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Yu Y, Hao Y, Xiao B, Langer E, Novikov SA, Ramanantoanina H, Pidchenko I, Schild D, Albrecht-Schoenzart TE, Eichel RA, Vitova T, Alekseev EV. U(V) Stabilization via Aliovalent Incorporation of Ln(III) into Oxo-salt Framework. Chemistry 2024; 30:e202401033. [PMID: 38775406 DOI: 10.1002/chem.202401033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2024] [Indexed: 06/29/2024]
Abstract
Pentavalent uranium compounds are key components of uranium's redox chemistry and play important roles in environmental transport. Despite this, well-characterized U(V) compounds are scarce primarily because of their instability with respect to disproportionation to U(IV) and U(VI). In this work, we provide an alternate route to incorporation of U(V) into a crystalline lattice where different oxidation states of uranium can be stabilized through the incorporation of secondary cations with different sizes and charges. We show that iriginite-based crystalline layers allow for systematically replacing U(VI) with U(V) through aliovalent substitution of 2+ alkaline-earth or 3+ rare-earth cations as dopant ions under high-temperature conditions, specifically Ca(UVIO2)W4O14 and Ln(UVO2)W4O14 (Ln=Nd, Sm, Eu, Gd, Yb). Evidence for the existence of U(V) and U(VI) is supported by single-crystal X-ray diffraction, high energy resolution X-ray absorption near edge structure, X-ray photoelectron spectroscopy, and optical absorption spectroscopy. In contrast with other reported U(V) materials, the U(V) single crystals obtained using this route are relatively large (several centimeters) and easily reproducible, and thus provide a substantial improvement in the facile synthesis and stabilization of U(V).
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Affiliation(s)
- Yi Yu
- School of Physics and Electronics information, Gannan Normal University, Ganzhou, 341000, PR China
| | - Yucheng Hao
- School of Energy Materials and Chemical Engineering, Hefei University, Hefei, 230000, PR China
| | - Bin Xiao
- Institute of Energy and Climate Research (IEK-6), Forschungszentrum Jülich, D-52428, Jülich, Germany
| | - Eike Langer
- Institute of Energy and Climate Research (IEK-6), Forschungszentrum Jülich, D-52428, Jülich, Germany
| | - Sergei A Novikov
- Department of Chemistry, University of Georgia, 302 East Campus Road, Athens, GA 30602, USA
| | - Harry Ramanantoanina
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology, D-76125, Karlsruhe, Germany g
| | - Ivan Pidchenko
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology, D-76125, Karlsruhe, Germany g
| | - Dieter Schild
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology, D-76125, Karlsruhe, Germany g
| | - Thomas E Albrecht-Schoenzart
- Department of Chemistry and Nuclear Science and Engineering Center, Colorado School of Mines, Golden, Colorado, 80401, USA
| | - Rüdiger-A Eichel
- Institute of Energy and Climate Research (IEK-9), Forschungszentrum Jülich, D-52428, Jülich, Germany
| | - Tonya Vitova
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology, D-76125, Karlsruhe, Germany g
| | - Evgeny V Alekseev
- Institute of Energy and Climate Research (IEK-9), Forschungszentrum Jülich, D-52428, Jülich, Germany
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2
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Lu C, Xiu W, Yang B, Zhang H, Lian G, Zhang T, Bi E, Guo H. Natural Attenuation of Groundwater Uranium in Post-Neutral-Mining Sites Evidenced from Multiple Isotopes and Dissolved Organic Matter. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:12674-12684. [PMID: 38965983 DOI: 10.1021/acs.est.4c04498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/06/2024]
Abstract
Although natural attenuation is an economic remediation strategy for uranium (U) contamination, the role of organic molecules in driving U natural attenuation in postmining aquifers is not well-understood. Groundwaters were sampled to investigate the chemical, isotopic, and dissolved organic matter (DOM) compositions and their relationships to U natural attenuation from production wells and postmining wells in a typical U deposit (the Qianjiadian U deposit) mined by neutral in situ leaching. Results showed that Fe(II) concentrations and δ34SSO4 and δ18OSO4 values increased, but U concentrations decreased significantly from production wells to postmining wells, indicating that Fe(III) reduction and sulfate reduction were the predominant processes contributing to U natural attenuation. Microbial humic-like and protein-like components mediated the reduction of Fe(III) and sulfate, respectively. Organic molecules with H/C > 1.5 were conducive to microbe-mediated reduction of Fe(III) and sulfate and facilitated the natural attenuation of dissolved U. The average U attenuation rate was -1.07 mg/L/yr, with which the U-contaminated groundwater would be naturally attenuated in approximately 11.2 years. The study highlights the specific organic molecules regulating the natural attenuation of groundwater U via the reduction of Fe(III) and sulfate.
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Affiliation(s)
- Chongsheng Lu
- State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences Beijing, Beijing 100083, China
- MOE Key Laboratory of Groundwater Circulation and Environment Evolution, School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China
| | - Wei Xiu
- State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences Beijing, Beijing 100083, China
- MOE Key Laboratory of Groundwater Circulation and Environment Evolution, School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China
- Institute of Earth Sciences, China University of Geosciences (Beijing), Beijing 100083, China
| | - Bing Yang
- The Fourth Research and Design Engineering Corporation of CNNC, Shijiazhuang 050021, China
| | - Haoyan Zhang
- The Fourth Research and Design Engineering Corporation of CNNC, Shijiazhuang 050021, China
| | - Guoxi Lian
- The Fourth Research and Design Engineering Corporation of CNNC, Shijiazhuang 050021, China
| | - Tianjing Zhang
- State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences Beijing, Beijing 100083, China
- Institute of Earth Sciences, China University of Geosciences (Beijing), Beijing 100083, China
| | - Erping Bi
- MOE Key Laboratory of Groundwater Circulation and Environment Evolution, School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China
| | - Huaming Guo
- State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences Beijing, Beijing 100083, China
- MOE Key Laboratory of Groundwater Circulation and Environment Evolution, School of Water Resources and Environment, China University of Geosciences (Beijing), Beijing 100083, China
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3
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Wei X, Shi X, Yang M, Tan Q, Xu Z, Ma B, Pan D, Wu W. Phosphate and illite colloid pose a synergistic risk of enhanced uranium transport in groundwater: A challenge for phosphate immobilization remediation of uranium contaminated environmental water. WATER RESEARCH 2024; 255:121514. [PMID: 38554633 DOI: 10.1016/j.watres.2024.121514] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2024] [Revised: 03/13/2024] [Accepted: 03/23/2024] [Indexed: 04/02/2024]
Abstract
The phosphorus-containing reagents have been proposed to remediate the uranium contaminated sites due to the formation of insoluble uranyl phosphate mineralization products. However, the colloids, including both pseudo and intrinsic uranium colloids, could disturb the environmental fate of uranium due to its nonnegligible mobility. In this work, the transport pattern and micro-mechanism of uranium coupled to phosphate and illite colloid (IC) were investigated by combining column experiments and micro-spectroscopic evidences. Results showed that uranium transport was facilitated in granular media by forming the intrinsic uranyl phosphate colloid (such as Na-autunite) when the pH > 3.5 and CNa+ < 10 mM. Meanwhile, the mobility of uranium depended greatly on the typical water chemistry parameters governing the aggregation and deposit of intrinsic uranium colloids. However, the attachment of phosphate on illite granule increased the repulsive force and enhanced the dispersion stability of IC in the IC-U(VI)-phosphate ternary system. The non-preequilibrium transport and retention profiles, HRTEM-mapping, as well as TRLFS spectra revealed that the IC enhanced uranium mobility by forming the ternary IC-uranyl phosphate hybrid, and acted as the coagulation preventing agent for uranyl phosphate particles. This observed facilitation of uranium transport resulted from the formation of intrinsic uranyl phosphate colloids and IC-uranyl phosphate hybrids should be taken into consideration when evaluating the potential risk of uranium migration and optimizing the in-situ mineralization remediation strategy for uranium contaminated environmental water.
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Affiliation(s)
- Xiaoyan Wei
- MOE Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou 730000, China; Laboratory for Waste Management, Paul Scherrer Institut (PSI), CH-5232 Villigen PSI, Switzerland
| | - Xinyi Shi
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Meilin Yang
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Qi Tan
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Zhen Xu
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Bin Ma
- Laboratory for Waste Management, Paul Scherrer Institut (PSI), CH-5232 Villigen PSI, Switzerland; College of Environmental Science and Engineering, North China Electric Power University, Beijing 102206, China
| | - Duoqiang Pan
- MOE Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou 730000, China; School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China.
| | - Wangsuo Wu
- MOE Frontiers Science Center for Rare Isotopes, Lanzhou University, Lanzhou 730000, China; School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
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4
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Ri C, Kim M, Mun H, Liu L, Tang J. Unveiling the effect of different dissolved organic matter (DOM) on catalytic dechlorination of nFe/Ni particles: Corrosion and passivation effect. JOURNAL OF HAZARDOUS MATERIALS 2024; 469:133901. [PMID: 38430602 DOI: 10.1016/j.jhazmat.2024.133901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2023] [Revised: 01/30/2024] [Accepted: 02/25/2024] [Indexed: 03/05/2024]
Abstract
Dissolved organic matter (DOM), which is ubiquitously distributed in groundwater, has a crucial role in the fate and reactivity of iron materials. However, there is a lack of direct evidence on how different DOMs interact with nFe/Ni in promoting or inhibiting the dechlorination efficiency of chlorinated aromatic contaminants. By comparing humic acid (HA), fulvic acid (FA), and biochar-derived dissolved organic matter (BDOM) at different pyrolysis temperatures, we first demonstrated that the dechlorination effect of nFe/Ni on 2,4-dichlorophenol (2,4-DCP) depended on the nature of DOMs and their adsorption on nFe/Ni. HA showed an enhancing effect on the dechlorination of 2,4-DCP by nFe/Ni, while the inhibition effect of other DOMs resulted in the following dechlorination order: BDOM300 ≈FA>BDOM700 ≈BDOM500. The C2 component with higher aromaticity and molecular weight promoted the corrosion of nFe/Ni and the production of reactive hydrogen atoms (H*). The effects of different DOMs on nFe/Ni include that (1) HA accelerates the corrosion and H* production of nFe/Ni, (2) FA and BDOM300 enhance the corrosion but inhibit H* production, and (3) Both nFe/Ni corrosion and H* formation are suppressed by BDOM500/BDOM700. Therefore, this study will provide a reference for understanding the nature of DOM-nFe/Ni interaction and improving the catalytic activity of nFe/Ni when different DOMs coexist in practical applications.
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Affiliation(s)
- Cholnam Ri
- MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; Institute of Microbiology, State Academy of Sciences, Pyongyang, Democatic People's Republic of Korea
| | - Munchol Kim
- Institute of Microbiology, State Academy of Sciences, Pyongyang, Democatic People's Republic of Korea
| | - Hyokchol Mun
- MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China; Institute of National Energy, State Academy of Sciences, Pyongyang, Democatic People's Republic of Korea
| | - Linan Liu
- MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Jingchun Tang
- MOE Key Laboratory of Pollution Processes and Environmental Criteria/Tianjin Engineering Center of Environmental Diagnosis and Contamination Remediation, College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
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5
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Pan Z, Loreggian L, Roebbert Y, Bartova B, Hunault MOJ, Weyer S, Bernier-Latmani R. Pentavalent U Reactivity Impacts U Isotopic Fractionation during Reduction by Magnetite. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:6595-6604. [PMID: 38573735 PMCID: PMC11025122 DOI: 10.1021/acs.est.3c10324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Revised: 03/21/2024] [Accepted: 03/22/2024] [Indexed: 04/05/2024]
Abstract
Meaningful interpretation of U isotope measurements relies on unraveling the impact of reduction mechanisms on the isotopic fractionation. Here, the isotope fractionation of hexavalent U [U(VI)] was investigated during its reductive mineralization by magnetite to intermediate pentavalent U [U(V)] and ultimately tetravalent U [U(IV)]. As the reaction proceeded, the remaining aqueous phase U [containing U(VI) and U(V)] systematically carried light isotopes, whereas in the bicarbonate-extracted solution [containing U(VI) and U(V)], the δ238U values varied, especially when C/C0 approached 0. This variation was interpreted as reflecting the variable relative contribution of unreduced U(VI) (δ238U < 0‰) and bicarbonate-extractable U(V) (δ238U > 0‰). The solid remaining after bicarbonate extraction included unextractable U(V) and U(IV), for which the δ238U values consistently followed the same trend that started at 0.3-0.5‰ and decreased to ∼0‰. The impact of PIPES buffer on isotopic fractionation was attributed to the variable abundance of U(V) in the aqueous phase. A few extremely heavy bicarbonate-extracted δ238U values were due to mass-dependent fractionation resulting from several hypothesized mechanisms. The results suggest the preferential accumulation of the heavy isotope in the reduced species and the significant influence of U(V) on the overall isotopic fractionation, providing insight into the U isotope fractionation behavior during its abiotic reduction process.
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Affiliation(s)
- Zezhen Pan
- Department
of Environmental Science and Engineering, Fudan University, Shanghai 200438, China
- EML,
École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
- Institute
of Eco-Chongming (IEC), Shanghai 200062, China
| | - Luca Loreggian
- EML,
École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | - Yvonne Roebbert
- Institut
für Mineralogie, Leibniz Universität
Hannover, D-30167 Hannover, Germany
| | - Barbora Bartova
- EML,
École Polytechnique Fédérale de Lausanne, 1015 Lausanne, Switzerland
| | | | - Stefan Weyer
- Institut
für Mineralogie, Leibniz Universität
Hannover, D-30167 Hannover, Germany
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6
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Lu X, Zhang YY, Cheng W, Liu Y, Li Q, Li X, Dong F, Li J, Nie X. Chelating Effect of Siderophore Desferrioxamine-B on Uranyl Biomineralization Mediated by Shewanella putrefaciens. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:3974-3984. [PMID: 38306233 DOI: 10.1021/acs.est.3c05753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/04/2024]
Abstract
In contaminated water and soil, little is known about the role and mechanism of the biometabolic molecule siderophore desferrioxamine-B (DFO) in the biogeochemical cycle of uranium due to complicated coordination and reaction networks. Here, a joint experimental and quantum chemical investigation is carried out to probe the biomineralization of uranyl (UO22+, referred to as U(VI) hereafter) induced by Shewanella putrefaciens (abbreviated as S. putrefaciens) in the presence of DFO and Fe3+ ion. The results show that the production of mineralized solids {hydrogen-uranium mica [H2(UO2)2(PO4)2·8H2O]} via S. putrefaciens binding with UO22+ is inhibited by DFO, which can both chelate preferentially UO22+ to form a U(VI)-DFO complex in solution and seize it from U(VI)-biominerals upon solvation. However, with Fe3+ ion introduced, the strong specificity of DFO binding with Fe3+ causes re-emergence of biomineralization of UO22+ {bassetite [Fe(UO2)2(PO4)2·8(H2O)]} by S. putrefaciens, owing to competitive complexation between Fe3+ and UO22+ for DFO. As DFO possesses three hydroxamic functional groups, it forms hexadentate coordination with Fe3+ and UO22+ ions via these functional groups. The stability of the Fe3+-DFO complex is much higher than that of U(VI)-DFO, resulting in some DFO-released UO22+ to be remobilized by S. putrefaciens. Our finding not only adds to the understanding of the fate of toxic U(VI)-containing substances in the environment and biogeochemical cycles in the future but also suggests the promising potential of utilizing functionalized DFO ligands for uranium processing.
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Affiliation(s)
- Xiaojing Lu
- National Collaborative Innovation Center for Nuclear Waste and Environmental Safety, Southwest University of Science and Technology, Mianyang621000, China
- School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, China
| | - Yang-Yang Zhang
- Department of Chemistry and Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Wencai Cheng
- National Collaborative Innovation Center for Nuclear Waste and Environmental Safety, Southwest University of Science and Technology, Mianyang621000, China
| | - Yingzhangyang Liu
- National Collaborative Innovation Center for Nuclear Waste and Environmental Safety, Southwest University of Science and Technology, Mianyang621000, China
| | - Qingrong Li
- National Collaborative Innovation Center for Nuclear Waste and Environmental Safety, Southwest University of Science and Technology, Mianyang621000, China
| | - Xiaoan Li
- Mianyang Central Hospital, NHC Key Laboratory of Nuclear Technology Medical Transformation, Mianyang 621000, China
| | - Faqin Dong
- National Collaborative Innovation Center for Nuclear Waste and Environmental Safety, Southwest University of Science and Technology, Mianyang621000, China
- Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China
| | - Jun Li
- Department of Chemistry and Guangdong Provincial Key Laboratory of Catalytic Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
- Department of Chemistry and Engineering Research Center of Advanced Rare-Earth Materials of Ministry of Education, Tsinghua University, Beijing 100084, China
| | - Xiaoqin Nie
- National Collaborative Innovation Center for Nuclear Waste and Environmental Safety, Southwest University of Science and Technology, Mianyang621000, China
- Key Laboratory of Solid Waste Treatment and Resource Recycle of Ministry of Education, Southwest University of Science and Technology, Mianyang 621010, China
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7
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Dixon Wilkins MC, Townsend LT, Stennett MC, Kvashnina KO, Corkhill CL, Hyatt NC. A multimodal X-ray spectroscopy investigation of uranium speciation in ThTi 2O 6 compounds with the brannerite structure. Sci Rep 2023; 13:12776. [PMID: 37550380 PMCID: PMC10406819 DOI: 10.1038/s41598-023-38912-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2023] [Accepted: 07/17/2023] [Indexed: 08/09/2023] Open
Abstract
ThTi2O6 derived compounds with the brannerite structure were designed, synthesised, and characterised with the aim of stabilising incorporation of U5+ or U6+, at dilute concentration. Appropriate charge compensation was targeted by co-substitution of Gd3+, Ca2+, Al3+, or Cr3+, on the Th or Ti site. U L3 edge X-ray Absorption Near Edge Spectroscopy (XANES) and High Energy Resolution Fluorescence Detected U M4 edge XANES evidenced U5+ as the major oxidation state in all compounds, with a minor fraction of U6+ (2-13%). The balance of X-ray and Raman spectroscopy data support uranate, rather than uranyl, as the dominant U6+ speciation in the reported brannerites. It is considered that the U6+ concentration was limited by unfavourable electrostatic repulsion arising from substitution in the octahedral Th or Ti sites, which share two or three edges, respectively, with neighbouring polyhedra in the brannerite structure.
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Affiliation(s)
- Malin C Dixon Wilkins
- Department of Materials Science and Engineering, University of Sheffield, Sheffield, UK
- School of Mechanical and Materials Engineering, Washington State University, Pullman, WA, 99164, USA
| | - Luke T Townsend
- Department of Materials Science and Engineering, University of Sheffield, Sheffield, UK
| | - Martin C Stennett
- Department of Materials Science and Engineering, University of Sheffield, Sheffield, UK
| | - Kristina O Kvashnina
- The Rossendorf Beamline at ESRF, CS 40220, 38043, Grenoble Cedex 9, France
- Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstrasse 400, 01328, Dresden, Germany
| | - Claire L Corkhill
- Department of Materials Science and Engineering, University of Sheffield, Sheffield, UK.
- School of Earth Sciences, The University of Bristol, Bristol, BS8 1RL, UK.
| | - Neil C Hyatt
- Department of Materials Science and Engineering, University of Sheffield, Sheffield, UK
- School of Mechanical and Materials Engineering, Washington State University, Pullman, WA, 99164, USA
- School of Earth Sciences, The University of Bristol, Bristol, BS8 1RL, UK
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8
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Schacherl B, Joseph C, Beck A, Lavrova P, Schnurr A, Dardenne K, Geyer F, Cherkezova-Zheleva Z, Göttlicher J, Geckeis H, Vitova T. Np(V) Retention at the Illite du Puy Surface. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:11185-11194. [PMID: 37460108 PMCID: PMC10399294 DOI: 10.1021/acs.est.2c09356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 08/02/2023]
Abstract
In this study, Np(V) retention on Illite du Puy (IdP) was investigated since it is essential for understanding the migration behavior of Np in argillaceous environments. The presence of structural Fe(III) and Fe(II) in IdP was confirmed by Fe K-edge X-ray absorption near-edge structure (XANES) and 57Fe Mössbauer spectroscopy. In batch sorption experiments, a higher Np sorption affinity to IdP was found than to Wyoming smectite or iron-free synthetic montmorillonite. An increase of the relative Np(IV) ratio sorbed onto IdP with decreasing pH was observed by solvent extraction (up to (24 ± 2)% at pH 5, c0(Np) = 10-6 mol/L). Furthermore, up to (33 ± 5)% Np(IV) could be detected in IdP diffusion samples at pH 5. Respective Np M5-edge high-energy resolution (HR-) XANES spectra suggested the presence of Np(IV/V) mixtures and weakened axial bond covalency of the NpO2+ species sorbed onto IdP. Np L3-edge extended X-ray absorption fine structure (EXAFS) analysis showed that significant fractions of Np were coordinated to Fe─O entities at pH 9. This highlights the potential role of Fe(II/III) clay edge sites as a strong Np(V) surface complex partner and points to the partial reduction of sorbed Np(V) to Np(IV) via structural Fe(II).
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Affiliation(s)
- Bianca Schacherl
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Claudia Joseph
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Aaron Beck
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Polina Lavrova
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Andreas Schnurr
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Kathy Dardenne
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Frank Geyer
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Zara Cherkezova-Zheleva
- Institute of Catalysis, Bulgarian Academy of Sciences, "Acad. G. Bonchev" Str., Bl.11, 1113 Sofia, Bulgaria
| | - Jörg Göttlicher
- Karlsruhe Institute of Technology (KIT), Institute for Photon Science and Synchrotron Radiation (IPS), P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Horst Geckeis
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, D-76021 Karlsruhe, Germany
| | - Tonya Vitova
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE), P.O. Box 3640, D-76021 Karlsruhe, Germany
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9
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Misael WA, Severo Pereira Gomes A. Core Excitations of Uranyl in Cs 2UO 2Cl 4 from Relativistic Embedded Damped Response Time-Dependent Density Functional Theory Calculations. Inorg Chem 2023; 62:11589-11601. [PMID: 37432868 DOI: 10.1021/acs.inorgchem.3c01302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/13/2023]
Abstract
X-ray spectroscopies, by their high selectivity and sensitivity to the chemical environment around the atoms probed, provide significant insights into the electronic structures of molecules and materials. Interpreting experimental results requires reliable theoretical models, accounting for environmental, relativistic, electron correlation, and orbital relaxation effects in a balanced manner. In this work, we present a protocol for the simulation of core excited spectra with damped response time-dependent density functional theory based on the Dirac-Coulomb Hamiltonian (4c-DR-TD-DFT), in which environmental effects are accounted for through the frozen density embedding (FDE) method. We showcase this approach for the uranium M4- and L3-edges and oxygen K-edge of the uranyl tetrachloride (UO2Cl42-) unit as found in a host Cs2UO2Cl4 crystal. We have found that the 4c-DR-TD-DFT simulations yield excitation spectra that very closely match the experiment for the uranium M4-edge and the oxygen K-edge, with good agreement for the broad experimental spectra for the L3-edge. By decomposing the complex polarizability in terms of its components, we have been able to correlate our results with angle-resolved spectra. We have observed that for all edges, but in particular the uranium M4-edge, an embedded model in which the chloride ligands are replaced by an embedding potential reproduces rather well the spectral profile obtained for UO2Cl42-. Our results underscore the importance of the equatorial ligands to simulating core spectra at both uranium and oxygen edges.
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Affiliation(s)
- Wilken Aldair Misael
- Univ. Lille, CNRS, UMR 8523-PhLAM-Physique des Lasers Atomes et Molécules, F-59000 Lille, France
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10
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Hilpmann S, Rossberg A, Steudtner R, Drobot B, Hübner R, Bok F, Prieur D, Bauters S, Kvashnina KO, Stumpf T, Cherkouk A. Presence of uranium(V) during uranium(VI) reduction by Desulfosporosinus hippei DSM 8344 T. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 875:162593. [PMID: 36889400 DOI: 10.1016/j.scitotenv.2023.162593] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 02/27/2023] [Accepted: 02/27/2023] [Indexed: 06/18/2023]
Abstract
Microbial U(VI) reduction influences uranium mobility in contaminated subsurface environments and can affect the disposal of high-level radioactive waste by transforming the water-soluble U(VI) to less mobile U(IV). The reduction of U(VI) by the sulfate-reducing bacterium Desulfosporosinus hippei DSM 8344T, a close phylogenetic relative to naturally occurring microorganism present in clay rock and bentonite, was investigated. D. hippei DSM 8344T showed a relatively fast removal of uranium from the supernatants in artificial Opalinus Clay pore water, but no removal in 30 mM bicarbonate solution. Combined speciation calculations and luminescence spectroscopic investigations showed the dependence of U(VI) reduction on the initial U(VI) species. Scanning transmission electron microscopy coupled with energy-dispersive X-ray spectroscopy showed uranium-containing aggregates on the cell surface and some membrane vesicles. By combining different spectroscopic techniques, including UV/Vis spectroscopy, as well as uranium M4-edge X-ray absorption near-edge structure recorded in high-energy-resolution fluorescence-detection mode and extended X-ray absorption fine structure analysis, the partial reduction of U(VI) could be verified, whereby the formed U(IV) product has an unknown structure. Furthermore, the U M4 HERFD-XANES showed the presence of U(V) during the process. These findings offer new insights into U(VI) reduction by sulfate-reducing bacteria and contribute to a comprehensive safety concept for a repository for high-level radioactive waste.
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Affiliation(s)
- Stephan Hilpmann
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - André Rossberg
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany; Rossendorf Beamline (BM20-ROBL), European Synchrotron Radiation Facility, Grenoble, France
| | - Robin Steudtner
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - Björn Drobot
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - René Hübner
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Ion Beam Physics and Materials Research, Dresden, Germany
| | - Frank Bok
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - Damien Prieur
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany; Rossendorf Beamline (BM20-ROBL), European Synchrotron Radiation Facility, Grenoble, France
| | - Stephen Bauters
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany; Rossendorf Beamline (BM20-ROBL), European Synchrotron Radiation Facility, Grenoble, France
| | - Kristina O Kvashnina
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany; Rossendorf Beamline (BM20-ROBL), European Synchrotron Radiation Facility, Grenoble, France
| | - Thorsten Stumpf
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany
| | - Andrea Cherkouk
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstraße 400, 01328 Dresden, Germany.
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11
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Li M, Xu W, Wu X, Zhang X, Fang Q, Cai T, Yang J, Hua Y. Enhanced mechanism of calcium towards uranium incorporation and stability in magnetite during electromineralization. JOURNAL OF HAZARDOUS MATERIALS 2023; 457:131641. [PMID: 37329595 DOI: 10.1016/j.jhazmat.2023.131641] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2023] [Revised: 05/05/2023] [Accepted: 05/13/2023] [Indexed: 06/19/2023]
Abstract
Doping uranium into a room-temperature stable Fe3O4 lattice structure effectively reduces its migration. However, the synergistic or competitive effects of coexisting ions in an aqueous solution directly affect the uranium mineralization efficiency and the structural stability of uranium-bearing Fe3O4. The effects of calcium, carbonate, and phosphate on uranium electromineralization were investigated via batch experiments and theoretical calculations. Calcium incorporated into the Fe3O4 lattice increased the level and stability of doped uranium in Fe3O4. Uranium and calcium occupied the octahedral and tetrahedral sites of Fe3O4, respectively; the formation energy was only -10.23 eV due to strong hybridization effects between Fe1s, U4f, O2p, and Ca3d orbitals. Compared to the uranium-doped Fe3O4, uranium leaching ratios decreased by 19.2 % and 48.9 % under strongly acidic and alkaline conditions after 120 days. However, high concentrations of phosphate inhibited Fe3O4 crystallization. These results should provide new avenues for the development of multi-metal co-doping technologies and mineralization optimization to treat uranium-containing complex wastewater.
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Affiliation(s)
- Mi Li
- School of Resource & Environment and Safety Engineering, University of South China, Hengyang 421001, China
| | - Wanqin Xu
- School of Resource & Environment and Safety Engineering, University of South China, Hengyang 421001, China
| | - Xiaoyan Wu
- School of Resource & Environment and Safety Engineering, University of South China, Hengyang 421001, China
| | - Xiaowen Zhang
- Hengyang Key Laboratory of Soil Pollution Control and Remediation, University of South China, Hengyang 421001, China
| | - Qi Fang
- School of Resource & Environment and Safety Engineering, University of South China, Hengyang 421001, China
| | - Tao Cai
- School of Resource & Environment and Safety Engineering, University of South China, Hengyang 421001, China
| | - Jianping Yang
- School of Resource & Environment and Safety Engineering, University of South China, Hengyang 421001, China; State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
| | - Yilong Hua
- School of Resource & Environment and Safety Engineering, University of South China, Hengyang 421001, China; State Key Laboratory for Modification of Chemical Fibers and Polymer Materials, College of Materials Science and Engineering, Donghua University, Shanghai 201620, China.
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12
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Molinas M, Meibom KL, Faizova R, Mazzanti M, Bernier-Latmani R. Mechanism of Reduction of Aqueous U(V)-dpaea and Solid-Phase U(VI)-dpaea Complexes: The Role of Multiheme c-Type Cytochromes. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:7537-7546. [PMID: 37133831 DOI: 10.1021/acs.est.3c00666] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The biological reduction of soluble U(VI) complexes to form immobile U(IV) species has been proposed to remediate contaminated sites. It is well established that multiheme c-type cytochromes (MHCs) are key mediators of electron transfer to aqueous phase U(VI) complexes for bacteria such as Shewanella oneidensis MR-1. Recent studies have confirmed that the reduction proceeds via a first electron transfer forming pentavalent U(V) species that readily disproportionate. However, in the presence of the stabilizing aminocarboxylate ligand, dpaea2- (dpaeaH2═bis(pyridyl-6-methyl-2-carboxylate)-ethylamine), biologically produced U(V) persisted in aqueous solution at pH 7. We aim to pinpoint the role of MHC in the reduction of U(V)-dpaea and to establish the mechanism of solid-phase U(VI)-dpaea reduction. To that end, we investigated U-dpaea reduction by two deletion mutants of S. oneidensis MR-1-one lacking outer membrane MHCs and the other lacking all outer membrane MHCs and a transmembrane MHC-and by the purified outer membrane MHC, MtrC. Our results suggest that solid-phase U(VI)-dpaea is reduced primarily by outer membrane MHCs. Additionally, MtrC can directly transfer electrons to U(V)-dpaea to form U(IV) species but is not strictly necessary, underscoring the primary involvement of outer membrane MHCs in the reduction of this pentavalent U species but not excluding that of periplasmic MHCs.
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Affiliation(s)
- Margaux Molinas
- Environmental Microbiology Laboratory, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Karin Lederballe Meibom
- Environmental Microbiology Laboratory, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Radmila Faizova
- Group of Coordination Chemistry, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Marinella Mazzanti
- Group of Coordination Chemistry, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland
| | - Rizlan Bernier-Latmani
- Environmental Microbiology Laboratory, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland
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13
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Uranium oxides structural transformation in human body liquids. Sci Rep 2023; 13:4088. [PMID: 36906622 PMCID: PMC10008576 DOI: 10.1038/s41598-023-31059-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2022] [Accepted: 03/06/2023] [Indexed: 03/13/2023] Open
Abstract
Uranium oxide microparticles ingestion is one of the potential sources of internal radiation doses to the humans at accidental or undesirable releases of radioactive materials. It is important to predict the obtained dose and possible biological effect of these microparticles by studying uranium oxides transformations in case of their ingestion or inhalation. Using a combination of methods, a complex examination of structural changes of uranium oxides in the range from UO2 to U4O9, U3O8 and UO3 as well as before and after exposure of uranium oxides in simulated biological fluids: gastro-intestinal and lung-was carried out. Oxides were thoroughly characterized by Raman and XAFS spectroscopy. It was determined that the duration of expose has more influence on all oxides transformations. The greatest changes occurred in U4O9, that transformed into U4O9-y. UO2.05 and U3O8 structures became more ordered and UO3 did not undergo significant transformation.
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14
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Fallon CM, Bower WR, Powell BA, Livens FR, Lyon IC, McNulty AE, Peruski K, Mosselmans JFW, Kaplan DI, Grolimund D, Warnicke P, Ferreira-Sanchez D, Kauppi MS, Vettese GF, Shaw S, Morris K, Law GTW. Vadose-zone alteration of metaschoepite and ceramic UO 2 in Savannah River Site field lysimeters. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 862:160862. [PMID: 36521613 DOI: 10.1016/j.scitotenv.2022.160862] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/29/2022] [Revised: 11/25/2022] [Accepted: 12/07/2022] [Indexed: 06/17/2023]
Abstract
Uranium dioxide (UO2) and metaschoepite (UO3•nH2O) particles have been identified as contaminants at nuclear sites. Understanding their behavior and impact is crucial for safe management of radioactively contaminated land and to fully understand U biogeochemistry. The Savannah River Site (SRS) (South Carolina, USA), is one such contaminated site, following historical releases of U-containing wastes to the vadose zone. Here, we present an insight into the behavior of these two particle types under dynamic conditions representative of the SRS, using field lysimeters (15 cm D x 72 cm L). Discrete horizons containing the different particle types were placed at two depths in each lysimeter (25 cm and 50 cm) and exposed to ambient rainfall for 1 year, with an aim of understanding the impact of dynamic, shallow subsurface conditions on U particle behavior and U migration. The dissolution and migration of U from the particle sources and the speciation of U throughout the lysimeters was assessed after 1 year using a combination of sediment digests, sequential extractions, and bulk and μ-focus X-ray spectroscopy. In the UO2 lysimeter, oxidative dissolution of UO2 and subsequent migration of U was observed over 1-2 cm in the direction of waterflow and against it. Sequential extractions of the UO2 sources suggest they were significantly altered over 1 year. The metaschoepite particles also showed significant dissolution with marginally enhanced U migration (several cm) from the sources. However, in both particle systems the released U was quantitively retained in sediment as a range of different U(IV) and U(VI) phases, and no detectable U was measured in the lysimeter effluent. The study provides a useful insight into U particle behavior in representative, real-world conditions relevant to the SRS, and highlights limited U migration from particle sources due to secondary reactions with vadose zone sediments over 1 year.
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Affiliation(s)
- Connaugh M Fallon
- Centre for Radiochemistry Research, Department of Chemistry, The University of Manchester, Manchester M13 9PL, UK,; Research Centre for Radwaste and Decommissioning and Williamson Research Centre, Department of Earth and Environmental Sciences, The University of Manchester, Manchester M13 9PL, UK
| | - William R Bower
- Centre for Radiochemistry Research, Department of Chemistry, The University of Manchester, Manchester M13 9PL, UK,; Radiochemistry Unit, Department of Chemistry, University of Helsinki, Helsinki 00014, Finland
| | - Brian A Powell
- Department of Environmental Engineering and Earth Sciences, Department of Chemistry, Clemson University, Clemson, SC 29634, USA
| | - Francis R Livens
- Centre for Radiochemistry Research, Department of Chemistry, The University of Manchester, Manchester M13 9PL, UK,; Research Centre for Radwaste and Decommissioning and Williamson Research Centre, Department of Earth and Environmental Sciences, The University of Manchester, Manchester M13 9PL, UK
| | - Ian C Lyon
- Research Centre for Radwaste and Decommissioning and Williamson Research Centre, Department of Earth and Environmental Sciences, The University of Manchester, Manchester M13 9PL, UK
| | - Alana E McNulty
- Research Centre for Radwaste and Decommissioning and Williamson Research Centre, Department of Earth and Environmental Sciences, The University of Manchester, Manchester M13 9PL, UK
| | - Kathryn Peruski
- Department of Environmental Engineering and Earth Sciences, Department of Chemistry, Clemson University, Clemson, SC 29634, USA
| | | | - Daniel I Kaplan
- Savannah River Ecology Laboratory, University of Georgia, Aiken, SC 29808, USA
| | - Daniel Grolimund
- Swiss Light Source, Paul Scherrer Institute, Villigen CH-5232, Switzerland
| | - Peter Warnicke
- Swiss Light Source, Paul Scherrer Institute, Villigen CH-5232, Switzerland
| | | | - Marja Siitari Kauppi
- Radiochemistry Unit, Department of Chemistry, University of Helsinki, Helsinki 00014, Finland
| | - Gianni F Vettese
- Radiochemistry Unit, Department of Chemistry, University of Helsinki, Helsinki 00014, Finland
| | - Samuel Shaw
- Research Centre for Radwaste and Decommissioning and Williamson Research Centre, Department of Earth and Environmental Sciences, The University of Manchester, Manchester M13 9PL, UK
| | - Katherine Morris
- Research Centre for Radwaste and Decommissioning and Williamson Research Centre, Department of Earth and Environmental Sciences, The University of Manchester, Manchester M13 9PL, UK
| | - Gareth T W Law
- Radiochemistry Unit, Department of Chemistry, University of Helsinki, Helsinki 00014, Finland.
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15
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Stagg O, Morris K, Townsend LT, Kvashnina KO, Baker ML, Dempsey RL, Abrahamsen-Mills L, Shaw S. Sulfidation and Reoxidation of U(VI)-Incorporated Goethite: Implications for U Retention during Sub-Surface Redox Cycling. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:17643-17652. [PMID: 36449568 PMCID: PMC9775214 DOI: 10.1021/acs.est.2c05314] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Revised: 11/06/2022] [Accepted: 11/08/2022] [Indexed: 06/17/2023]
Abstract
Over 60 years of nuclear activity have resulted in a global legacy of contaminated land and radioactive waste. Uranium (U) is a significant component of this legacy and is present in radioactive wastes and at many contaminated sites. U-incorporated iron (oxyhydr)oxides may provide a long-term barrier to U migration in the environment. However, reductive dissolution of iron (oxyhydr)oxides can occur on reaction with aqueous sulfide (sulfidation), a common environmental species, due to the microbial reduction of sulfate. In this work, U(VI)-goethite was initially reacted with aqueous sulfide, followed by a reoxidation reaction, to further understand the long-term fate of U species under fluctuating environmental conditions. Over the first day of sulfidation, a transient release of aqueous U was observed, likely due to intermediate uranyl(VI)-persulfide species. Despite this, overall U was retained in the solid phase, with the formation of nanocrystalline U(IV)O2 in the sulfidized system along with a persistent U(V) component. On reoxidation, U was associated with an iron (oxyhydr)oxide phase either as an adsorbed uranyl (approximately 65%) or an incorporated U (35%) species. These findings support the overarching concept of iron (oxyhydr)oxides acting as a barrier to U migration in the environment, even under fluctuating redox conditions.
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Affiliation(s)
- Olwen Stagg
- Research
Centre for Radwaste Disposal and Williamson Research Centre for Molecular
Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, ManchesterM13 9PL, U.K.
| | - Katherine Morris
- Research
Centre for Radwaste Disposal and Williamson Research Centre for Molecular
Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, ManchesterM13 9PL, U.K.
| | - Luke Thomas Townsend
- Research
Centre for Radwaste Disposal and Williamson Research Centre for Molecular
Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, ManchesterM13 9PL, U.K.
| | - Kristina O. Kvashnina
- The
Rossendorf Beamline at ESRF—The European Synchrotron, CS40220, Grenoble Cedex 938043France
- Institute
of Resource Ecology, Helmholtz Zentrum Dresden
Rossendorf (HZDR), Dresden01314, Germany
| | - Michael L. Baker
- Department
of Chemistry, The University of Manchester, ManchesterM13 9PL, U.K.
- The
University of Manchester at Harwell, The University of Manchester, Diamond Light Source, Harwell Campus, DidcotOX11 0DE, U.K.
| | - Ryan L. Dempsey
- Department
of Chemistry, The University of Manchester, ManchesterM13 9PL, U.K.
| | | | - Samuel Shaw
- Research
Centre for Radwaste Disposal and Williamson Research Centre for Molecular
Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, ManchesterM13 9PL, U.K.
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16
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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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17
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Kusaka R, Kumagai Y, Watanabe M, Sasaki T, Akiyama D, Sato N, Kirishima A. Raman identification and characterization of chemical components included in simulated nuclear fuel debris synthesized from uranium, stainless steel, and zirconium. J NUCL SCI TECHNOL 2022. [DOI: 10.1080/00223131.2022.2128460] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Affiliation(s)
- Ryoji Kusaka
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency (JAEA), Tokai, Japan
| | - Yuta Kumagai
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency (JAEA), Tokai, Japan
| | - Masayuki Watanabe
- Nuclear Science and Engineering Center, Japan Atomic Energy Agency (JAEA), Tokai, Japan
| | - Takayuki Sasaki
- Department of Nuclear Engineering, Kyoto University, Kyoto Daigaku-Katsura, Nishikyo, Japan
| | - Daisuke Akiyama
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan
| | - Nobuaki Sato
- Center for Fundamental Research on Nuclear Decommissioning, Tohoku University, Sendai, Japan
| | - Akira Kirishima
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai, Japan
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18
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Yin Y, Liu C, Zhao G, Chen Y. Versatile mechanisms and enhanced strategies of pollutants removal mediated by Shewanella oneidensis: A review. JOURNAL OF HAZARDOUS MATERIALS 2022; 440:129703. [PMID: 35963088 DOI: 10.1016/j.jhazmat.2022.129703] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Revised: 07/17/2022] [Accepted: 07/29/2022] [Indexed: 06/15/2023]
Abstract
The removal of environmental pollutants is important for a sustainable ecosystem and human health. Shewanella oneidensis (S. oneidensis) has diverse electron transfer pathways and can use a variety of contaminants as electron acceptors or electron donors. This paper reviews S. oneidensis's function in removing environmental pollutants, including heavy metals, inorganic non-metallic ions (INMIs), and toxic organic pollutants. S. oneidensis can mineralize o-xylene (OX), phenanthrene (PHE), and pyridine (Py) as electron donors, and also reduce azo dyes, nitro aromatic compounds (NACs), heavy metals, and iodate by extracellular electron transfer (EET). For azo dyes, NACs, Cr(VI), nitrite, nitrate, thiosulfate, and sulfite that can cross the membrane, S. oneidensis transfers electrons to intracellular reductases to catalyze their reduction. However, most organic pollutants cannot be directly degraded by S. oneidensis, but S. oneidensis can remove these pollutants by self-synthesizing catalysts or photocatalysts, constructing bio-photocatalytic systems, driving Fenton reactions, forming microbial consortia, and genetic engineering. However, the industrial-scale application of S. oneidensis is insufficient. Future research on the metabolism of S. oneidensis and interfacial reactions with other materials needs to be deepened, and large-scale reactors should be developed that can be used for practical engineering applications.
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Affiliation(s)
- Yue Yin
- State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Chao Liu
- State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China
| | - Guohua Zhao
- School of Chemical Science and Engineering, Tongji University, Shanghai 200092, China
| | - Yinguang Chen
- State Key Laboratory of Pollution Control and Resources Reuse, School of Environmental Science and Engineering, Tongji University, Shanghai 200092, China.
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19
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Vitova T, Faizova R, Amaro-Estrada JI, Maron L, Pruessmann T, Neill T, Beck A, Schacherl B, Tirani FF, Mazzanti M. The mechanism of Fe induced bond stability of uranyl(v). Chem Sci 2022; 13:11038-11047. [PMID: 36320468 PMCID: PMC9517057 DOI: 10.1039/d2sc03416f] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2022] [Accepted: 08/03/2022] [Indexed: 08/02/2023] Open
Abstract
The stabilization of uranyl(v) (UO2 1 + ) by Fe(ii) in natural systems remains an open question in uranium chemistry. Stabilization of UVO2 1+ by Fe(ii) against disproportionation was also demonstrated in molecular complexes. However, the relation between the Fe(ii) induced stability and the change of the bonding properties have not been elucidated up to date. We demonstrate that U(v) - oaxial bond covalency decreases upon binding to Fe(ii) inducing redirection of electron density from the U(v) - oaxial bond towards the U(v) - equatorial bonds thereby increasing bond covalency. Our results indicate that such increased covalent interaction of U(v) with the equatorial ligands resulting from iron binding lead to higher stability of uranyl(v). For the first time a combination of U M4,5 high energy resolution X-ray absorption near edge structure (HR-XANES) and valence band resonant inelastic X-ray scattering (VB-RIXS) and ab initio multireference CASSCF and DFT based computations were applied to establish the electronic structure of iron-bound uranyl(v).
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Affiliation(s)
- Tonya Vitova
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE) P.O. 3640 D-76021 Karlsruhe Germany
| | - Radmila Faizova
- Group of Coordination Chemistry, Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
| | - Jorge I Amaro-Estrada
- LPCNO, University of Toulouse INSA Toulouse 135, Avenue de Rangueil Toulouse Cedex 31077 France
| | - Laurent Maron
- LPCNO, University of Toulouse INSA Toulouse 135, Avenue de Rangueil Toulouse Cedex 31077 France
| | - Tim Pruessmann
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE) P.O. 3640 D-76021 Karlsruhe Germany
| | - Thomas Neill
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE) P.O. 3640 D-76021 Karlsruhe Germany
| | - Aaron Beck
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE) P.O. 3640 D-76021 Karlsruhe Germany
| | - Bianca Schacherl
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal (INE) P.O. 3640 D-76021 Karlsruhe Germany
| | - Farzaneh Fadaei Tirani
- Group of Coordination Chemistry, Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
| | - Marinella Mazzanti
- Group of Coordination Chemistry, Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
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20
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Ilton ES, Collins RN, Ciobanu CL, Cook NJ, Verdugo-Ihl M, Slattery AD, Paterson DJ, Mergelsberg ST, Bylaska EJ, Ehrig K. Pentavalent Uranium Incorporated in the Structure of Proterozoic Hematite. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:11857-11864. [PMID: 35876701 DOI: 10.1021/acs.est.2c02113] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Characterizing the chemical state and physical disposition of uranium that has persisted over geologic time scales is key for modeling the long-term geologic sequestration of nuclear waste, accurate uranium-lead dating, and the use of uranium isotopes as paleo redox proxies. X-ray absorption spectroscopy coupled with molecular dynamics modeling demonstrated that pentavalent uranium is incorporated in the structure of 1.6 billion year old hematite (α-Fe2O3), attesting to the robustness of Fe oxides as waste forms and revealing the reason for the great success in using hematite for petrogenic dating. The extreme antiquity of this specimen suggests that the pentavalent state of uranium, considered a transient, is stable when incorporated into hematite, a ubiquitous phase that spans the crustal continuum. Thus, it would appear overly simplistic to assume that only the tetravalent and hexavalent states are relevant when interpreting the uranium isotopic record from ancient crust and contained ore systems.
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Affiliation(s)
- Eugene S Ilton
- Pacific Northwest National Laboratory, Richland, Washington 99353, United States
| | - Richard N Collins
- University of New South Wales, Sydney New South Wales 2052, Australia
| | - Cristiana L Ciobanu
- School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, South Australia, 5005, Australia
| | - Nigel J Cook
- School of Civil, Environmental, and Mining Engineering, The University of Adelaide, Adelaide, South Australia, 5005, Australia
| | - Max Verdugo-Ihl
- School of Chemical Engineering and Advanced Materials, The University of Adelaide, Adelaide, South Australia, 5005, Australia
| | - Ashley D Slattery
- Adelaide Microscopy, The University of Adelaide, Adelaide, South Australia, 5005, Australia
| | - David J Paterson
- Australian Synchrotron, 800 Blackburn Road, Clayton Victoria 3168, Australia
| | | | - Eric J Bylaska
- Pacific Northwest National Laboratory, Richland, Washington 99353, United States
| | - Kathy Ehrig
- BHP Olympic Dam, 10 Franklin Street, Adelaide, South Australia 5000, Australia
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21
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Gandhi TP, Sampath PV, Maliyekkal SM. A critical review of uranium contamination in groundwater: Treatment and sludge disposal. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 825:153947. [PMID: 35189244 DOI: 10.1016/j.scitotenv.2022.153947] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Revised: 01/24/2022] [Accepted: 02/13/2022] [Indexed: 06/14/2023]
Abstract
Dissolved uranium in groundwater at high concentrations is an emerging global threat to human and ecological health due to its radioactivity and chemical toxicity. Uranium can enter groundwater by geochemical reactions, natural deposition from minerals, mining, uranium ore processing, and spent fuel disposal. Although much progress has been made in uranium remediation in recent years, most published reviews on uranium treatment have focused on specific methods, particularly adsorption. This article systematically reviews the major treatment technologies, explains their mechanism and progress of uranium removal, and compares their performance under various environmental conditions. Of all treatment methods, adsorption has received much attention due to its ease of use and adaptability under various conditions. However, salinity and competition from other ions limit its application in actual field conditions. Biosorption and bioremediation are also promising methods due to their low-cost and chemical-free operation. Strong base anion exchange resins are more effective at typical groundwater pH conditions. Advanced oxidation processes like photocatalysis produce less sludge and are effective even at low uranium concentrations. Electrocoagulation shows significantly improved performance when organic ligands are added prior to treatment. The significant advantages of membrane filtration are high removal efficiency and the ability to recover uranium. While each technology has its merits and demerits, no single technology is entirely suitable under all conditions. One major area of concern with all technologies is the need to dispose of liquid and solid waste generated after treatment safely. Future research must focus on developing hybrid and state-of-the-art technologies for effective and sustainable uranium removal from groundwater. Developing holistic management strategies for uranium removal will hinge on understanding its speciation, mechanisms of fate and transport, and socio-economic conditions of the affected areas.
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Affiliation(s)
- T Pushparaj Gandhi
- Department of Civil and Environmental Engineering, Indian Institute of Technology Tirupati, Yerpedu, 517619, India
| | - Prasanna Venkatesh Sampath
- Department of Civil and Environmental Engineering, Indian Institute of Technology Tirupati, Yerpedu, 517619, India
| | - Shihabudheen M Maliyekkal
- Department of Civil and Environmental Engineering, Indian Institute of Technology Tirupati, Yerpedu, 517619, India.
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22
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Evidence for in-situ electric-induced uranium incorporation into magnetite crystal in acidic wastewater. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.120957] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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23
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Huang FY, Wang Z, Yi FC, Liu Y, Wu YD, Luo Y, Jia WJ. Sorption Behavior and Mechanism of Simulated Radionuclide Nd(III) from Aqueous Solution by Bentonite. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2022. [DOI: 10.1134/s0036024422050107] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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24
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Satpathy A, Catalano JG, Giammar DE. Reduction of U(VI) on Chemically Reduced Montmorillonite and Surface Complexation Modeling of Adsorbed U(IV). ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:4111-4120. [PMID: 35290018 DOI: 10.1021/acs.est.1c06814] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Adsorption and subsequent reduction of U(VI) on Fe(II)-bearing clay minerals can control the mobility of uranium in subsurface environments. Clays such as montmorillonite provide substantial amounts of the reactive surface area in many subsurface environments, and montmorillonite-containing materials are used in the storage of spent nuclear fuel. We investigated the extent of reduction of U(VI) by Fe(II)-bearing montmorillonite at different pH values and sodium concentrations using X-ray absorption spectroscopy and chemical extractions. Nearly complete reduction of U(VI) to U(IV) occurred at a low sodium concentration at both pH 3 and 6. At pH 6 and a high sodium concentration, which inhibits U(VI) binding at cation-exchange sites, the extent of U(VI) reduction was only 70%. Surface-bound U(VI) on unreduced montmorillonite was more easily extracted into solution with bicarbonate than surface-bound U(IV) generated by reduction of U(VI) on Fe(II)-bearing montmorillonite. We developed a nonelectrostatic surface complexation model to interpret the equilibrium adsorption of U(IV) on Fe(II)-bearing montmorillonite as a function of pH and sodium concentration. These findings establish the potential importance of structural Fe(II) in low iron content smectites in controlling uranium mobility in subsurface environments.
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Affiliation(s)
- Anshuman Satpathy
- Department of Civil and Environmental Engineering and Earth Sciences, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Jeffrey G Catalano
- Department of Earth and Planetary Sciences, Washington University in St. Louis, St. Louis, Missouri 63130, United States
| | - Daniel E Giammar
- Department of Energy, Environmental and Chemical Engineering, Washington University in St. Louis, St. Louis, Missouri 63130, United States
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25
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Schacherl B, Joseph C, Lavrova P, Beck A, Reitz C, Prüssmann T, Fellhauer D, Lee JY, Dardenne K, Rothe J, Geckeis H, Vitova T. Paving the way for examination of coupled redox/solid-liquid interface reactions: 1 ppm Np adsorbed on clay studied by Np M5-edge HR-XANES spectroscopy. Anal Chim Acta 2022; 1202:339636. [DOI: 10.1016/j.aca.2022.339636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2021] [Revised: 02/06/2022] [Accepted: 02/17/2022] [Indexed: 11/01/2022]
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26
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Kumar S, Rothe J, Finck N, Vitova T, Dardenne K, Beck A, Schild D, Geckeis H. Effect of manganese on the speciation of neptunium(V) on manganese doped magnetites. Colloids Surf A Physicochem Eng Asp 2022. [DOI: 10.1016/j.colsurfa.2021.128105] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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27
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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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28
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Kvashnina KO, Butorin SM. High-energy resolution X-ray spectroscopy at actinide M 4,5 and ligand K edges: what we know, what we want to know, and what we can know. Chem Commun (Camb) 2022; 58:327-342. [PMID: 34874022 PMCID: PMC8725612 DOI: 10.1039/d1cc04851a] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Accepted: 11/15/2021] [Indexed: 12/20/2022]
Abstract
In recent years, scientists have progressively recognized the role of electronic structures in the characterization of chemical properties for actinide containing materials. High-energy resolution X-ray spectroscopy at the actinide M4,5 edges emerged as a promising direction because this method can probe actinide properties at the atomic level through the possibility of reducing the experimental spectral width below the natural core-hole lifetime broadening. Parallel to the technical developments of the X-ray method and experimental discoveries, theoretical models, describing the observed electronic structure phenomena, have also advanced. In this feature article, we describe the latest progress in the field of high-energy resolution X-ray spectroscopy at the actinide M4,5 and ligand K edges and we show that the methods are able to (a) provide fingerprint information on the actinide oxidation state and ground state characters (b) probe 5f occupancy, non-stoichiometry, defects, and ligand/metal ratio and (c) investigate the local symmetry and effects of the crystal field. We discuss the chemical aspects of the electronic structure in terms familiar to chemists and materials scientists and conclude with a brief description of new opportunities and approaches to improve the experimental methodology and theoretical analysis for f-electron systems.
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Affiliation(s)
- Kristina O Kvashnina
- The Rossendorf Beamline at ESRF, The European Synchrotron, CS40220, 38043 Grenoble Cedex 9, France.
- Institute of Resource Ecology, Helmholtz Zentrum Dresden-Rossendorf (HZDR), PO Box 510119, 01314 Dresden, Germany
- Department of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia
| | - Sergei M Butorin
- Condensed Matter Physics of Energy Materials, X-ray Photon Science, Department of Physics and Astronomy, Uppsala University, P.O. Box 516, SE-751 20 Uppsala, Sweden.
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29
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Rasheed T, Kausar F, Rizwan K, Adeel M, Sher F, Alwadai N, Alshammari FH. Two dimensional MXenes as emerging paradigm for adsorptive removal of toxic metallic pollutants from wastewater. CHEMOSPHERE 2022; 287:132319. [PMID: 34826950 DOI: 10.1016/j.chemosphere.2021.132319] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 09/04/2021] [Accepted: 09/19/2021] [Indexed: 06/13/2023]
Abstract
Effective methods for removing harmful metals from wastewater have had a huge impact on reducing freshwater scarcity. Because of its excellent removal effectiveness, simplicity and low cost at ambient conditions, adsorption is one of the most promising purifying approaches. MXene-based nanoarchitectures have proven to be effective adsorbents in a variety of harmful metal removal applications. This owes from the distinctive features such as, hydrophilicity, high surface area, electron-richness, great adsorption capacity, and activated metallic hydroxide sites of MXenes. Given the rapid advancement in the design and synthesis of MXene nanoarchitectures for water treatment, prompt updates on this research area are needed that focus on removal of toxic metal, such as production routes and characterization techniques for the advantages, merits and limitations of MXenes for toxic metal adsorption. This is in addition to the fundamentals and the adsorption mechanism tailored by the shape and composition of MXene based on some representative paradigms. Finally, the limits of MXenes are highlighted, as well as their potential future research directions for wastewater treatment. This manuscript may initiate researchers to improve unique MXene-based nanostructures with distinct compositions, shapes, and physiochemical merits for effective removal of toxic metals from wastewater.
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Affiliation(s)
- Tahir Rasheed
- Interdisciplinary Research Center for Advanced Materials, King Fahd University of Petroleum and Minerals (KFUPM), Dhahran, 31261, Saudi Arabia.
| | - Fahmeeda Kausar
- School of Chemistry and Chemical Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China
| | - Komal Rizwan
- Department of Chemistry University of Sahiwal, Sahiwal, 57000, Pakistan
| | - Muhammad Adeel
- Faculty of Applied Engineering, IPRACS, University of Antwerp, 2020, Antwerp, Belgium
| | - Farooq Sher
- Department of Engineering, School of Science and Technology, Nottingham Trent University, Nottingham, NG11 8NS, United Kingdom
| | - Norah Alwadai
- Department of Physics, College of Sciences, Princess Nourah bint Abdulrahman University (PNU), Riyadh 11671, Saudi Arabia
| | - Fwzah H Alshammari
- Department of Physics, University Colleges at Nairiyah, University of Hafr Al Batin (UHB), Nairiyah 31981, Saudi Arabia
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30
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Vigier JF, Freis D, Walter O, Dieste Blanco O, Bouëxière D, Zuleger E, Palina N, Vitova T, Konings RJM, Popa K. Synthesis and characterization of homogeneous (U,Am)O 2 and (U,Pu,Am)O 2 nanopowders. CrystEngComm 2022; 24:6338-6348. [PMID: 36275942 PMCID: PMC9486969 DOI: 10.1039/d2ce00527a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Accepted: 06/11/2022] [Indexed: 12/31/2022]
Abstract
This paper details the first dedicated production of homogeneous nanocrystalline particles of mixed actinide oxide solid solutions containing americium. The target compositions were U0.75Pu0.20Am0.05O2, U0.90Am0.10O2 and U0.80Am0.20O2. After successful hydrothermal synthesis and chemical characterisation, the nanocrystals were sintered and their structure and behaviour under self-irradiation were studied by powder XRD. Cationic charge distribution of the as-prepared nanocrystalline and sintered U0.80Am0.20O2 materials was investigated applying U M4 and Am M5 edge high energy resolution XANES (HR-XANES). Typical oxidation states detected for the cations are U(iv)/U(v) and Am(iii)/Am(iv). The measured crystallographic swelling was systematically smaller for the as-synthesised nanoparticles than the sintered products. For sintered pellets, the maximal volumetric swelling was about 0.8% at saturation, in line with literature data for PuO2, AmO2, (U,Pu)O2 or (U,Am)O2. Sinterable homogeneous nanoparticles of [U,(Pu),Am]O2 are produced hydrothermally from corresponding oxalates. The uranium and americium oxidation states are diverse in both as-synthesized nanopowders and sintered materials.![]()
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Affiliation(s)
| | - Daniel Freis
- European Commission, Joint Research Centre (JRC), Karlsruhe, Germany
| | - Olaf Walter
- European Commission, Joint Research Centre (JRC), Karlsruhe, Germany
| | | | - Daniel Bouëxière
- European Commission, Joint Research Centre (JRC), Karlsruhe, Germany
| | - Evelyn Zuleger
- European Commission, Joint Research Centre (JRC), Karlsruhe, Germany
| | - Natalia Palina
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology, P.O. 3640, D-76021 Karlsruhe, Germany
| | - Tonya Vitova
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology, P.O. 3640, D-76021 Karlsruhe, Germany
| | | | - Karin Popa
- European Commission, Joint Research Centre (JRC), Karlsruhe, Germany
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31
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Stagg O, Morris K, Lam A, Navrotsky A, Velázquez JM, Schacherl B, Vitova T, Rothe J, Galanzew J, Neumann A, Lythgoe P, Abrahamsen-Mills L, Shaw S. Fe(II) Induced Reduction of Incorporated U(VI) to U(V) in Goethite. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:16445-16454. [PMID: 34882383 DOI: 10.1021/acs.est.1c06197] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Over 60 years of nuclear activities have resulted in a global legacy of radioactive wastes, with uranium considered a key radionuclide in both disposal and contaminated land scenarios. With the understanding that U has been incorporated into a range of iron (oxyhydr)oxides, these minerals may be considered a secondary barrier to the migration of radionuclides in the environment. However, the long-term stability of U-incorporated iron (oxyhydr)oxides is largely unknown, with the end-fate of incorporated species potentially impacted by biogeochemical processes. In particular, studies show that significant electron transfer may occur between stable iron (oxyhydr)oxides such as goethite and adsorbed Fe(II). These interactions can also induce varying degrees of iron (oxyhydr)oxide recrystallization (<4% to >90%). Here, the fate of U(VI)-incorporated goethite during exposure to Fe(II) was investigated using geochemical analysis and X-ray absorption spectroscopy (XAS). Analysis of XAS spectra revealed that incorporated U(VI) was reduced to U(V) as the reaction with Fe(II) progressed, with minimal recrystallization (approximately 2%) of the goethite phase. These results therefore indicate that U may remain incorporated within goethite as U(V) even under iron-reducing conditions. This develops the concept of iron (oxyhydr)oxides acting as a secondary barrier to radionuclide migration in the environment.
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Affiliation(s)
- Olwen Stagg
- Research Centre for Radwaste Disposal and Williamson Research Centre for Molecular Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, Manchester, M13 9PL, United Kingdom
| | - Katherine Morris
- Research Centre for Radwaste Disposal and Williamson Research Centre for Molecular Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, Manchester, M13 9PL, United Kingdom
| | - Andy Lam
- Peter A. Rock Thermochemistry Laboratory and NEAT ORU, University of California Davis, Davis, California 95616, United States
| | - Alexandra Navrotsky
- School of Molecular Sciences and Navrotsky Eyring Center for Materials of the Universe, Arizona State University, Tempe, Arizona 85287, United States
| | - Jesús M Velázquez
- Department of Chemistry, University of California─Davis, Davis, California 95616, United States
| | - Bianca Schacherl
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology, Karlsruhe 76131, Germany
| | - Tonya Vitova
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology, Karlsruhe 76131, Germany
| | - Jörg Rothe
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology, Karlsruhe 76131, Germany
| | - Jurij Galanzew
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology, Karlsruhe 76131, Germany
| | - Anke Neumann
- School of Engineering, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom
| | - Paul Lythgoe
- Manchester Analytical Geochemistry Unit, The University of Manchester, Manchester, M13 9PL, United Kingdom
| | | | - Samuel Shaw
- Research Centre for Radwaste Disposal and Williamson Research Centre for Molecular Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, Manchester, M13 9PL, United Kingdom
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32
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Roach JM, Manukyan KV, Majumdar A, Dede S, Oliver AG, Burns PC, Aprahamian A. Hyperstoichiometric Uranium Dioxides: Rapid Synthesis and Irradiation-Induced Structural Changes. Inorg Chem 2021; 60:18938-18949. [PMID: 34889599 DOI: 10.1021/acs.inorgchem.1c02736] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Uranium dioxide (UO2), the primary fuel for commercial nuclear reactors, incorporates excess oxygen forming a series of hyperstoichiometric oxides. Thin layers of these oxides, such as UO2.12, form readily on the fuel surface and influence its properties, performance, and potentially geologic disposal. This work reports a rapid and straightforward combustion process in uranyl nitrate-glycine-water solutions to prepare UO2.12 nanomaterials and thin films. We also report on the investigation of the structural changes induced in the material by irradiation. Despite the simple processing aspects, the combustion synthesis of UO2.12 has a sophisticated chemical mechanism involving several exothermic steps. Raman spectroscopy and single-crystal X-ray diffraction (XRD) measurements reveal the formation of a complex compound containing the uranyl moiety, glycine, H2O, and NO3- groups in reactive solutions and dried combustion precursors. Combustion diagnostic methods, gas-phase mass spectroscopy, differential scanning calorimetry (DSC), and extracted activation energies from DSC measurements show that the rate-limiting step of the process is the reaction of ammonia with nitrogen oxides formed from the decomposition of glycine and uranyl nitrate, respectively. However, the exothermic decomposition of the complex compound determines the maximum temperature of the process. In situ transmission electron microscopy (TEM) imaging and electron diffraction measurements show that the decomposition of the complex compound directly produces UO2. The incorporation of oxygen at the cooling stage of the combustion process is responsible for the formation of UO2.12. Spin coating of the solutions and brief annealing at 670 K allow the deposition of uniform films of UO2.12 with thicknesses up to 300 nm on an aluminum substrate. Irradiation of films with Ar2+ ions (1.7 MeV energy, a fluence of up to 1 × 1017 ions/cm2) shows unusual defect-simulated grain growth and enhanced chemical mixing of UO2.12 with the substrate due to the high uranium ion diffusion in films. The method described in this work allows the preparation of actinide oxide targets for fundamental nuclear science research and studies associated with stockpile stewardship.
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Affiliation(s)
- Jordan M Roach
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Khachatur V Manukyan
- Nuclear Science Laboratory, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Ashabari Majumdar
- Nuclear Science Laboratory, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Stefania Dede
- Nuclear Science Laboratory, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, United States.,Cyclotron Institute, Texas A&M University, College Station, Texas 77843, United States
| | - Allen G Oliver
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Peter C Burns
- Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States.,Department of Civil & Environmental Engineering & Earth Sciences, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Ani Aprahamian
- Nuclear Science Laboratory, Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, United States.,A. Alikhanyan National Science Laboratory of Armenia, 2 Alikhanyan Brothers, 0036 Yerevan, Armenia
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33
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Ye Y, Jin J, Liang Y, Qin Z, Tang X, Feng Y, Lv M, Miao S, Li C, Chen Y, Chen F, Wang Y. Efficient and durable uranium extraction from uranium mine tailings seepage water via a photoelectrochemical method. iScience 2021; 24:103230. [PMID: 34712926 PMCID: PMC8531663 DOI: 10.1016/j.isci.2021.103230] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2021] [Revised: 09/08/2021] [Accepted: 09/30/2021] [Indexed: 11/28/2022] Open
Abstract
Current photocatalytic uranium (U) extraction methods have intrinsic obstacles, such as the recombination of charge carriers, and the deactivation of catalysts by extracted U. Here we show that, by applying a bias potential on the photocatalyst, the photoelectrochemical (PEC) method can address these limitations. We demonstrate that, owing to efficient spatial charge-carriers separation driven by the applied bias, the PEC method enables efficient and durable U extraction. The effects of multiple operation conditions are investigated. The U extraction proceeds via single-step one-electron reduction, resulting in the formation of pentavalent U, which can facilitate future studies on this often-overlooked U species. In real seepage water the PEC method achieves an extraction capacity of 0.67 gU m-3·h-1 without deactivation for 156 h continuous operation, which is 17 times faster than the photocatalytic method. This work provides an alternative tool for U resource recovery and facilitates future studies on U(V) chemistry.
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Affiliation(s)
- Yin Ye
- School of Ecology and Environment, Northwestern Polytechnical University, 710129 Xi’an, P. R. China
| | - Jian Jin
- School of Ecology and Environment, Northwestern Polytechnical University, 710129 Xi’an, P. R. China
| | - Yanru Liang
- School of Ecology and Environment, Northwestern Polytechnical University, 710129 Xi’an, P. R. China
| | - Zemin Qin
- School of Ecology and Environment, Northwestern Polytechnical University, 710129 Xi’an, P. R. China
| | - Xin Tang
- School of Ecology and Environment, Northwestern Polytechnical University, 710129 Xi’an, P. R. China
| | - Yanyue Feng
- Department of Chemistry and Chemical Engineering, Chalmers University of Technology, 41296 Gothenburg, Sweden
| | - Miao Lv
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Shiyu Miao
- College of Eco-Environmental Engineering, Qinghai University, Xining 810016, P. R. China
| | - Cui Li
- School of Ecology and Environment, Northwestern Polytechnical University, 710129 Xi’an, P. R. China
| | - Yanlong Chen
- School of Ecology and Environment, Northwestern Polytechnical University, 710129 Xi’an, P. R. China
| | - Fan Chen
- School of Ecology and Environment, Northwestern Polytechnical University, 710129 Xi’an, P. R. China
| | - Yuheng Wang
- School of Ecology and Environment, Northwestern Polytechnical University, 710129 Xi’an, P. R. China
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34
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Prieur D, Vigier JF, Popa K, Walter O, Dieste O, Varga Z, Beck A, Vitova T, Scheinost AC, Martin PM. Charge Distribution in U 1-xCe xO 2+y Nanoparticles. Inorg Chem 2021; 60:14550-14556. [PMID: 34524816 DOI: 10.1021/acs.inorgchem.1c01071] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In view of safe management of the nuclear wastes, a sound knowledge of the atomic-scale properties of U1-xMxO2+y nanoparticles is essential. In particular, their cation valences and oxygen stoichiometries are of great interest as these properties drive their diffusion and migration behaviors into the environment. Here, we present an in-depth study of U1-xCexO2+y, over the full compositional domain, by combining X-ray diffraction and high-energy resolution fluorescence detection X-ray absorption near-edge structure. We show, on one hand, the coexistence of UIV, UV, and UVI and, on the other hand, that the fluorite structure is maintained despite this charge distribution.
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Affiliation(s)
- Damien Prieur
- Institute of Resource Ecology, Helmholtz Zentrum Dresden-Rossendorf (HZDR), P.O. Box 510119, 01314 Dresden, Germany.,The Rossendorf Beamline at ESRF-The European Synchrotron, CS40220, 38043 Grenoble Cedex 9, France
| | - Jean-François Vigier
- Joint Research Centre, European Commission, P.O. Box 2340, 76125 Karlsruhe, Germany
| | - Karin Popa
- Joint Research Centre, European Commission, P.O. Box 2340, 76125 Karlsruhe, Germany
| | - Olaf Walter
- Joint Research Centre, European Commission, P.O. Box 2340, 76125 Karlsruhe, Germany
| | - Oliver Dieste
- Joint Research Centre, European Commission, P.O. Box 2340, 76125 Karlsruhe, Germany
| | - Zsolt Varga
- Joint Research Centre, European Commission, P.O. Box 2340, 76125 Karlsruhe, Germany
| | - Aaron Beck
- 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
| | - Andreas C Scheinost
- Institute of Resource Ecology, Helmholtz Zentrum Dresden-Rossendorf (HZDR), P.O. Box 510119, 01314 Dresden, Germany.,The Rossendorf Beamline at ESRF-The European Synchrotron, CS40220, 38043 Grenoble Cedex 9, France
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35
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Adsorption-reduction strategy of U(VI) on NZVI-supported zeolite composites via batch, visual and XPS techniques. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2021.116719] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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36
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Lv SY, Li M, Wu XY, Zhang XW, Hua YL, Bi L, Fang Q, Cai T. A non-polluting method for rapidly purifying uranium-containing wastewater and efficiently recovering uranium through electrochemical mineralization and oxidative roasting. JOURNAL OF HAZARDOUS MATERIALS 2021; 416:125885. [PMID: 34492823 DOI: 10.1016/j.jhazmat.2021.125885] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 03/26/2021] [Accepted: 04/09/2021] [Indexed: 06/13/2023]
Abstract
Iron-based materials have been widely used for treating uranium-containing wastewater. However, the iron-uranium solids originating by treating radioactive water through pollutant transfer methods has become a new uncontrolled source of persistent radioactive pollution. The safe disposal of such hazardous waste is not yet well-resolved. The electrochemical mineralization method was developed to rapidly purify uranium-containing wastewater through lattice doping in magnetite and recover uranium without generating any pollutants. An unexpected isolation of U3O8 from uranium-doped magnetite was discovered through in-situ XRD with a temperature variation from 300 °C to 700 °C. Through HRTEM and DFT calculation, it was confirmed that the destruction of the inverse spinel crystal structure during the gradual transformation of magnetite into γ-Fe2O3 and α-Fe2O3 promoted the migration, aggregation, and isolation of uranium atoms. Uniquely generated U3O8 and Fe2O3 were easily separated and over 80% uranium and 99.5% iron could be recovered. These results demonstrate a new strategy for uranium utilization and the environmentally friendly treatment of uranium-containing wastewater.
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Affiliation(s)
- Shao-Yan Lv
- School of Resource & Environment and Safety Engineering, University of South China, Hengyang 421001, China
| | - Mi Li
- School of Resource & Environment and Safety Engineering, University of South China, Hengyang 421001, China; Hengyang Key Laboratory of Soil Pollution Control and Remediation, University of South China, Hengyang 421001, China.
| | - Xiao-Yan Wu
- School of Resource & Environment and Safety Engineering, University of South China, Hengyang 421001, China
| | - Xiao-Wen Zhang
- School of Resource & Environment and Safety Engineering, University of South China, Hengyang 421001, China
| | - Yi-Long Hua
- School of Resource & Environment and Safety Engineering, University of South China, Hengyang 421001, China
| | - Lei Bi
- School of Resource & Environment and Safety Engineering, University of South China, Hengyang 421001, China
| | - Qi Fang
- School of Resource & Environment and Safety Engineering, University of South China, Hengyang 421001, China
| | - Tao Cai
- School of Resource & Environment and Safety Engineering, University of South China, Hengyang 421001, China
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37
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Townsend LT, Morris K, Harrison R, Schacherl B, Vitova T, Kovarik L, Pearce CI, Mosselmans JFW, Shaw S. Sulfidation of magnetite with incorporated uranium. CHEMOSPHERE 2021; 276:130117. [PMID: 34088087 DOI: 10.1016/j.chemosphere.2021.130117] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 02/03/2021] [Accepted: 02/24/2021] [Indexed: 06/12/2023]
Abstract
Uranium (U) is a radionuclide of key environmental interest due its abundance by mass within radioactive waste and presence in contaminated land scenarios. Ubiquitously present iron (oxyhydr)oxide mineral phases, such as (nano)magnetite, have been identified as candidates for immobilisation of U via incorporation into the mineral structure. Studies of how biogeochemical processes, such as sulfidation from the presence of sulfate-reducing bacteria, may affect iron (oxyhydr)oxides and impact radionuclide mobility are important in order to underpin geological disposal of radioactive waste and manage radioactively contaminated land. Here, this study utilised a highly controlled abiotic method for sulfidation of U(V) incorporated into nanomagnetite to determine the fate and speciation of U. Upon sulfidation, transient release of U into solution occurred (∼8.6% total U) for up to 3 days, despite the highly reducing conditions. As the system evolved, lepidocrocite was observed to form over a period of days to weeks. After 10 months, XAS and geochemical data showed all U was partitioned to the solid phase, as both nanoparticulate uraninite (U(IV)O2) and a percentage of retained U(V). Further EXAFS analysis showed incorporation of the residual U(V) fraction into an iron (oxyhydr)oxide mineral phase, likely nanomagnetite or lepidocrocite. Overall, these results provide new insights into the stability of U(V) incorporated iron (oxyhydr)oxides during sulfidation, confirming the longer term retention of U in the solid phase under complex, environmentally relevant conditions.
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Affiliation(s)
- Luke T Townsend
- Research Centre for Radwaste Disposal and Williamson Research Centre for Molecular Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, Manchester, M13 9PL, UK
| | - Katherine Morris
- Research Centre for Radwaste Disposal and Williamson Research Centre for Molecular Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, Manchester, M13 9PL, UK
| | - Robert Harrison
- School of Mechanical, Aerospace & Civil Engineering, University of Manchester, Manchester, M13 9PL, UK
| | - Bianca Schacherl
- Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal (KIT-INE), P.O. Box 3640, D-76021, Karlsruhe, Germany
| | - Tonya Vitova
- Karlsruhe Institute of Technology, Institute for Nuclear Waste Disposal (KIT-INE), P.O. Box 3640, D-76021, Karlsruhe, Germany
| | - Libor Kovarik
- Pacific Northwest National Laboratory, Richland, WA, 99352, United States
| | - Carolyn I Pearce
- Pacific Northwest National Laboratory, Richland, WA, 99352, United States
| | - J Frederick W Mosselmans
- Diamond Light Source Ltd., Diamond House, Harwell Science and Innovation Campus, Didcot, Oxfordshire, OX11 0DE, UK
| | - Samuel Shaw
- Research Centre for Radwaste Disposal and Williamson Research Centre for Molecular Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, Manchester, M13 9PL, UK.
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38
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Zhang L, Chen Y, Xia Q, Kemner KM, Shen Y, O'Loughlin EJ, Pan Z, Wang Q, Huang Y, Dong H, Boyanov MI. Combined Effects of Fe(III)-Bearing Clay Minerals and Organic Ligands on U(VI) Bioreduction and U(IV) Speciation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:5929-5938. [PMID: 33822593 DOI: 10.1021/acs.est.0c08645] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Reduction of U(VI) to U(IV) drastically reduces its solubility and has been proposed as a method for remediation of uranium contamination. However, much is still unknown about the kinetics, mechanisms, and products of U(VI) bioreduction in complex systems. In this study, U(VI) bioreduction experiments were conducted with Shewanella putrefaciens strain CN32 in the presence of clay minerals and two organic ligands: citrate and EDTA. In reactors with U and Fe(III)-clay minerals, the rate of U(VI) bioreduction was enhanced due to the presence of ligands, likely because soluble Fe3+- and Fe2+-ligand complexes served as electron shuttles. In the presence of citrate, bioreduced U(IV) formed a soluble U(IV)-citrate complex in experiments with either Fe-rich or Fe-poor clay mineral. In the presence of EDTA, U(IV) occurred as a soluble U(IV)-EDTA complex in Fe-poor montmorillonite experiments. However, U(IV) remained associated with the solid phase in Fe-rich nontronite experiments through the formation of a ternary U(IV)-EDTA-surface complex, as suggested by the EXAFS analysis. Our study indicates that organic ligands and Fe(III)-bearing clays can significantly affect the microbial reduction of U(VI) and the stability of the resulting U(IV) phase.
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Affiliation(s)
- Limin Zhang
- State Key Laboratory of Biology and Environmental Geology, China University of Geosciences, Beijing 100083, China
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Yu Chen
- State Key Laboratory of Biology and Environmental Geology, China University of Geosciences, Beijing 100083, China
| | - Qingyin Xia
- State Key Laboratory of Biology and Environmental Geology, China University of Geosciences, Beijing 100083, China
| | - Kenneth M Kemner
- Biosciences Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Yanghao Shen
- Biosciences Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Edward J O'Loughlin
- Biosciences Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Zezhen Pan
- Environmental Microbiology Laboratory Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Qihuang Wang
- Department of Environmental Science and Engineering, Fudan University, Shanghai 200438, China
| | - Ying Huang
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing 100101, China
| | - Hailiang Dong
- State Key Laboratory of Biology and Environmental Geology, China University of Geosciences, Beijing 100083, China
| | - Maxim I Boyanov
- Biosciences Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
- Bulgarian Academy of Sciences, Institute of Chemical Engineering, Sofia 1113, Bulgaria
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39
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Molinas M, Faizova R, Brown A, Galanzew J, Schacherl B, Bartova B, Meibom KL, Vitova T, Mazzanti M, Bernier-Latmani R. Biological Reduction of a U(V)-Organic Ligand Complex. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2021; 55:4753-4761. [PMID: 33705103 PMCID: PMC8154365 DOI: 10.1021/acs.est.0c06633] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 02/24/2021] [Accepted: 03/01/2021] [Indexed: 05/20/2023]
Abstract
Metal-reducing microorganisms such as Shewanella oneidensis MR-1 reduce highly soluble species of hexavalent uranyl (U(VI)) to less mobile tetravalent uranium (U(IV)) compounds. The biologically mediated immobilization of U(VI) is being considered for the remediation of U contamination. However, the mechanistic underpinnings of biological U(VI) reduction remain unresolved. It has become clear that a first electron transfer occurs to form pentavalent (U(V)) intermediates, but it has not been definitively established whether a second one-electron transfer can occur or if disproportionation of U(V) is required. Here, we utilize the unusual properties of dpaea2- ((dpaeaH2═bis(pyridyl-6-methyl-2-carboxylate)-ethylamine)), a ligand forming a stable soluble aqueous complex with U(V), and investigate the reduction of U(VI)-dpaea and U(V)-dpaea by S. oneidensis MR-1. We establish U speciation through time by separating U(VI) from U(IV) by ion exchange chromatography and characterize the reaction end-products using U M4-edge high resolution X-ray absorption near-edge structure (HR-XANES) spectroscopy. We document the reduction of solid phase U(VI)-dpaea to aqueous U(V)-dpaea but, most importantly, demonstrate that of U(V)-dpaea to U(IV). This work establishes the potential for biological reduction of U(V) bound to a stabilizing ligand. Thus, further work is warranted to investigate the possible persistence of U(V)-organic complexes followed by their bioreduction in environmental systems.
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Affiliation(s)
- Margaux Molinas
- Environmental
Microbiology Laboratory, and Group of Coordination Chemistry, Ecole Polytechnique Fédérale de Lausanne
(EPFL), Lausanne 1015, Switzerland
| | - Radmila Faizova
- Environmental
Microbiology Laboratory, and Group of Coordination Chemistry, Ecole Polytechnique Fédérale de Lausanne
(EPFL), Lausanne 1015, Switzerland
| | - Ashley Brown
- Environmental
Microbiology Laboratory, and Group of Coordination Chemistry, Ecole Polytechnique Fédérale de Lausanne
(EPFL), Lausanne 1015, Switzerland
| | - Jurij Galanzew
- Karlsruhe
Institute of Technology (KIT), Institute for Nuclear Waste Disposal
(INE), P.O. 3640, D-76021Karlsruhe, Germany
| | - Bianca Schacherl
- Karlsruhe
Institute of Technology (KIT), Institute for Nuclear Waste Disposal
(INE), P.O. 3640, D-76021Karlsruhe, Germany
| | - Barbora Bartova
- Environmental
Microbiology Laboratory, and Group of Coordination Chemistry, Ecole Polytechnique Fédérale de Lausanne
(EPFL), Lausanne 1015, Switzerland
| | - Karin L. Meibom
- Environmental
Microbiology Laboratory, and Group of Coordination Chemistry, Ecole Polytechnique Fédérale de Lausanne
(EPFL), Lausanne 1015, Switzerland
| | - Tonya Vitova
- Karlsruhe
Institute of Technology (KIT), Institute for Nuclear Waste Disposal
(INE), P.O. 3640, D-76021Karlsruhe, Germany
| | - Marinella Mazzanti
- Environmental
Microbiology Laboratory, and Group of Coordination Chemistry, Ecole Polytechnique Fédérale de Lausanne
(EPFL), Lausanne 1015, Switzerland
| | - Rizlan Bernier-Latmani
- Environmental
Microbiology Laboratory, and Group of Coordination Chemistry, Ecole Polytechnique Fédérale de Lausanne
(EPFL), Lausanne 1015, Switzerland
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40
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Gerber E, Romanchuk AY, Weiss S, Bauters S, Schacherl B, Vitova T, Hübner R, Shams Aldin Azzam S, Detollenaere D, Banerjee D, Butorin SM, Kalmykov SN, Kvashnina KO. Insight into the structure–property relationship of UO 2 nanoparticles. Inorg Chem Front 2021. [DOI: 10.1039/d0qi01140a] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We show that the structural and electronic properties of UO2 NPs (2–3 nm) are similar to those of bulk UO2 under inert conditions, with U(iv) as the dominating oxidation state, though NPs oxidize with time and under the X-ray beam.
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41
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Hu SX, Zhang P, Lu E, Zhang P. Decisive Role of 5f-Orbital Covalence in the Structure and Stability of Pentavalent Transuranic Oxo [M 6O 8] Clusters. Inorg Chem 2020; 59:18068-18077. [PMID: 33287539 DOI: 10.1021/acs.inorgchem.0c02539] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Actinide metal oxo clusters are of vital importance in actinide chemistry, as well as in environmental and materials sciences. They are ubiquitous in both aqueous and nonaqueous phases and play key roles in nuclear materials (e.g., nuclear fuel) and nuclear waste management. Despite their importance, our structural understanding of the actinide metal oxo clusters, particularly the transuranic ones, is very limited because of experimental challenges such as high radioactivity. Herein we report a systematic theoretical study on the structures and stabilities of seven actinide metal oxo-hydroxo clusters [AnIV6O4(OH)4L12] (1-An; An = Th-Cm; L = O2CH-) along with their group 4 (Ti, Zr, Hf, Rf) and lanthanide (Ce) counterparts [MIV6O4(OH)4L12] (1-M). The work shows the Td-symmetric structures of all of the 1-An/M clusters and suggests the positions of the -OH functional groups, which are experimentally challenging to determine. Furthermore, by removing six electrons from 1-An, we found that oxidation could happen on the AnIV metal ions, producing [AnV6O4(OH)4L12]6+ (2-An; An = Pa, U, Np), or on the O2- and OH- ligands, producing [AnIV6(O•-)4(OH•)2(OH)2L12]6+ (3-An; An = Pu, Am, Cm). On the basis of 2-An, we constructed a series of tetravalent and pentavalent actinide metal oxo clusters [AnIV6O14]4- (4-An) and [AnV6O14]2+ (5-An), which proves the feasibility of the highly important pentavalent actinyl clusters, demonstrates the f orbital's structure-directing role in the formation of linear [O≡AnV═O]+ actinyl ions, and expands the concept of actinyl-actinyl interaction into pentavalent transuranic actinyl clusters.
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Affiliation(s)
- Shu-Xian Hu
- School of Mathematics and Physics, University of Science and Technology Beijing, Beijing 100083, China.,Beijing Computational Science Research Center, Beijing 100193, China
| | - Peng Zhang
- Beijing Computational Science Research Center, Beijing 100193, China
| | - Erli Lu
- School of Natural and Environmental Sciences, Newcastle University, Newcastle NE1 7RU, U.K
| | - Ping Zhang
- Laboratory of Computational Physics, Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
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42
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Liu P, Yu Q, Zhang X, Chen J, Xue Y, Ma F. Removal of U(VI) from aqueous solution using AO-artificial zeolite. J Radioanal Nucl Chem 2020. [DOI: 10.1007/s10967-020-07485-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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43
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Dong Z, Zhang Z, Zhou R, Dong Y, Wei Y, Zheng Z, Wang Y, Dai Y, Cao X, Liu Y. Facile construction of Fe, N and P co-doped carbon spheres by carbothermal strategy for the adsorption and reduction of U(vi). RSC Adv 2020; 10:34859-34868. [PMID: 35514430 PMCID: PMC9056867 DOI: 10.1039/d0ra06252a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2020] [Accepted: 08/17/2020] [Indexed: 11/28/2022] Open
Abstract
In this work, nitrogen and phosphorus co-doped magnetic carbon spheres encapsulating well-dispersed active Fe nanocrystals (Fe/P-CN) were fabricated via a simple copolymer pyrolysis strategy. Benefiting from heteroatoms doping, Fe/P-CN could primarily adsorb soluble U(vi) ions through abundant functional groups, and subsequently, the adsorbed U(vi) could be reduced to insoluble U(iv) by Fe nanocrystals. Fe/P-CN pyrolyzed at 800 °C (Fe/P-CN-800) exhibited excellent U(vi) removal capacity of 306.76 mg g−1, surpassing nitrogen and phosphorus co-doped carbon spheres and nano zero-valent iron. In addition, the magnetic separation and thermal reactivation properties endow Fe/P-CN-800 with excellent reusability. This research, especially, provides a promising synergistic adsorption and reduction strategy to effectively remove U(vi) using heteroatom-doped composites. The constructed novel magnetic carbon sphere co-doped by N, P, Fe (Fe/P-CN) exhibits high U(vi) removal efficiency, excellent magnetic separation and reusability, evidencing the potential practical applications in environmental remediation.![]()
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Affiliation(s)
- Zhimin Dong
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology Nanchang Jiangxi 330013 P. R. China
| | - Zhibin Zhang
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology Nanchang Jiangxi 330013 P. R. China
| | - Runze Zhou
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology Nanchang Jiangxi 330013 P. R. China
| | - Yayu Dong
- MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage, School of Chemistry and Chemical Engineering, Harbin Institute of Technology Harbin 150001 P. R. China
| | - Yuanyuan Wei
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology Nanchang Jiangxi 330013 P. R. China
| | - Zhijian Zheng
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology Nanchang Jiangxi 330013 P. R. China
| | - Youqun Wang
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology Nanchang Jiangxi 330013 P. R. China
| | - Ying Dai
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology Nanchang Jiangxi 330013 P. R. China
| | - Xiaohong Cao
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology Nanchang Jiangxi 330013 P. R. China
| | - Yunhai Liu
- State Key Laboratory of Nuclear Resources and Environment, East China University of Technology Nanchang Jiangxi 330013 P. R. China
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44
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Fuller AJ, Leary P, Gray ND, Davies HS, Mosselmans JFW, Cox F, Robinson CH, Pittman JK, McCann CM, Muir M, Graham MC, Utsunomiya S, Bower WR, Morris K, Shaw S, Bots P, Livens FR, Law GTW. Organic complexation of U(VI) in reducing soils at a natural analogue site: Implications for uranium transport. CHEMOSPHERE 2020; 254:126859. [PMID: 32957279 DOI: 10.1016/j.chemosphere.2020.126859] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2020] [Revised: 04/07/2020] [Accepted: 04/19/2020] [Indexed: 06/11/2023]
Abstract
Understanding the long-term fate, stability, and bioavailability of uranium (U) in the environment is important for the management of nuclear legacy sites and radioactive wastes. Analysis of U behavior at natural analogue sites permits evaluation of U biogeochemistry under conditions more representative of long-term equilibrium. Here, we have used bulk geochemical and microbial community analysis of soils, coupled with X-ray absorption spectroscopy and μ-focus X-ray fluorescence mapping, to gain a mechanistic understanding of the fate of U transported into an organic-rich soil from a pitchblende vein at the UK Needle's Eye Natural Analogue site. U is highly enriched in the Needle's Eye soils (∼1600 mg kg-1). We show that this enrichment is largely controlled by U(VI) complexation with soil organic matter and not U(VI) bioreduction. Instead, organic-associated U(VI) seems to remain stable under microbially-mediated Fe(III)-reducing conditions. U(IV) (as non-crystalline U(IV)) was only observed at greater depths at the site (>25 cm); the soil here was comparatively mineral-rich, organic-poor, and sulfate-reducing/methanogenic. Furthermore, nanocrystalline UO2, an alternative product of U(VI) reduction in soils, was not observed at the site, and U did not appear to be associated with Fe-bearing minerals. Organic-rich soils appear to have the potential to impede U groundwater transport, irrespective of ambient redox conditions.
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Affiliation(s)
- Adam J Fuller
- Centre for Radiochemistry Research, Department of Chemistry, The University of Manchester, Manchester, M13 9PL, UK
| | - Peter Leary
- School of Natural and Environmental Sciences, Newcastle University, Newcastle, NE1 7RU, UK
| | - Neil D Gray
- School of Natural and Environmental Sciences, Newcastle University, Newcastle, NE1 7RU, UK
| | - Helena S Davies
- Research Centre for Radwaste Disposal, and Williamson Centre for Molecular Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, Manchester, M13 9PL, UK
| | | | - Filipa Cox
- Research Centre for Radwaste Disposal, and Williamson Centre for Molecular Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, Manchester, M13 9PL, UK
| | - Clare H Robinson
- Research Centre for Radwaste Disposal, and Williamson Centre for Molecular Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, Manchester, M13 9PL, UK
| | - Jon K Pittman
- Research Centre for Radwaste Disposal, and Williamson Centre for Molecular Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, Manchester, M13 9PL, UK
| | - Clare M McCann
- School of Natural and Environmental Sciences, Newcastle University, Newcastle, NE1 7RU, UK
| | - Michael Muir
- School of Geoscience, University of Edinburgh, Edinburgh, EH9 3FF, UK
| | - Margaret C Graham
- School of Geoscience, University of Edinburgh, Edinburgh, EH9 3FF, UK
| | - Satoshi Utsunomiya
- School of Chemistry, Kyushu University, 744 Motooka, Nishi-ku, Fukuoka, 819-0395, Japan
| | - William R Bower
- Centre for Radiochemistry Research, Department of Chemistry, The University of Manchester, Manchester, M13 9PL, UK; Radiochemistry Unit, Department of Chemistry, The University of Helsinki, 00014, Finland
| | - Katherine Morris
- Research Centre for Radwaste Disposal, and Williamson Centre for Molecular Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, Manchester, M13 9PL, UK
| | - Samuel Shaw
- Research Centre for Radwaste Disposal, and Williamson Centre for Molecular Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, Manchester, M13 9PL, UK
| | - Pieter Bots
- Research Centre for Radwaste Disposal, and Williamson Centre for Molecular Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, Manchester, M13 9PL, UK
| | - Francis R Livens
- Centre for Radiochemistry Research, Department of Chemistry, The University of Manchester, Manchester, M13 9PL, UK; Research Centre for Radwaste Disposal, and Williamson Centre for Molecular Environmental Science, Department of Earth and Environmental Sciences, The University of Manchester, Manchester, M13 9PL, UK
| | - Gareth T W Law
- Centre for Radiochemistry Research, Department of Chemistry, The University of Manchester, Manchester, M13 9PL, UK; Radiochemistry Unit, Department of Chemistry, The University of Helsinki, 00014, Finland.
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45
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Dai Z, Sun Y, Zhang H, Ding D, Li L. Photocatalytic reduction of U(VI) in wastewater by mGO/g-C 3N 4 nanocomposite under visible LED light irradiation. CHEMOSPHERE 2020; 254:126671. [PMID: 32334243 DOI: 10.1016/j.chemosphere.2020.126671] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 03/17/2020] [Accepted: 03/31/2020] [Indexed: 06/11/2023]
Abstract
Efficient elimination of U(VI) from uranium wastewater is an urgent task for sustainable nuclear energy and environmental protection. In this study, magnetic graphene oxide decorated graphitic carbon nitride (mGO/g-C3N4) nanocomposite was prepared and used for photocatalytic reduction of U(VI) in wastewater under visible LED light irradiation for the first time. The batch experiments indicated that the mGO/g-C3N4 (mGCN) nanocomposite could efficiently reduce U(VI) under visible LED light, and a high U(VI) extraction capacity of 2880.6 mg/g was obtained with an extraction efficiency of 96.02%. The transmission electron microscopy (TEM) elemental mapping, X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) analyses demonstrated that the soluble U(VI) was immobilized by transforming it to metastudtite ((UO2)O2·2H2O) by mGCN nanocomposite under visible LED light irradiation. This work indicated that the mGCN is a promising visible light catalyst for treatment of uranium wastewater.
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Affiliation(s)
- Zhongran Dai
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, 421001, China
| | - Yusu Sun
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, 421001, China
| | - Hui Zhang
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, 421001, China
| | - Dexin Ding
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, 421001, China.
| | - Le Li
- Key Discipline Laboratory for National Defense for Biotechnology in Uranium Mining and Hydrometallurgy, University of South China, Hengyang, 421001, China
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46
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Romanchuk AY, Vlasova IE, Kalmykov SN. Speciation of Uranium and Plutonium From Nuclear Legacy Sites to the Environment: A Mini Review. Front Chem 2020; 8:630. [PMID: 32903456 PMCID: PMC7434977 DOI: 10.3389/fchem.2020.00630] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2020] [Accepted: 06/17/2020] [Indexed: 12/02/2022] Open
Abstract
The row of 15 chemical elements from Ac to Lr with atomic numbers from 89 to 103 are known as the actinides, which are all radioactive. Among them, uranium and plutonium are the most important as they are used in the nuclear fuel cycle and nuclear weapon production. Since the beginning of national nuclear programs and nuclear tests, many radioactively contaminated nuclear legacy sites, have been formed. This mini review covers the latest experimental, modeling, and case studies of plutonium and uranium migration in the environment, including the speciation of these elements and the chemical reactions that control their migration pathways.
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Affiliation(s)
| | | | - Stepan N. Kalmykov
- Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
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47
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Pan Z, Bártová B, LaGrange T, Butorin SM, Hyatt NC, Stennett MC, Kvashnina KO, Bernier-Latmani R. Nanoscale mechanism of UO 2 formation through uranium reduction by magnetite. Nat Commun 2020; 11:4001. [PMID: 32778661 PMCID: PMC7417540 DOI: 10.1038/s41467-020-17795-0] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2019] [Accepted: 07/14/2020] [Indexed: 11/10/2022] Open
Abstract
Uranium (U) is a ubiquitous element in the Earth's crust at ~2 ppm. In anoxic environments, soluble hexavalent uranium (U(VI)) is reduced and immobilized. The underlying reduction mechanism is unknown but likely of critical importance to explain the geochemical behavior of U. Here, we tackle the mechanism of reduction of U(VI) by the mixed-valence iron oxide, magnetite. Through high-end spectroscopic and microscopic tools, we demonstrate that the reduction proceeds first through surface-associated U(VI) to form pentavalent U, U(V). U(V) persists on the surface of magnetite and is further reduced to tetravalent UO2 as nanocrystals (~1-2 nm) with random orientations inside nanowires. Through nanoparticle re-orientation and coalescence, the nanowires collapse into ordered UO2 nanoclusters. This work provides evidence for a transient U nanowire structure that may have implications for uranium isotope fractionation as well as for the molecular-scale understanding of nuclear waste temporal evolution and the reductive remediation of uranium contamination.
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Affiliation(s)
- Zezhen Pan
- Environmental Microbiology Laboratory, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
| | - Barbora Bártová
- Environmental Microbiology Laboratory, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
- Interdisciplinary Center for Electron Microscopy, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
| | - Thomas LaGrange
- Laboratory for Ultrafast Microscopy and Electron Scattering, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
| | - Sergei M Butorin
- Molecular and Condensed Matter Physics, Department of Physics and Astronomy, Uppsala University, Box 516, SE-751 20, Uppsala, Sweden
| | | | | | - Kristina O Kvashnina
- The Rossendorf Beamline at ESRF - The European Synchrotron, CS40220, 38043, Grenoble, Cedex 9, France
- Helmholtz Zentrum Dresden-Rossendorf (HZDR), Institute of Resource Ecology, PO Box 510119, 01314, Dresden, Germany
| | - Rizlan Bernier-Latmani
- Environmental Microbiology Laboratory, École Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland.
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48
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Dewey C, Sokaras D, Kroll T, Bargar JR, Fendorf S. Calcium-Uranyl-Carbonato Species Kinetically Limit U(VI) Reduction by Fe(II) and Lead to U(V)-Bearing Ferrihydrite. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2020; 54:6021-6030. [PMID: 32315524 DOI: 10.1021/acs.est.9b05870] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Reaction conditions and mechanisms promoting or inhibiting U reduction exert a central control on U solubility and, therefore, U transport and its associated risks. Here, we vary and track common aqueous uranium species to show that a kinetic restriction inhibits homogeneous reduction of the calcium-uranyl-carbonato species (CaUO2(CO3)32- and Ca2UO2(CO3)3) by Fe(II)(aq), while ferrihydrite surface-catalyzed reduction of all aqueous uranyl by Fe(II) proceeds. Using U L3 high energy resolution fluorescence detection (HERFD) X-ray absorption near edge structure (XANES) spectroscopy, U L3 extended X-ray absorption fine structure (EXAFS) spectroscopy, and transmission electron microscopy (TEM), we also show that U(V) is generated and incorporated into ferrihydrite formed from homogeneous U(VI) reduction by Fe(II)(aq). Through elucidation of the mechanisms that inhibit reduction of the calcium-uranyl-carbonato species and promote stabilization of U(V), we advance our understanding of the controls on U solubility and thus improve prediction of U transport in surface and subsurface systems.
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Affiliation(s)
- Christian Dewey
- Earth System Science Department, Stanford University, Stanford, California 94305, United States
| | - Dimosthenis Sokaras
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - Thomas Kroll
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - John R Bargar
- SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, United States
| | - Scott Fendorf
- Earth System Science Department, Stanford University, Stanford, California 94305, United States
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49
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Xie Y, Fang Q, Li M, Wang S, Luo Y, Wu X, Lv J, Tan W, Wang H, Tan K. Low concentration of Fe(II) to enhance the precipitation of U(VI) under neutral oxygen-rich conditions. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 711:134827. [PMID: 32000325 DOI: 10.1016/j.scitotenv.2019.134827] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2019] [Revised: 09/19/2019] [Accepted: 10/03/2019] [Indexed: 06/10/2023]
Abstract
Immobilization of U(VI) by naturally ubiquitous ferrous ions (Fe(II)) has been considered as an efficient and ecofriendly method to retard the migration of aqueous U(VI) at many nuclear sites and surface environments. In this study, we conducted Fe-U coprecipitation experiments to investigate the mechanism and stability of uranium (U) precipitation induced by a small quantity of Fe(II) under oxygen-rich conditions. The experimental results suggest that the sedimentation rates of U(VI) by Fe(II) under neutral oxygen-rich conditions are more than 96%, which are about 36% higher than those without Fe(II) and 16% higher than those under oxygen-free conditions. The Fe-U coprecipitates were observed to remain stable under slightly acidic to neutral and oxygen-rich conditions. Fe(II) primarily settles down as low-crystalline iron oxide hydroxide. U(VI) mainly precipitates as three forms: 16-20% of U forms uranyl hydroxide and metaschoepite, which is absorbed on the surface of the solids; 52-56% of U is absorbed as discrete uranyl phases at the internal pores of iron oxide hydroxide; and 27-29% of U is probably incorporated into the FeO(OH) structure as U(V) and U(VI). The U(V) generated via one-electron reduction is somewhat resistant to the oxidation of O2 and the acid dissolution. In addition, nearly 70% of U and only about 15% of Fe could be extracted in 24 h by a hydrochloric acid solution with the H+ concentration ([H+]) of 0.01 M, revealing that U(VI) immobilization by low concentration of Fe(II) combined with O2 has potential applications in the separation and recycling of aqueous uranium.
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Affiliation(s)
- Yanpei Xie
- School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, PR China
| | - Qi Fang
- School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, PR China; Hengyang Key Laboratory of Soil Pollution Control and Remediation, University of South China, Hengyang 421001, PR China.
| | - Mi Li
- School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, PR China; Hengyang Key Laboratory of Soil Pollution Control and Remediation, University of South China, Hengyang 421001, PR China
| | - Sainan Wang
- School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, PR China
| | - Yingfeng Luo
- School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, PR China
| | - Xiaoyan Wu
- School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, PR China; Hengyang Key Laboratory of Soil Pollution Control and Remediation, University of South China, Hengyang 421001, PR China
| | - Junwen Lv
- School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, PR China; Hengyang Key Laboratory of Soil Pollution Control and Remediation, University of South China, Hengyang 421001, PR China
| | - Wenfa Tan
- School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, PR China; Hengyang Key Laboratory of Soil Pollution Control and Remediation, University of South China, Hengyang 421001, PR China
| | - Hongqiang Wang
- School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, PR China; Hengyang Key Laboratory of Soil Pollution Control and Remediation, University of South China, Hengyang 421001, PR China
| | - Kaixuan Tan
- School of Resource Environment and Safety Engineering, University of South China, Hengyang 421001, PR China
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50
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Morelová N, Finck N, Lützenkirchen J, Schild D, Dardenne K, Geckeis H. Sorption of americium / europium onto magnetite under saline conditions: Batch experiments, surface complexation modelling and X-ray absorption spectroscopy study. J Colloid Interface Sci 2020; 561:708-718. [PMID: 31767395 DOI: 10.1016/j.jcis.2019.11.047] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 11/12/2019] [Accepted: 11/13/2019] [Indexed: 10/25/2022]
Abstract
HYPOTHESIS This study investigates the adsorption of americium and its chemical analogue europium on magnetite, which is expected to form as a major long-term steel canister corrosion product under anoxic and highly saline conditions. EXPERIMENTS The sorption of europium on magnetite (solid/liquid ratio = 0.5 g/L) was investigated batch wise in NaCl brines with ionic strength I = 1 m, 3.5 m, and 6.67 m, as a function of pHm for two europium concentrations (6 × 10-10m, 1.2 × 10-5m). Information on the chemical nature of the surface species was obtained by X-ray absorption spectroscopy (XAS) at the americium L3-edge. FINDINGS Retention of europium by magnetite of >99.5% was found above pHm 6.4 for all ionic strengths for europium concentration of 6 × 10-10m. No ionic strength effect was observed in this pHm range. At 1.2 × 10-5m europium concentration, 95 ± 4% sorption was found above pHm 7.5 for I = 1 m and above pHm 8.0 for I = 3.5 m and 6.67 m. A small ionic strength effect was observed in this case. X-ray absorption spectroscopy (XAS) results are consistent with the batch sorption experiment outcomes, showing an insignificant effect of ionic strength on the pHm dependent sorption. Results from potentiometric titrations of the solid phase, batch sorption experiments and spectroscopy were interpreted consistently with a charge distribution multi-site (CD-MUSIC) triple layer surface complexation model assuming surface coordination of the metal ion via a tridentate binding mode.
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Affiliation(s)
- Nikoleta Morelová
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), P.O. 3640, D-76021 Karlsruhe, Germany.
| | - Nicolas Finck
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), P.O. 3640, D-76021 Karlsruhe, Germany.
| | - Johannes Lützenkirchen
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), P.O. 3640, D-76021 Karlsruhe, Germany.
| | - Dieter Schild
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), P.O. 3640, D-76021 Karlsruhe, Germany.
| | - Kathy Dardenne
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), P.O. 3640, D-76021 Karlsruhe, Germany.
| | - Horst Geckeis
- Institute for Nuclear Waste Disposal (INE), Karlsruhe Institute of Technology (KIT), P.O. 3640, D-76021 Karlsruhe, Germany.
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