1
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Li J, Liu X, Jonsson M. Exploring the Change in Redox Reactivity of UO 2 Induced by Exposure to Oxidants in HCO 3- Solution. Inorg Chem 2023; 62:7413-7423. [PMID: 37128775 DOI: 10.1021/acs.inorgchem.3c00682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Understanding the possible change in UO2 surface reactivity after exposure to oxidants is of key importance when assessing the impact of spent nuclear fuel dissolution on the safety of a repository for spent nuclear fuel. In this work, we have experimentally studied the change in UO2 reactivity after consecutive exposures to O2 or γ-radiation in aqueous solutions containing 10 mM HCO3-. The experiments show that the reactivity of UO2 toward O2 decreases significantly with time in a single exposure. In consecutive exposures, the reactivity also decreases from exposure to exposure. In γ-radiation exposures, the system reaches a steady state and the rate of uranium dissolution becomes governed by the radiolytic production of oxidants. Changes in surface reactivity can therefore not be observed in the irradiated system. The potential surface modification responsible for the change in UO2 reactivity was studied by XPS and UPS after consecutive exposures to either O2, H2O2, or γ-radiation in 10 mM HCO3- solution. The results show that the surfaces were significantly oxidized to a stoichiometric ratio of O/U of UO2.3 under all the three exposure conditions. XPS results also show that the surfaces were dominated by U(V) with no observed U(VI). The experiments also show that U(V) is slowly removed from the surface when exposed to anoxic aqueous solutions containing 10 mM HCO3-. The UPS results show that the outer ultrathin layer of the surfaces most probably contains a significant amount of U(VI). U(VI) may form upon exposure to air during the rinsing process with water prior to XPS and UPS measurements.
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Affiliation(s)
- Junyi Li
- Department of Chemistry, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal institute of Technology, SE-10044 Stockholm, Sweden
| | - Xianjie Liu
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, Norrköping, SE-60174, Sweden
| | - Mats Jonsson
- Department of Chemistry, School of Engineering Sciences in Chemistry, Biotechnology and Health, KTH Royal institute of Technology, SE-10044 Stockholm, Sweden
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2
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Yomogida T, Akiyama D, Ouchi K, Kumagai Y, Higashi K, Kitatsuji Y, Kirishima A, Kawamura N, Takahashi Y. Application of High-Energy-Resolution X-ray Absorption Spectroscopy at the U L 3-Edge to Assess the U(V) Electronic Structure in FeUO 4. Inorg Chem 2022; 61:20206-20210. [PMID: 36459052 PMCID: PMC9768738 DOI: 10.1021/acs.inorgchem.2c03208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
FeUO4 was studied to clarify the electronic structure of U(V) in a metal monouranate compound. We obtained the peak splitting of spectra utilizing high-energy-resolution fluorescence detection-X-ray absorption near-edge structure (HERFD-XANES) spectroscopy at the U L3-edge, which is a novel technique in uranium(V) monouranate compounds. Theoretical calculations revealed that the peak splitting was caused by splitting of the 6d orbital of U(V) in FeUO4, which would be used to detect minor U(V) species. Such distinctive electronic states are of major interest to researchers and engineers working in various fields, from fundamental physics to the nuclear industry and environmental sciences for actinide elements.
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Affiliation(s)
- Takumi Yomogida
- Department
of Earth and Planetary Science, The University
of Tokyo, Hongo 7-3-1, Bunkyo, Tokyo 113-0033, Japan,Nuclear
Science and Engineering Center, Japan Atomic
Energy Agency, Tokai-mura,
Naka-gun, Ibaraki 319-1195, Japan,
| | - Daisuke Akiyama
- Institute
of Multidisciplinary Research for Advanced Materials, Tohoku University, 1-1 Katahira 2, Aoba, Sendai, Miyagi 980-8577, Japan
| | - Kazuki Ouchi
- Nuclear
Science and Engineering Center, Japan Atomic
Energy Agency, Tokai-mura,
Naka-gun, Ibaraki 319-1195, Japan
| | - Yuta Kumagai
- Nuclear
Science and Engineering Center, Japan Atomic
Energy Agency, Tokai-mura,
Naka-gun, Ibaraki 319-1195, Japan
| | - Kotaro Higashi
- Center
for Synchrotron Radiation Research, Japan
Synchrotron Radiation Research Institute (JASRI), Sayo, Hyogo 679-5198, Japan
| | - Yoshihiro Kitatsuji
- Nuclear
Science and Engineering Center, Japan Atomic
Energy Agency, Tokai-mura,
Naka-gun, Ibaraki 319-1195, Japan
| | - Akira Kirishima
- Institute
of Multidisciplinary Research for Advanced Materials, Tohoku University, 1-1 Katahira 2, Aoba, Sendai, Miyagi 980-8577, Japan
| | - Naomi Kawamura
- Center
for Synchrotron Radiation Research, Japan
Synchrotron Radiation Research Institute (JASRI), Sayo, Hyogo 679-5198, Japan
| | - Yoshio Takahashi
- Department
of Earth and Planetary Science, The University
of Tokyo, Hongo 7-3-1, Bunkyo, Tokyo 113-0033, Japan,Isotope Science
Center, University of Tokyo, Bunkyo, Tokyo 113-0032, Japan,Photon
Factory, Institute of Materials Structure Science, High Energy Accelerator Research Organization, KEK, Tsukuba, Ibaraki 305-0801, Japan
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3
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Pan Z, Roebbert Y, Beck A, Bartova B, Vitova T, Weyer S, Bernier-Latmani R. Persistence of the Isotopic Signature of Pentavalent Uranium in Magnetite. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:1753-1762. [PMID: 35061941 PMCID: PMC8811959 DOI: 10.1021/acs.est.1c06865] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/11/2021] [Revised: 01/03/2022] [Accepted: 01/05/2022] [Indexed: 06/14/2023]
Abstract
Uranium isotopic signatures can be harnessed to monitor the reductive remediation of subsurface contamination or to reconstruct paleo-redox environments. However, the mechanistic underpinnings of the isotope fractionation associated with U reduction remain poorly understood. Here, we present a coprecipitation study, in which hexavalent U (U(VI)) was reduced during the synthesis of magnetite and pentavalent U (U(V)) was the dominant species. The measured δ238U values for unreduced U(VI) (∼-1.0‰), incorporated U (96 ± 2% U(V), ∼-0.1‰), and extracted surface U (mostly U(IV), ∼0.3‰) suggested the preferential accumulation of the heavy isotope in reduced species. Upon exposure of the U-magnetite coprecipitate to air, U(V) was partially reoxidized to U(VI) with no significant change in the δ238U value. In contrast, anoxic amendment of a heavy isotope-doped U(VI) solution resulted in an increase in the δ238U of the incorporated U species over time, suggesting an exchange between incorporated and surface/aqueous U. Overall, the results support the presence of persistent U(V) with a light isotope signature and suggest that the mineral dynamics of iron oxides may allow overprinting of the isotopic signature of incorporated U species. This work furthers the understanding of the isotope fractionation of U associated with iron oxides in both modern and paleo-environments.
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Affiliation(s)
- Zezhen Pan
- Department
of Environmental Science and Engineering, Cluster of Interfacial Processes
Against Pollution (CIPAP), Fudan University, Shanghai 200438, China
- Environmental
Microbiology Laboratory, École Polytechnique
Fédérale de Lausanne, Lausanne 1015, Switzerland
| | - Yvonne Roebbert
- Leibniz,
Universität Hannover, Institut für
Mineralogie, D-30167 Hannover, Germany
| | - Aaron Beck
- Institute
for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology, Karlsruhe 76021, Germany
| | - Barbora Bartova
- Environmental
Microbiology Laboratory, École Polytechnique
Fédérale de Lausanne, Lausanne 1015, Switzerland
| | - Tonya Vitova
- Institute
for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology, Karlsruhe 76021, Germany
| | - Stefan Weyer
- Leibniz,
Universität Hannover, Institut für
Mineralogie, D-30167 Hannover, Germany
| | - Rizlan Bernier-Latmani
- Environmental
Microbiology Laboratory, École Polytechnique
Fédérale de Lausanne, Lausanne 1015, Switzerland
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4
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Schacherl B, Prüssmann T, Dardenne K, Hardock K, Krepper V, Rothe J, Vitova T, Geckeis H. Implementation of cryogenic tender X-ray HR-XANES spectroscopy at the ACT station of the CAT-ACT beamline at the KIT Light Source. JOURNAL OF SYNCHROTRON RADIATION 2022; 29:80-88. [PMID: 34985425 PMCID: PMC8733978 DOI: 10.1107/s1600577521012650] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 11/28/2021] [Indexed: 06/07/2023]
Abstract
The ACT experimental station of the CAT-ACT wiggler beamline at the Karlsruhe Institute of Technology (KIT) Light Source is dedicated to the investigation of radionuclide materials with radioactivities up to 1000000 times the exemption limit by various speciation techniques applying monochromatic X-rays. In this article, the latest technological developments at the ACT station that enable high-resolution X-ray absorption near-edge structure (HR-XANES) spectroscopy for low radionuclide loading samples are highlighted - encompassing the investigation of actinide elements down to 1 p.p.m. concentration - combined with a cryogenic sample environment reducing beam-induced sample alterations. One important part of this development is a versatile gas tight plexiglass encasement ensuring that all beam paths in the five-analyzer-crystal Johann-type X-ray emission spectrometer run within He atmosphere. The setup enables the easy exchange between different experiments (conventional X-ray absorption fine structure, HR-XANES, high-energy or wide-angle X-ray scattering, tender to hard X-ray spectroscopy) and opens up the possibility for the investigation of environmental samples, such as specimens containing transuranium elements from contaminated land sites or samples from sorption and diffusion experiments to mimic the far field of a breached nuclear waste repository.
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Affiliation(s)
- Bianca Schacherl
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Tim Prüssmann
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Kathy Dardenne
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Kirsten Hardock
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Volker Krepper
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Jörg Rothe
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Tonya Vitova
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Horst Geckeis
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
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5
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Pruessmann T, Nagel P, Simonelli L, Batchelor D, Gordon R, Schimmelpfennig B, Trumm M, Vitova T. Opportunities and challenges of applying advanced X-ray spectroscopy to actinide and lanthanide N-donor ligand systems. JOURNAL OF SYNCHROTRON RADIATION 2022; 29:53-66. [PMID: 34985423 PMCID: PMC8733980 DOI: 10.1107/s1600577521012091] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 11/12/2021] [Indexed: 06/14/2023]
Abstract
N-donor ligands such as n-Pr-BTP [2,6-bis(5,6-dipropyl-1,2,4-triazin-3-yl)pyridine] preferentially bind trivalent actinides (An3+) over trivalent lanthanides (Ln3+) in liquid-liquid separation. However, the chemical and physical processes responsible for this selectivity are not yet well understood. Here, an explorative comparative X-ray spectroscopy and computational (L3-edge) study for the An/Ln L3-edge and the N K-edge of [An/Ln(n-Pr-BTP)3](NO3)3, [Ln(n-Pr-BTP)3](CF3SO3)3 and [Ln(n-Pr-BTP)3](ClO4)3 complexes is presented. High-resolution X-ray absorption near-edge structure (HR-XANES) L3-edge data reveal additional features in the pre- and post-edge range of the spectra that are investigated using the quantum chemical codes FEFF and FDMNES. X-ray Raman spectroscopy studies demonstrate the applicability of this novel technique for investigations of liquid samples of partitioning systems at the N K-edge.
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Affiliation(s)
- Tim Pruessmann
- Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Peter Nagel
- Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
| | - Laura Simonelli
- ALBA Synchrotron Light Facility, Cerdanyola del Vallès 08290, Spain
| | - David Batchelor
- Institute for Photon Science and Synchrotron Radiation, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Robert Gordon
- PNCSRF, APS Sector 20, Argonne, IL 60439, USA
- Moyie Institute, Burnaby, BC, Canada
| | - Bernd Schimmelpfennig
- Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Michael Trumm
- Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
| | - Tonya Vitova
- Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, 76344 Eggenstein-Leopoldshafen, Germany
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6
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Abstract
AbstractStudtite is known to exist at the back-end of the nuclear fuel cycle as an intermediate phase formed in the reprocessing of spent nuclear fuel. In the thermal decomposition of studtite, an amorphous phase is obtained at calcination temperatures between 200 and 500 °C. This amorphous compound, referred to elsewhere in the literature as U2O7, has been characterised by analytical spectroscopic methods. The local structure of the amorphous compound has been found to contain uranyl bonding by X-ray absorption near edge (XANES), Fourier transform infrared and Raman spectroscopy. Changes in bond distances in the uranyl group are discussed with respect to studtite calcination temperature. The reaction of the amorphous compound with water to form metaschoepite is also discussed and compared with the structure of schoepite and metaschoepite by X-ray diffraction. A novel schematic reaction mechanism for the thermal decomposition of studtite is proposed.
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7
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Platts JA, Baker RJ. A computational investigation of orbital overlap versus energy degeneracy covalency in [UE2]2+ (E = O, S, Se, Te) complexes. Dalton Trans 2020; 49:1077-1088. [DOI: 10.1039/c9dt04484a] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Covalency in analogues of uranyl with heavy chalcogens is explored using DFT, and traced to increased energy-degeneracy as the group is descended.
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Affiliation(s)
| | - Robert J. Baker
- School of Chemistry
- University of Dublin
- Trinity College
- Dublin 2
- Ireland
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8
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Vitova T, Pidchenko I, Schild D, Prüßmann T, Montoya V, Fellhauer D, Gaona X, Bohnert E, Rothe J, Baker RJ, Geckeis H. Competitive Reaction of Neptunium(V) and Uranium(VI) in Potassium–Sodium Carbonate-Rich Aqueous Media: Speciation Study with a Focus on High-Resolution X-ray Spectroscopy. Inorg Chem 2019; 59:8-22. [DOI: 10.1021/acs.inorgchem.9b02463] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tonya Vitova
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology, P.O. 3640, D-76021 Karlsruhe, Germany
| | - Ivan Pidchenko
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology, P.O. 3640, D-76021 Karlsruhe, Germany
| | - Dieter Schild
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology, P.O. 3640, D-76021 Karlsruhe, Germany
| | - Tim Prüßmann
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology, P.O. 3640, D-76021 Karlsruhe, Germany
| | - Vanessa Montoya
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology, P.O. 3640, D-76021 Karlsruhe, Germany
| | - David Fellhauer
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology, P.O. 3640, D-76021 Karlsruhe, Germany
| | - Xavier Gaona
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology, P.O. 3640, D-76021 Karlsruhe, Germany
| | - Elke Bohnert
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology, P.O. 3640, D-76021 Karlsruhe, Germany
| | | | - Robert J. Baker
- School of Chemistry, University of Dublin, Trinity College, Dublin 2, Ireland
| | - Horst Geckeis
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology, P.O. 3640, D-76021 Karlsruhe, Germany
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9
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Winstanley EH, Morris K, Abrahamsen-Mills LG, Blackham R, Shaw S. U(VI) sorption during ferrihydrite formation: Underpinning radioactive effluent treatment. JOURNAL OF HAZARDOUS MATERIALS 2019; 366:98-104. [PMID: 30502577 DOI: 10.1016/j.jhazmat.2018.11.077] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2018] [Revised: 10/06/2018] [Accepted: 11/19/2018] [Indexed: 05/22/2023]
Abstract
Iron (oxyhydr)oxide nanoparticles are known to sorb metals, including radionuclides, from solution in various environmental and industrial systems. Effluent treatment processes including the Enhanced Actinide Removal Plant (EARP) (Sellafield, UK) use a neutralisation process to induce the precipitation of iron (oxyhydr)oxides to remove radionuclides from solution. There is a paucity of information on mechanism(s) of U(VI) removal under conditions relevant to such industrial processes. Here, we investigated removal of U(VI) from simulated effluents containing 7.16 mM Fe(III) with 4.2 × 10-4-1.05 mM U(VI), during the base induced hydrolysis of Fe(III). The solid product was ferrihydrite under all conditions. Acid dissolutions, Fourier Transform infrared spectroscopy and thermodynamic modelling indicated that U(VI) was removed from solution by adsorption to the ferrihydrite. The sorption mechanism was supported by X-ray Absorption Spectroscopy which showed U(VI) was adsorbed to ferrihydrite via a bidentate edge-sharing inner-sphere species with carbonate forming a ternary surface complex. At concentrations ≤0.42 mM U(VI) was removed entirely via adsorption, however at 1.05 mM U(VI) there was also evidence for precipitation of a discrete U(VI) phase. Overall these results confirm that U(VI) sequestered via adsorption to ferrihydrite over a concentration range from 4.2 × 10-4-0.42 mM confirming a remarkably consistent removal mechanism in this industrially relevant system.
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Affiliation(s)
- Ellen H Winstanley
- Research Centre for Radwaste Disposal and Williamson Research Centre, School of Earth and Environmental Sciences, The University of Manchester, M13 9PL, UK
| | - Katherine Morris
- Research Centre for Radwaste Disposal and Williamson Research Centre, School of Earth and Environmental Sciences, The University of Manchester, M13 9PL, UK
| | | | - Richard Blackham
- Sellafield Ltd., Hinton House, Birchwood Park Avenue, Risley, Warrington, Cheshire, WA3 6GR, UK
| | - Samuel Shaw
- Research Centre for Radwaste Disposal and Williamson Research Centre, School of Earth and Environmental Sciences, The University of Manchester, M13 9PL, UK.
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10
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Fifteen Years of Radionuclide Research at the KIT Synchrotron Source in the Context of the Nuclear Waste Disposal Safety Case. GEOSCIENCES 2019. [DOI: 10.3390/geosciences9020091] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
For more than 120 years, systematic studies of X-ray interaction with matter have been the basis for our understanding of materials—both of natural or man-made origin—and their structure-function relationships. Beginning with simple radiographic imaging at the end of the 19th century, X-ray based analytical tools such as X-ray diffraction, X-ray fluorescence and photoemission or X-ray absorption techniques are indispensable in almost any field of chemical and material sciences—including basic and applied actinide and radionuclide studies. The advent of dedicated synchrotron radiation (SR) sources in the second half of the last century has revolutionized the analytical power of X-ray probes, while—with increasing number of SR facilities—beamline instrumentation followed a trend towards increasing specialization and adaption to a major research topic. The INE-Beamline and ACT station at the KIT synchrotron source belong to the exclusive club of a few synchrotron beamline facilities—mostly located in Europe—dedicated to the investigation of highly radioactive materials. Since commissioning of the INE-Beamline in 2005, capabilities for synchrotron-based radionuclide and actinide sciences at KIT have been continuously expanded, driven by in-house research programs and external user needs.
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11
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Vitova T, Pidchenko I, Biswas S, Beridze G, Dunne PW, Schild D, Wang Z, Kowalski PM, Baker RJ. Dehydration of the Uranyl Peroxide Studtite, [UO2(η2-O2)(H2O)2]·2H2O, Affords a Drastic Change in the Electronic Structure: A Combined X-ray Spectroscopic and Theoretical Analysis. Inorg Chem 2018; 57:1735-1743. [DOI: 10.1021/acs.inorgchem.7b02326] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tonya Vitova
- Institute for Nuclear Waste Disposal (INE), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Ivan Pidchenko
- Institute for Nuclear Waste Disposal (INE), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Saptarshi Biswas
- School
of Chemistry, University of Dublin, Trinity College, College Green, Dublin 2, Ireland
| | - George Beridze
- Institute of Energy and Climate Research,
IEK-6, Nuclear Waste Management and Reactor Safety, Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Strasse, 52428 Jülich, Germany
- JARA High-Performance Computing, Schinkelstrasse 2, 52062 Aachen, Germany
| | - Peter W. Dunne
- School
of Chemistry, University of Dublin, Trinity College, College Green, Dublin 2, Ireland
| | - Dieter Schild
- Institute for Nuclear Waste Disposal (INE), Hermann-von-Helmholtz-Platz 1, D-76344 Eggenstein-Leopoldshafen, Germany
| | - Zheming Wang
- Pacific Northwest National Laboratory, MSIN K8-96, P.O. Box 999, Richland, Washington 99352, United States
| | - Piotr M. Kowalski
- Institute of Energy and Climate Research,
IEK-6, Nuclear Waste Management and Reactor Safety, Forschungszentrum Jülich GmbH, Wilhelm-Johnen-Strasse, 52428 Jülich, Germany
- JARA High-Performance Computing, Schinkelstrasse 2, 52062 Aachen, Germany
| | - Robert J. Baker
- School
of Chemistry, University of Dublin, Trinity College, College Green, Dublin 2, Ireland
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12
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Bahl S, Peuget S, Pidchenko I, Pruessmann T, Rothe J, Dardenne K, Delrieu J, Fellhauer D, Jégou C, Geckeis H, Vitova T. Pu Coexists in Three Oxidation States in a Borosilicate Glass: Implications for Pu Solubility. Inorg Chem 2017; 56:13982-13990. [PMID: 29087699 DOI: 10.1021/acs.inorgchem.7b02118] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Pu(III), Pu(IV), and a higher oxidation state of Pu, likely Pu(VI), are for the first time characterized simultaneously present in a borosilicate glass using Pu M5 edge high energy resolution X-ray absorption near edge structure (HR-XANES) technique. We illustrate that the method can be very efficiently used to determine Pu oxidation states, which control the solubility limit of Pu in a glass matrix. HR-XANES results show that the addition of excess Si3N4 is not sufficient for complete reduction of Pu to Pu(III), which has a relatively high solubility limit (9-22 wt % Pu) due to its network-modifying behavior in glasses. We provide evidence that the initially added Pu(VI) might be partly preserved during vitrification at 1200/1400 °C in Ar atmosphere. Pu(VI) could be very advantageous for vitrification of Pu-rich wastes, since it might reach solubility limits of 40 wt % comparable to U(VI).
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Affiliation(s)
- Sebastian Bahl
- Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology , P.O. Box 3640, 76021 Karlsruhe, Germany
| | - Sylvain Peuget
- Institut de Chimie Séparative de Marcoule, CEA Valrhô Marcoule, UMR 5257 , BP 17171, 30207 Bagnols-sur-Cèze, France
| | - Ivan Pidchenko
- Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology , P.O. Box 3640, 76021 Karlsruhe, Germany
| | - Tim Pruessmann
- Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology , P.O. Box 3640, 76021 Karlsruhe, Germany
| | - Jörg Rothe
- Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology , P.O. Box 3640, 76021 Karlsruhe, Germany
| | - Kathy Dardenne
- Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology , P.O. Box 3640, 76021 Karlsruhe, Germany
| | - Julien Delrieu
- Institut de Chimie Séparative de Marcoule, CEA Valrhô Marcoule, UMR 5257 , BP 17171, 30207 Bagnols-sur-Cèze, France
| | - David Fellhauer
- Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology , P.O. Box 3640, 76021 Karlsruhe, Germany
| | - Christophe Jégou
- Institut de Chimie Séparative de Marcoule, CEA Valrhô Marcoule, UMR 5257 , BP 17171, 30207 Bagnols-sur-Cèze, France
| | - Horst Geckeis
- Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology , P.O. Box 3640, 76021 Karlsruhe, Germany
| | - Tonya Vitova
- Institute for Nuclear Waste Disposal, Karlsruhe Institute of Technology , P.O. Box 3640, 76021 Karlsruhe, Germany
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13
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Vitova T, Pidchenko I, Fellhauer D, Bagus PS, Joly Y, Pruessmann T, Bahl S, Gonzalez-Robles E, Rothe J, Altmaier M, Denecke MA, Geckeis H. The role of the 5f valence orbitals of early actinides in chemical bonding. Nat Commun 2017; 8:16053. [PMID: 28681848 PMCID: PMC5504295 DOI: 10.1038/ncomms16053] [Citation(s) in RCA: 116] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Accepted: 05/24/2017] [Indexed: 12/22/2022] Open
Abstract
One of the long standing debates in actinide chemistry is the level of localization and participation of the actinide 5f valence orbitals in covalent bonds across the actinide series. Here we illuminate the role of the 5f valence orbitals of uranium, neptunium and plutonium in chemical bonding using advanced spectroscopies: actinide M4,5 HR-XANES and 3d4f RIXS. Results reveal that the 5f orbitals are active in the chemical bonding for uranium and neptunium, shown by significant variations in the level of their localization evidenced in the spectra. In contrast, the 5f orbitals of plutonium appear localized and surprisingly insensitive to different bonding environments. We envisage that this report of using relative energy differences between the 5fδ/φ and 5fπ*/5fσ* orbitals as a qualitative measure of overlap-driven actinyl bond covalency will spark activity, and extend to numerous applications of RIXS and HR-XANES to gain new insights into the electronic structures of the actinide elements.
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Affiliation(s)
- T. Vitova
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. 3640, D-76021 Karlsruhe, Germany
| | - I. Pidchenko
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. 3640, D-76021 Karlsruhe, Germany
| | - D. Fellhauer
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. 3640, D-76021 Karlsruhe, Germany
| | - P. S. Bagus
- Department of Chemistry, University of North Texas, Denton, Texas 76203-5017, USA
| | - Y. Joly
- University Grenoble Alpes, Inst NEEL, F-38042 Grenoble, France
- CNRS, Inst NEEL, F-38042 Grenoble, France
| | - T. Pruessmann
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. 3640, D-76021 Karlsruhe, Germany
| | - S. Bahl
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. 3640, D-76021 Karlsruhe, Germany
| | - E. Gonzalez-Robles
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. 3640, D-76021 Karlsruhe, Germany
| | - J. Rothe
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. 3640, D-76021 Karlsruhe, Germany
| | - M. Altmaier
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. 3640, D-76021 Karlsruhe, Germany
| | - M. A. Denecke
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. 3640, D-76021 Karlsruhe, Germany
| | - H. Geckeis
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. 3640, D-76021 Karlsruhe, Germany
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14
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Grabias E, Majdan M. A DFT study of uranyl hydroxyl complexes: structure and stability of trimers and tetramers. J Radioanal Nucl Chem 2017; 313:455-465. [PMID: 28804187 PMCID: PMC5533873 DOI: 10.1007/s10967-017-5305-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Indexed: 11/28/2022]
Abstract
A DFT study of U(VI) hydroxy complexes was performed with special attention paid to the [(UO2)3(OH)5(H2O)4–7]+ and [(UO2)4(OH)7(H2O)5–8]+ species. It was established that the ionicity of the U=O bond increased when moving from [(UO2)(H2O)5]2+, [(UO2)2(OH)(H2O)8]3+, [(UO2)2(OH)2(H2O)6]2+, [(UO2)3(OH)5(H2O)4–6]+ to [(UO2)4(OH)7(H2O)5–8]+ species. In both [(UO2)3(OH)5(H2O)4–6]+ and [(UO2)4(OH)7(H2O)5–8]+ complexes, the U=O bond was observed to have a range of different lengths which depended on the composition of the first coordination sphere of UO22+. The cyclic structures of trimeric complexes were somewhat more stable than their linear structures, which was probably due to the steric effect.
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Affiliation(s)
- Ewelina Grabias
- Institute of Mathematics, Maria Curie Skłodowska University, pl. Marii Curie Skłodowskiej 1, 20-031 Lublin, Poland
| | - Marek Majdan
- Faculty of Chemistry, Maria Curie Skłodowska University, pl. Marii Curie Skłodowskiej 2, 20-031 Lublin, Poland
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15
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Colmenero F, Bonales LJ, Cobos J, Timón V. Study of the thermal stability of studtite by in situ Raman spectroscopy and DFT calculations. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2017; 174:245-253. [PMID: 27923211 DOI: 10.1016/j.saa.2016.11.040] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2016] [Revised: 11/16/2016] [Accepted: 11/24/2016] [Indexed: 06/06/2023]
Abstract
The design of a safe spent nuclear fuel repository requires the knowledge of the stability of the secondary phases which precipitate when water reaches the fuel surface. Studtite is recognized as one of the secondary phases that play a key-role in the mobilization of the radionuclides contained in the spent fuel. Thereby, it has been identified as a product formed under oxidation conditions at the surface of the fuel, and recently found as a corrosion product in the Fukushima-Daiichi nuclear plant accident. Thermal stability is one of the properties that should be determined due to the high temperature of the fuel. In this work we report a detailed analysis of the structure and thermal stability of studtite. The structure has been studied both by experimental techniques (SEM, TGA, XRD and Raman spectroscopy) and theoretical DFT electronic structure and spectroscopic calculations. The comparison of the results allows us to perform for the first time the Raman bands assignment of the whole spectrum. The thermal stability of studtite has been analyzed by in situ Raman spectroscopy, with the aim of studying the effect of the heating rate and the presence of water. For this purpose, a new cell has been designed. The results show that studtite is stable under dry conditions only at temperatures below 30°C, in contrast with the higher temperatures published up to date (~130°C). Opposite behaviour has been found when studtite is in contact with water; under these conditions studtite is stable up to 90°C, what is consistent with the encounter of this phase after the Fukushima-Daiichi accident.
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Affiliation(s)
- Francisco Colmenero
- Instituto de Estructura de la Materia, CSIC. C/Serrano, 113, 28006 Madrid, Spain.
| | - Laura J Bonales
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT. Avda/Complutense, 40, 28040 Madrid, Spain
| | - Joaquín Cobos
- Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, CIEMAT. Avda/Complutense, 40, 28040 Madrid, Spain
| | - Vicente Timón
- Instituto de Estructura de la Materia, CSIC. C/Serrano, 113, 28006 Madrid, Spain
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16
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Pidchenko I, Kvashnina KO, Yokosawa T, Finck N, Bahl S, Schild D, Polly R, Bohnert E, Rossberg A, Göttlicher J, Dardenne K, Rothe J, Schäfer T, Geckeis H, Vitova T. Uranium Redox Transformations after U(VI) Coprecipitation with Magnetite Nanoparticles. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:2217-2225. [PMID: 28094921 DOI: 10.1021/acs.est.6b04035] [Citation(s) in RCA: 75] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Uranium redox states and speciation in magnetite nanoparticles coprecipitated with U(VI) for uranium loadings varying from 1000 to 10 000 ppm are investigated by X-ray absorption spectroscopy (XAS). It is demonstrated that the U M4 high energy resolution X-ray absorption near edge structure (HR-XANES) method is capable to clearly characterize U(IV), U(V), and U(VI) existing simultaneously in the same sample. The contributions of the three different uranium redox states are quantified with the iterative transformation factor analysis (ITFA) method. U L3 XAS and transmission electron microscopy (TEM) reveal that initially sorbed U(VI) species recrystallize to nonstoichiometric UO2+x nanoparticles within 147 days when stored under anoxic conditions. These U(IV) species oxidize again when exposed to air. U M4 HR-XANES data demonstrate strong contribution of U(V) at day 10 and that U(V) remains stable over 142 days under ambient conditions as shown for magnetite nanoparticles containing 1000 ppm U. U L3 XAS indicates that this U(V) species is protected from oxidation likely incorporated into octahedral magnetite sites. XAS results are supported by density functional theory (DFT) calculations. Further characterization of the samples include powder X-ray diffraction (pXRD), scanning electron microscopy (SEM) and Fe 2p X-ray photoelectron spectroscopy (XPS).
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Affiliation(s)
- Ivan Pidchenko
- Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal (INE) , P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Kristina O Kvashnina
- European Synchrotron Radiation Facility (ESRF) , CS40220, 38043 Grenoble Cedex 9, France
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology , P.O. Box 510119, D-01314 Dresden, Germany
| | - Tadahiro Yokosawa
- Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal (INE) , P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Nicolas Finck
- Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal (INE) , P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Sebastian Bahl
- Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal (INE) , P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Dieter Schild
- Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal (INE) , P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Robert Polly
- Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal (INE) , P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Elke Bohnert
- Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal (INE) , P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - André Rossberg
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology , P.O. Box 510119, D-01314 Dresden, Germany
| | - Jörg Göttlicher
- Karlsruhe Institute of Technology, Institute for Photon Science and Synchrotron Radiation (IPS) , P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Kathy Dardenne
- Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal (INE) , P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Jörg Rothe
- Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal (INE) , P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Thorsten Schäfer
- Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal (INE) , P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Horst Geckeis
- Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal (INE) , P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Tonya Vitova
- Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal (INE) , P.O. Box 3640, D-76021 Karlsruhe, Germany
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17
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Zhang L, Zhou J, Zhang J, Su J, Zhang S, Chen N, Jia Y, Li J, Wang Y, Wang JQ. Extraction of local coordination structure in a low-concentration uranyl system by XANES. JOURNAL OF SYNCHROTRON RADIATION 2016; 23:758-768. [PMID: 27140156 DOI: 10.1107/s1600577516001910] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Accepted: 02/01/2016] [Indexed: 06/05/2023]
Abstract
Obtaining structural information of uranyl species at an atomic/molecular scale is a critical step to control and predict their physical and chemical properties. To obtain such information, experimental and theoretical L3-edge X-ray absorption near-edge structure (XANES) spectra of uranium were studied systematically for uranyl complexes. It was demonstrated that the bond lengths (R) in the uranyl species and relative energy positions (ΔE) of the XANES were determined as follows: ΔE1 = 168.3/R(U-Oax)(2) - 38.5 (for the axial plane) and ΔE2 = 428.4/R(U-Oeq)(2) - 37.1 (for the equatorial plane). These formulae could be used to directly extract the distances between the uranium absorber and oxygen ligand atoms in the axial and equatorial planes of uranyl ions based on the U L3-edge XANES experimental data. In addition, the relative weights were estimated for each configuration derived from the water molecule and nitrate ligand based on the obtained average equatorial coordination bond lengths in a series of uranyl nitrate complexes with progressively varied nitrate concentrations. Results obtained from XANES analysis were identical to that from extended X-ray absorption fine-structure (EXAFS) analysis. XANES analysis is applicable to ubiquitous uranyl-ligand complexes, such as the uranyl-carbonate complex. Most importantly, the XANES research method could be extended to low-concentration uranyl systems, as indicated by the results of the uranyl-amidoximate complex (∼40 p.p.m. uranium). Quantitative XANES analysis, a reliable and straightforward method, provides a simplified approach applied to the structural chemistry of actinides.
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Affiliation(s)
- Linjuan Zhang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China
| | - Jing Zhou
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China
| | - Jianyong Zhang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China
| | - Jing Su
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China
| | - Shuo Zhang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China
| | - Ning Chen
- Canadian Light Source, Saskatoon, Saskatchewan, Canada S7N 2V3
| | - Yunpeng Jia
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China
| | - Jiong Li
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China
| | - Yu Wang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China
| | - Jian Qiang Wang
- Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China
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18
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van Veelen A, Bargar JR, Law GTW, Brown GE, Wogelius RA. Uranium Immobilization and Nanofilm Formation on Magnesium-Rich Minerals. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:3435-3443. [PMID: 26990311 DOI: 10.1021/acs.est.5b06041] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Polarization-dependent grazing incidence X-ray absorption spectroscopy (XAS) measurements were completed on oriented single crystals of magnesite [MgCO3] and brucite [Mg(OH)2] reacted with aqueous uranyl chloride above and below the solubility boundaries of schoepite (500, 50, and 5 ppm) at pH 8.3 and at ambient (PCO2 = 10(-3.5)) or reduced partial pressures of carbon dioxide (PCO2 = 10(-4.5)). X-ray absorption near edge structure (XANES) spectra show a striking polarization dependence (χ = 0° and 90° relative to the polarization plane of the incident beam) and consistently demonstrated that the uranyl molecule was preferentially oriented with its Oaxial═U(VI)═Oaxial linkage at high angles (60-80°) to both magnesite (101̅4) and brucite (0001). Extended X-ray absorption fine structure (EXAFS) analysis shows that the "effective" number of U(VI) axial oxygens is the most strongly affected fitting parameter as a function of polarization. Furthermore, axial tilt in the surface thin films (thickness ∼ 21 Å) is correlated with surface roughness [σ]. Our results show that hydrated uranyl(-carbonate) complexes polymerize on all of our experimental surfaces and that this process is controlled by surface hydroxylation. These results provide new insights into the bonding configuration expected for uranyl complexes on the environmentally significant carbonate and hydroxide mineral surfaces.
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Affiliation(s)
| | - John R Bargar
- Department of Photon Science and Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory , 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | | | - Gordon E Brown
- Department of Photon Science and Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory , 2575 Sand Hill Road, Menlo Park, California 94025, United States
- Surface and Aqueous Geochemistry Group, Department of Geological Sciences, School of Earth, Energy, and Environmental Sciences, Stanford University , Stanford, California 94305-2115, United States
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19
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Payne DT, Fossey JS, Elmes RBP. Catalysis and Sensing for our Environment (CASE2015) and the Supramolecular Chemistry Ireland Meeting (SCI 2015): Dublin and Maynooth, Ireland. 8th–11th July. Supramol Chem 2016. [DOI: 10.1080/10610278.2016.1150595] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Daniel T. Payne
- School of Chemistry, University of Birmingham, Birmingham, UK
| | - John S. Fossey
- School of Chemistry, University of Birmingham, Birmingham, UK
| | - Robert B. P. Elmes
- Department of Chemistry, Maynooth University, National University of Ireland, Maynooth, Ireland
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20
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South C, Shee A, Mukherjee D, Wilson AK, Saue T. 4-Component relativistic calculations of L3ionization and excitations for the isoelectronic species UO22+, OUN+and UN2. Phys Chem Chem Phys 2016; 18:21010-23. [DOI: 10.1039/c6cp00262e] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
4-Component relativistic calculations explore uranium 2p3/2ionization and excitation in the isoelectronic series UO22+, OUN+and UN2.
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Affiliation(s)
- Christopher South
- Department of Chemistry and Center for Advanced Scientific Computation and Modeling (CASCaM)
- University of North Texas
- Denton
- USA
| | - Avijit Shee
- Laboratoire de Chimie et Physique Quantiques
- UMR 5626 CNRS – Université Toulouse III-Paul Sabatier
- F-31062 Toulouse
- France
| | - Debashis Mukherjee
- Raman Center for Atomic
- Molecular and Optical Sciences
- Indian Association for the Cultivation of Science
- Kolkata 700 032
- India
| | - Angela K. Wilson
- Department of Chemistry and Center for Advanced Scientific Computation and Modeling (CASCaM)
- University of North Texas
- Denton
- USA
- Department of Chemistry
| | - Trond Saue
- Laboratoire de Chimie et Physique Quantiques
- UMR 5626 CNRS – Université Toulouse III-Paul Sabatier
- F-31062 Toulouse
- France
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21
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Manceau A, Lemouchi C, Rovezzi M, Lanson M, Glatzel P, Nagy KL, Gautier-Luneau I, Joly Y, Enescu M. Structure, Bonding, and Stability of Mercury Complexes with Thiolate and Thioether Ligands from High-Resolution XANES Spectroscopy and First-Principles Calculations. Inorg Chem 2015; 54:11776-91. [DOI: 10.1021/acs.inorgchem.5b01932] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | | | - Mauro Rovezzi
- European Synchrotron Radiation Facility (ESRF), 71 Rue des Martyrs, 38000 Grenoble, France
| | | | - Pieter Glatzel
- European Synchrotron Radiation Facility (ESRF), 71 Rue des Martyrs, 38000 Grenoble, France
| | - Kathryn L. Nagy
- Department of Earth and Environmental Sciences, University of Illinois at Chicago, MC-186, 845 West Taylor Street, Chicago, Illinois 60607, United States
| | | | | | - Mironel Enescu
- Laboratoire
Chrono Environnement, Université de Franche-Comté, CNRS, 25030 Besançon, France
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22
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Qiu J, Vlaisavljevich B, Jouffret L, Nguyen K, Szymanowski JE, Gagliardi L, Burns PC. Cation Templating and Electronic Structure Effects in Uranyl Cage Clusters Probed by the Isolation of Peroxide-Bridged Uranyl Dimers. Inorg Chem 2015; 54:4445-55. [PMID: 25868048 DOI: 10.1021/acs.inorgchem.5b00248] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Bess Vlaisavljevich
- Department
of Chemistry, Supercomputing Institute, and Chemical Theory Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
| | | | | | | | - Laura Gagliardi
- Department
of Chemistry, Supercomputing Institute, and Chemical Theory Center, University of Minnesota, Minneapolis, Minnesota 55455, United States
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23
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Vitova T, Green JC, Denning RG, Löble M, Kvashnina K, Kas JJ, Jorissen K, Rehr JJ, Malcherek T, Denecke MA. Polarization dependent high energy resolution X-ray absorption study of dicesium uranyl tetrachloride. Inorg Chem 2014; 54:174-82. [PMID: 25485552 DOI: 10.1021/ic5020016] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Dicesium uranyl tetrachloride (Cs2UO2Cl4) has been a model compound for experimental and theoretical studies of electronic structure of U(VI) in the form of UO2(2+) (uranyl ion) for decades. We have obtained angle-resolved electronic structure information for oriented Cs2UO2Cl4 crystal, specifically relative energies of 5f and 6d valence orbitals probed with extraordinary energy resolution by polarization dependent high energy resolution X-ray absorption near edge structure (PD-HR-XANES) and compare these with predictions from quantum chemical Amsterdam density functional theory (ADF) and ab initio real space multiple-scattering Green's function based FEFF codes. The obtained results have fundamental value but also demonstrate an experimental approach, which offers great potential to benchmark and drive improvement in theoretical calculations of electronic structures of actinide elements.
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Affiliation(s)
- Tonya Vitova
- Karlsruhe Institute of Technology , Institute for Nuclear Waste Disposal, P.O. Box 3640, 76021 Karlsruhe, Germany
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