VO2+ complexes. Expectantly, thermodynamic analysis displays a higher extraction capacity for uranyl ions than vanadium ions. Therefore, these alkyl and amino functionalized amidoxime ligands demonstrate high selectivity for uranyl over vanadium ions, which is mainly due to the coordination mode changes of these ligands toward vanadium in conjunction with the considerable hydrogen bonds in the uranyl complexes. These results are expected to afford useful clues for the design of efficient adsorbents for uranium extraction from seawater.
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Affiliation(s)
- Xue-Fei Luan
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.,School of Nuclear Science and Technology, University of South China, Hengyang 421001, Hunan Province, China
| | - Cong-Zhi Wang
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Qun-Yan Wu
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Jian-Hui Lan
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
| | - Zhi-Fang Chai
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China.,Engineering Laboratory of Advanced Energy Materials, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
| | - Liang-Shu Xia
- School of Nuclear Science and Technology, University of South China, Hengyang 421001, Hunan Province, China
| | - Wei-Qun Shi
- Laboratory of Nuclear Energy Chemistry, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China
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Shang C, Reiller PE. Effect of temperature on the complexation of triscarbonatouranyl(VI) with calcium and magnesium in NaCl aqueous solution. Dalton Trans 2021; 50:17165-17180. [PMID: 34781338 DOI: 10.1039/d1dt03204f] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The complex formation of triscarbonatouranyl(VI) UO2(CO3)34- with the alkaline earth metal ions Mg2+ and Ca2+ in 0.10 mol kgw-1 NaCl was studied at variable temperatures: 5-30 °C for Mg2+ and 10-50 °C for Ca2+. Under appropriate conditions, the ternary complexes (MnUO2(CO3)3(4-2n)- with n = 1 for Mg, n = {1; 2} for Ca) were identified by time-resolved laser-induced luminescence spectrometry. Their pure spectral components at 50 °C for CanUO2(CO3)3(4-2n)- and 30 °C for MgUO2(CO3)32- were recovered by multivariate curve resolution alternating least-squares analysis. Approximation models were tested to fit the experimental data-the equilibrium constants of complexation measured at different temperatures-and deduce the thermodynamic functions, i.e., enthalpy, entropy, and heat capacity. The weak influence of temperature on complexation constants induces large uncertainties in terms of thermodynamic functions. Assuming the enthalpy is constant with temperature using the Van't Hoff equation, the first stepwise complexation of UO2(CO3)34- by Ca2+ is estimated to be slightly endothermic, with , while the second stepwise complexation of CaUO2(CO3)32- by Ca2+ with is slightly exothermic, . In contrast to Ca2+, the complexation of UO2(CO3)34- by Mg2+ is slightly exothermic, with . These values are not significantly different from zero inasmuch as the uncertainties are important due to a weak dependence of log10 K° values. The entropic character of the complexation is verified as for the first stepwise complexation of UO2(CO3)34- by Ca2+, for the second stepwise complexation of CaUO2(CO3)32- by Ca2+, and for the complexation of UO2(CO3)34- by Mg2+. The energetics of complexation and sensitivity analysis of the model estimates with temperature are discussed. The uranium speciation in the case of the safety of nuclear waste management, using the present thermodynamic functions, provides support to the assessment of underground nuclear waste repositories.
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Affiliation(s)
- Chengming Shang
- Université Paris-Saclay, CEA, Service d'Études Analytiques et de Réactivité des Surfaces (SEARS), F-91191 Gif-sur-Yvette CEDEX, France.
| | - Pascal E Reiller
- Université Paris-Saclay, CEA, Service d'Études Analytiques et de Réactivité des Surfaces (SEARS), F-91191 Gif-sur-Yvette CEDEX, France.
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Shang C, Reiller PE. The determination of the thermodynamic constants of MgUO 2(CO 3) 32- complex in NaClO 4 and NaCl media by time-resolved luminescence spectroscopy, and applications in different geochemical contexts. Dalton Trans 2021; 50:4363-4379. [PMID: 33693449 DOI: 10.1039/d0dt04124f] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The formation constants and specific ion interaction coefficients of MgUO2(CO3)32- complex were determined in 0.1 to 1.0 mol kgw-1 NaCl and 0.10 to 2.21 mol kgw-1 NaClO4 media in the framework of the specific ion interaction theory (SIT), by time-resolved laser-induced luminescence spectroscopy. The upper limits of ionic strength were chosen in order to limit luminescence quenching effects generated by high concentrations of Cl- and ClO4- already observed during our earlier studies on CanUO2(CO3)3(4-2n)- complexes (Shang & Reiller, Dalton Trans., 49, 466; Shang et al., Dalton Trans., 49, 15443). The cumulative formation constant determined is , and the specific ion interaction coefficients are ε(MgUO2(CO3)32-, Na+) = 0.19 ± 0.11 kgw mol-1 in NaClO4 and ε(MgUO2(CO3)32-, Na+) = 0.09 ± 0.16 kgw mol-1 in NaCl. Two gratings of 300 and 1800 lines per mm were used to acquire MgUO2(CO3)32- luminescence spectra, where the high-resolution 1800 lines per mm grating detected slight spectral shifts for the principal luminescent bands relative to CanUO2(CO3)3(4-2n)-. The applications of the consistent set of thermodynamic constants and ε values for MnUO2(CO3)3(4-2n)- (M = Mg and Ca) were examined in different geochemical contexts, where Mg over Ca concentration ratio varies to help defining the relative importance of these species.
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Affiliation(s)
- Chengming Shang
- Université Paris-Saclay, CEA, Service d'Études Analytiques et de Réactivité des Surfaces (SEARS), F-91191 Gif-sur-Yvette CEDEX, France.
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7
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Shang C, Reiller PE, Vercouter T. Spectroluminescence measurements of the stability constants of Ca nUO 2(CO 3) 3(4-2n)- complexes in NaClO 4 medium and the investigation of interaction effects. Dalton Trans 2020; 49:15443-15460. [PMID: 33140787 DOI: 10.1039/d0dt03164j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
The stability constants of ternary calcium uranyl tricarbonate complexes, CaUO2(CO3)32- and Ca2UO2(CO3)3(aq), were determined in NaClO4 medium at various ionic strengths using time-resolved laser-induced luminescence spectroscopy (TRLS) - also known as time-resolved laser-induced fluorescence spectroscopy (TRLFS). As in a previous study, the potential precipitation of schoepite (UO3·2H2O) and calcite (CaCO3) was avoided via titration of the triscarbonatouranyl complex with Ca2+ at varying pH values. The Ringböm coefficients relative to UO2(CO3)34- were individually evaluated under test sample conditions. Steadily enhanced luminescence intensity and increased decay-times were representative of complexation processes. The stoichiometry of calcium was quantified by slope analysis, and its measured intensity was corrected by using the corresponding Ringböm coefficient. The conditional formation constants, i.e. log10 Kn.1.3, were then assessed after rounding off the slope values to their nearest integers. Cumulative formation constants at infinite dilution log10 β°n.1.3, and specific ion interaction parameters ε were determined based on the experimental origin and slope values, respectively, over the range of 0.1-2.46 mol kgw-1 NaClO4 using the specific ion interaction theory (SIT) approach. The cumulative stability constants are log10 β°(CaUO2(CO3)32-) = 27.26 ± 0.04 and log10 β°(Ca2UO2(CO3)3(aq)) = 30.53 ± 0.06. The specific ion interaction coefficients are estimated to be ε(CaUO2(CO3)32-,Na+) = (0.02 ± 0.04) kgw mol-1 and ε(Ca2UO2(CO3)3(aq),NaClO4) = (0.18 ± 0.07) kgw mol-1. These latter values are different from the ones that were previously obtained in NaCl, and underlying causes are discussed from different aspects. This work provides valuable information to address the interaction effects between Ca-UO2-CO3 species and 1 : 1 type electrolytes. It is suggested that the affinity of the cation in a background electrolyte with CanUO2(CO3)3(4-2n)- (n = {1;2}) has to be taken into consideration at high ionic strengths, especially for globally non-charged species.
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Affiliation(s)
- Chengming Shang
- Université Paris-Saclay, CEA, Service d'Études Analytiques et de Réactivité des Surfaces (SEARS), F-91191 Gif-sur-Yvette CEDEX, France.
| | - Pascal E Reiller
- Université Paris-Saclay, CEA, Service d'Études Analytiques et de Réactivité des Surfaces (SEARS), F-91191 Gif-sur-Yvette CEDEX, France.
| | - Thomas Vercouter
- Université Paris-Saclay, CEA, Service d'Études Analytiques et de Réactivité des Surfaces (SEARS), F-91191 Gif-sur-Yvette CEDEX, France.
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Oher H, Vercouter T, Réal F, Shang C, Reiller PE, Vallet V. Influence of Alkaline Earth Metal Ions on Structures and Luminescent Properties of Na mM nUO 2(CO 3) 3(4-m-2n)- (M = Mg, Ca; m, n = 0-2): Time-Resolved Fluorescence Spectroscopy and Ab Initio Studies. Inorg Chem 2020; 59:15036-15049. [PMID: 33000939 DOI: 10.1021/acs.inorgchem.0c01986] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The luminescence spectra of triscarbonatouranyl complexes were determined by experimental and theoretical methods. Time-resolved laser-induced fluorescence spectroscopy was used to monitor spectra of uranyl and bicarbonate solutions at 0.1 mol kgw-1 ionic strength and pH ca. 8. The concentrations of Mg2+ and Ca2+ in the samples were chosen in order to vary the proportions of the alkaline earth ternary uranyl complexes MgUO2(CO3)32-, CaUO2(CO3)32-, and Ca2UO2(CO3)3. The luminescence spectrum of each complex was determined by decomposition in order to compare it with the simulated spectra of model structures NamMnUO2(CO3)3(4-m-2n)- (M = Mg, Ca; m, n = 0-2) obtained by quantum chemical methods. The density functional theory (DFT) and time-dependent (TD)-DFT methods were used with the PBE0 functional to optimize the structures in the ground and excited states, respectively, including relativistic effects at the spin-free level, and water solvent effects using a continuum polarizable conductor model. The changes in the structural parameters were quantified with respect to the nature and the amount of alkaline earth counterions to explain the luminescence spectra behavior. The first low-lying excited state was successfully computed, together with the vibrational harmonic frequencies. The DFT calculations confirmed that uranyl luminescence originates from electronic transitions from one of the four nonbonding 5f orbitals of uranium to an orbital that has a uranyl-σ (5f, 6d) character mixed with the 2p atomic orbitals of the carbonate oxygens. Additional single-point calculations using the more accurate TD-DFT/CAM-B3LYP allow one to determine the position of the luminescence "hot band" for each structure in the range 467-476 nm and compared fairly well with experimental reports at around 465 nm. The complete luminescence spectra were built from theoretical results with the corresponding assignment of the electronic transitions and vibronic modes involved, mainly the U-Oax stretching mode. The resulting calculated spectra showed a very good agreement with experimental band positions and band spacing attributed to MgUO2(CO3)32-, CaUO2(CO3)32-, and Ca2UO2(CO3)3. The evolution of luminescence intensities with the number of alkaline earth metal ions in the structure was also correctly reproduced.
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Affiliation(s)
- Hanna Oher
- Service d'Études Analytiques et de Réactivité des Surfaces, Université Paris-Saclay, CEA, 91191 Gif-sur-Yvette, France.,UMR 8523-PhLAM-Physique des Lasers Atomes et Molécules, Université de Lille, CNRS, 59000 Lille, France
| | - Thomas Vercouter
- Service d'Études Analytiques et de Réactivité des Surfaces, Université Paris-Saclay, CEA, 91191 Gif-sur-Yvette, France
| | - Florent Réal
- UMR 8523-PhLAM-Physique des Lasers Atomes et Molécules, Université de Lille, CNRS, 59000 Lille, France
| | - Chengming Shang
- Service d'Études Analytiques et de Réactivité des Surfaces, Université Paris-Saclay, CEA, 91191 Gif-sur-Yvette, France
| | - Pascal E Reiller
- Service d'Études Analytiques et de Réactivité des Surfaces, Université Paris-Saclay, CEA, 91191 Gif-sur-Yvette, France
| | - Valérie Vallet
- UMR 8523-PhLAM-Physique des Lasers Atomes et Molécules, Université de Lille, CNRS, 59000 Lille, France
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Reiller PE, Descostes M. Development and application of the thermodynamic database PRODATA dedicated to the monitoring of mining activities from exploration to remediation. CHEMOSPHERE 2020; 251:126301. [PMID: 32145577 DOI: 10.1016/j.chemosphere.2020.126301] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Revised: 11/19/2019] [Accepted: 02/20/2020] [Indexed: 06/10/2023]
Abstract
A growing demand exists on the monitoring of both uranium mining activities and their environmental impacts. In order to help understanding and modelling both these aspects, a thermodynamic database dedicated to uranium mining activities is developed: the PRODATA database. Relevant species and phases for uranium and radium are chosen from existing compilations of data, complemented with important missing data for the application to mining activities and environmental monitoring. Important major anions and cations chemistry are included, as well as secondary pollutants such as arsenic, lead, or nickel. Applications of the PRODATA extracted database file for PhreeqC to theoretical speciation calculations of uranium and radium for actual water compositions - either linked to uranium mining activities, or under monitoring for environmental survey - are presented. Wider applications to other available water compositions from different geochemical concepts are also tested. For the tested cases, the major radium and uranium species obtained using PRODATA are compared with other available thermodynamic database (Thermochimie, LLNL, Wateq4f, Minteq, PSI/NAGRA). The choice of the database file - and of the ionic strength correction - can strongly impact the final speciation results. Sulphate complexes of radium and uranium are of particular importance in mining exploitation context, and carbonate uranium complexes - particularly [Formula: see text] complexes - are crucial for environmental monitoring. The latter complexes are key species for the aqueous speciation of uranium, even in reducing environment where U(IV) low solubility usually governs uranium mobility.
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Affiliation(s)
- Pascal E Reiller
- Den - Service D'Études Analytiques et de Réactivité des Surfaces (SEARS), CEA, Université Paris-Saclay, F-91191, Gif-sur-Yvette, France.
| | - Michaël Descostes
- ORANO Group Mining R&D Dpt, 125 Avenue de Paris, F-92320, Châtillon, France
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10
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Shang C, Reiller PE. Determination of formation constants and specific ion interaction coefficients for CanUO2(CO3)3(4−2n)− complexes in NaCl solution by time-resolved laser-induced luminescence spectroscopy. Dalton Trans 2020; 49:466-481. [DOI: 10.1039/c9dt03543e] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The formation constants of CaUO2(CO3)32− and Ca2UO2(CO3)3(aq) were determined in NaCl medium at ionic strengths between 0.1 and 1 mol kgw−1 using time-resolved laser-induced luminescence spectroscopy (TRLS).
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Affiliation(s)
- Chengming Shang
- Den – Service d’Études Analytiques et de Réactivité des Surfaces (SEARS)
- CEA
- Université Paris-Saclay
- F-91191 Gif-sur-Yvette CEDEX
- France
| | - Pascal E. Reiller
- Den – Service d’Études Analytiques et de Réactivité des Surfaces (SEARS)
- CEA
- Université Paris-Saclay
- F-91191 Gif-sur-Yvette CEDEX
- France
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11
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Jo Y, Kirishima A, Kimuro S, Kim HK, Yun JI. Formation of CaUO2(CO3)32− and Ca2UO2(CO3)3(aq) complexes at variable temperatures (10–70 °C). Dalton Trans 2019; 48:6942-6950. [DOI: 10.1039/c9dt01174a] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ternary complexation of calcium uranyl tricarbonate species, CaUO2(CO3)32− and Ca2UO2(CO3)3(aq), which are the predominant U(vi) complexes in groundwater and seawater, was investigated at variable temperatures from 10 to 70 °C.
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Affiliation(s)
- Yongheum Jo
- Department of Nuclear and Quantum Engineering
- Daejeon 34141
- Republic of Korea
| | - Akira Kirishima
- Institute of Multidisciplinary Research for Advanced Materials
- Tohoku University
- Sendai
- Japan
| | - Shingo Kimuro
- Institute of Multidisciplinary Research for Advanced Materials
- Tohoku University
- Sendai
- Japan
| | - Hee-Kyung Kim
- Nuclear Chemistry Research Division
- Korea Atomic Energy Research Institute
- Daejeon 34057
- Republic of Korea
| | - Jong-Il Yun
- Department of Nuclear and Quantum Engineering
- Daejeon 34141
- Republic of Korea
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Priest C, Li B, Jiang DE. Understanding the Binding of a Bifunctional Amidoximate-Carboxylate Ligand with Uranyl in Seawater. J Phys Chem B 2018; 122:12060-12066. [PMID: 30484640 DOI: 10.1021/acs.jpcb.8b08345] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Extracting uranium from seawater remains a formidable challenge because of its extremely low concentration of 3.3 ppb. State-of-the-art polymeric sorbents employ both amidoximate and carboxylate groups on the side chains to achieve optimal U uptake and selectivity, but little is known about the synergistic effect between the two functional groups in binding with uranyl. Herein, we simulated the binding of a model amidoximate-carboxylate bifunctional ligand with uranyl using a combination of theoretical methods. Gas-phase quantum-mechanical calculations showed a chelate binding of a η2 amidoximate and a monodentate carboxylate to uranyl. Ab initio molecular dynamics (MD) simulations in an explicit water solvation model confirmed the stability of the chelate mode. Classical MD and free-energy simulations in 0.5 M NaCl showed that the carboxylate group binds first to uranyl, leading to a loose intermediate state, and then, the amidoximate group binds, resulting in a more stable and tight chelate state. Binding of the second bifunctional ligand follows a similar process, and the two ligands prefer a trans configuration around the uranyl group. The simulated free energies indicate that the two bifunctional ligands bind with uranyl 55 kJ/mol stronger than the two ligands with only amidoximate groups. This work suggests an important synergy between amidoximate and carboxylate groups in binding uranyl.
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Affiliation(s)
- Chad Priest
- Department of Chemistry , University of California , Riverside , California 92521 , United States
| | - Bo Li
- Department of Chemistry , University of California , Riverside , California 92521 , United States
| | - De-En Jiang
- Department of Chemistry , University of California , Riverside , California 92521 , United States
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Hadjithoma S, Papanikolaou MG, Leontidis E, Kabanos TA, Keramidas AD. Bis(hydroxylamino)triazines: High Selectivity and Hydrolytic Stability of Hydroxylamine-Based Ligands for Uranyl Compared to Vanadium(V) and Iron(III). Inorg Chem 2018; 57:7631-7643. [DOI: 10.1021/acs.inorgchem.8b00582] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Sofia Hadjithoma
- Department of Chemistry, University of Cyprus, 2109 Nicosia, Cyprus
| | - Michael G. Papanikolaou
- Department of Chemistry, Section of Inorganic and Analytical Chemistry, University of Ioannina, 45110 Ioannina, Greece
| | | | - Themistoklis A. Kabanos
- Department of Chemistry, Section of Inorganic and Analytical Chemistry, University of Ioannina, 45110 Ioannina, Greece
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He M, Liu X, Cheng J, Lu X, Zhang C, Wang R. Uranyl Arsenate Complexes in Aqueous Solution: Insights from First-Principles Molecular Dynamics Simulations. Inorg Chem 2018; 57:5801-5809. [PMID: 29741893 DOI: 10.1021/acs.inorgchem.8b00136] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this study, the structures and acidity constants (p Ka's) of uranyl arsenate complexes in solutions have been revealed by using the first principle molecular dynamics technique. The results show that uranyl and arsenate form stable complexes with the U/As ratios of 1:1 and 1:2, and the bidentate complexation between U and As is highly favored. Speciation-pH distributions are derived based on free energy and p Ka calculations, which indicate that for the 1:1 species, UO2(H2AsO4)(H2O)3+ is the major species at pH < 7, while UO2(HAsO4)(H2O)30 and UO2(AsO4)(H2O)3- dominate in acid-to-alkaline and extreme alkaline pH ranges. For the 1:2 species, UO2(H2AsO4)2(H2O)0 is dominant under acid-to-neutral pH conditions, while UO2(HAsO4)(H2AsO4)(H2O)-, UO2(HAsO4)(HAsO4)(H2O)2-, and UO2(AsO4)(HAsO4)(H2O)3- become the major forms in the pH range of 7.2-10.7, 10.7-12.1, and >12.1, respectively.
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Affiliation(s)
- Mengjia He
- State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering , Nanjing University , Nanjing 210046 , P. R. China
| | - Xiandong Liu
- State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering , Nanjing University , Nanjing 210046 , P. R. China
| | - Jun Cheng
- State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering , Xiamen University , Xiamen 361005 , China.,Department of Chemistry , University of Aberdeen , Aberdeen AB24 3UE , United Kingdom
| | - Xiancai Lu
- State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering , Nanjing University , Nanjing 210046 , P. R. China
| | - Chi Zhang
- State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering , Nanjing University , Nanjing 210046 , P. R. China
| | - Rucheng Wang
- State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and Engineering , Nanjing University , Nanjing 210046 , P. R. China
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Li B, Priest C, Jiang DE. Displacement of carbonates in Ca2UO2(CO3)3 by amidoxime-based ligands from free-energy simulations. Dalton Trans 2018; 47:1604-1613. [DOI: 10.1039/c7dt03412a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Classical molecular dynamics simulations coupled with umbrella sampling reveal the atomistic processes and free-energy profiles of the displacement of carbonate groups in the Ca2UO2(CO3)3 complex by amidoxime-based ligands in a 0.5 M NaCl solution.
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Affiliation(s)
- Bo Li
- Department of Chemistry
- University of California
- Riverside
- USA
| | - Chad Priest
- Department of Chemistry
- University of California
- Riverside
- USA
| | - De-en Jiang
- Department of Chemistry
- University of California
- Riverside
- USA
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