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Lopez-Odriozola L, Shaw S, Abrahamsen-Mills L, Waters C, Natrajan LS. Identification and Quantification of Multiphase U(VI) Speciation on Gibbsite with pH Using TRLFS and PARAFAC of Excitation Emission Matrices. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:17916-17925. [PMID: 39315992 PMCID: PMC11466309 DOI: 10.1021/acs.est.4c06133] [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: 06/18/2024] [Revised: 09/16/2024] [Accepted: 09/17/2024] [Indexed: 09/25/2024]
Abstract
The significant abundance of uranium in radioactive waste inventories worldwide necessitates a thorough understanding of its behavior. In this work, the speciation of uranyl(VI), (UO22+) in a gibbsite system under ambient conditions has been determined as a function of pH by deconvolution and analysis of luminescence spectroscopic data. Uniquely, a combined experimental and statistical approach utilizing time-resolved luminescence spectroscopy and parallel factor analysis (PARAFAC) of excitation emission matrices has been successfully utilized to identify four separate luminescent U(VI) species in the uranyl-gibbsite system for the first time. The speciation of all luminescent U(VI) species in an environmentally relevant system over a pH range of 6-11 is discerned through the analysis of emission fingerprints at low temperature (20 K). Comparison of the deconvoluted luminescence spectra with mineral standards and geochemical models of the system allows the assignment of the luminescent chemical species as metaschoepite, Na-compreignacite, surface adsorbed ≡AlO2-UO2(OH) and ≡AlO2-UO2(CO3)24- complexes, with assignments supported by fitting of extended X-ray absorption fine structure data. The combined spectroscopic techniques in this study show that assignment and quantification of uranyl(VI) species in a sorption system over a large pH range can be accurately achieved using PARAFAC to deconvolute a three way emission spectroscopic data set.
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Affiliation(s)
- Laura Lopez-Odriozola
- Centre
for Radiochemistry Research, Department of Chemistry, The University of Manchester, Manchester M13 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, Manchester M13 9PL, U.K.
| | | | - Charlotte Waters
- 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, U.K.
| | - Louise S. Natrajan
- Centre
for Radiochemistry Research, Department of Chemistry, The University of Manchester, Manchester M13 9PL, U.K.
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2
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Neumann J, Carr AJ, Lessing J, Soderholm L, Catalano JG, Fenter P, Lee SS. Unraveling pH-Dependent Changes in Adsorption Structure of Uranyl on Alumina (012). J Phys Chem Lett 2024; 15:3493-3501. [PMID: 38517335 DOI: 10.1021/acs.jpclett.4c00498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2024]
Abstract
Mitigating uranium transport in groundwater is imperative for ensuring access to clean water across the globe. Here, in situ resonant anomalous X-ray reflectivity is used to investigate the adsorption of uranyl on alumina (012) in acidic aqueous solutions, representing typical UVI concentrations of contaminated water near mining sites. The analyses reveal that UVI adsorbs at two distinct heights of 2.4-3.2 and 5-5.3 Å from the surface terminal oxygens. The former is interpreted as the mixture of inner-sphere and outer-sphere complexes that adsorb closest to the surface. The latter is interpreted as an outer-sphere complex that shares one equatorial H2O with the terminal surface oxygen. With increasing pH, we observe an increasing prevalence of these outer-sphere complexes, indicating the enhanced role of the hydrogen bond that stabilizes adsorbed uranyl species. The presented work provides a molecular-scale understanding of sorption of uranyl on Al-based-oxide surfaces that has implications for environmental chemistry and materials science.
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Affiliation(s)
- Julia Neumann
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Amanda J Carr
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Jessica Lessing
- Institute of Resource Ecology, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany
| | - L Soderholm
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Jeffrey G Catalano
- Department of Earth, Environmental, and Planetary Sciences, Washington University in St. Louis, St. Louis, Missouri 63130, United States
| | - Paul Fenter
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
| | - Sang Soo Lee
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois 60439, United States
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3
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Xie X, Shi M, Zhou X, Li X, Jiang G, Du J. Adsorption and diffusion of actinyls on the basal gibbsite (001) surface: a theoretical perspective. Phys Chem Chem Phys 2023; 25:29680-29689. [PMID: 37882627 DOI: 10.1039/d3cp04088g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2023]
Abstract
Actinides are an important component of nuclear fuel for nuclear power and affect human health, and a key process in the transport of radionuclides in the environment is adsorption on mineral surfaces. In this work, we have used density functional theory (DFT) to investigate the microscopic adsorption and diffusion mechanisms of actinyls, U(V), U(VI), Np(V), Np(VI) Pu(V), and Pu(VI), on the gibbsite (001) surface. Actinyls(VI) are attached to the gibbsite surface through two An-Os bonds, which results in a bidentate inner sphere mode, while actinyls(V) favor a monodentate inner sphere adsorption mode with the gibbsite (001) surface. The solvent effects were considered through an explicit water cluster model. All the actinyls studied can be efficiently adsorbed on the gibbsite (001) surface with binding energies ranging from -113.9 kJ mol-1 to -341.2 kJ mol-1. Electronic structure analyses indicate that the cooperation of the An-Os bonds and hydrogen bonds leads to high adsorption stability of the actinyls with the gibbsite surface. The diffusion barriers of the actinyls on the gibbsite surface were determined, and the high energy barriers indicate that this type of gas-phase diffusion process is not likely to take place.
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Affiliation(s)
- Xingyu Xie
- College of Physics, Sichuan University, Chengdu 610064, China.
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
| | - Mingyang Shi
- College of Physics, Sichuan University, Chengdu 610064, China.
| | - Xuying Zhou
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
| | - Xianqiong Li
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
| | - Gang Jiang
- Institute of Atomic and Molecular Physics, Sichuan University, Chengdu 610065, China
| | - Jiguang Du
- College of Physics, Sichuan University, Chengdu 610064, China.
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4
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Chu ZQ, Zhu RY, Su J. Theoretical insights into the coordination structures, stabilities and electronic spectra of Cm 3+ species at the gibbsite-water interface: A computational study combing ab initio molecular dynamics and wave function theory. J Colloid Interface Sci 2023; 640:727-736. [PMID: 36898179 DOI: 10.1016/j.jcis.2023.02.157] [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: 01/07/2023] [Revised: 02/20/2023] [Accepted: 02/28/2023] [Indexed: 03/07/2023]
Abstract
The information of structure and stability of actinide species is key to understand the sorption mechanism of actinides at mineral-water interface. Such information is approximately derived from experimental spectroscopic measurements and needs to be accurately obtained by a direct atomic-scale modelling. Herein, systematic first-principles calculations and ab initio molecular dynamics (AIMD) simulations are carried out to study the coordination structures and absorption energies of Cm(III) surface complexes at gibbsite-water interface. Eleven representative complexing sites are investigated. The most stable Cm3+ sorption species are predicted to be a tridentate surface complex in weakly acidic/neutral solution condition and a bidentate one in the alkaline solution condition. Moreover, luminescence spectra of the Cm3+ aqua ion and the two surface complexes are predicted based on the high-accuracy ab initio wave function theory (WFT). The results give a gradually decreasing emission energy in good agreement with experimental observation of a red shift of peak maximum with pH increasing from 5 to 11. This work is a comprehensive computational study involving AIMD and ab initio WFT methods to gain the coordination structures, stabilities, and electronic spectra of actinide sorption species at the mineral-water interface, thus providing important theoretical support for geological disposal of actinide waste.
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Affiliation(s)
- Zhao-Qin Chu
- College of Chemistry, Sichuan University, Chengdu 610064, PR China
| | - Ru-Yu Zhu
- College of Chemistry, Sichuan University, Chengdu 610064, PR China
| | - Jing Su
- College of Chemistry, Sichuan University, Chengdu 610064, PR China.
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5
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Klaassen A, Liu F, Mugele F, Siretanu I. Correlation between Electrostatic and Hydration Forces on Silica and Gibbsite Surfaces: An Atomic Force Microscopy Study. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2022; 38:914-926. [PMID: 35025512 PMCID: PMC8793142 DOI: 10.1021/acs.langmuir.1c02077] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 12/29/2021] [Indexed: 06/14/2023]
Abstract
The balance between hydration and Derjaguin-Landau-Verwey-Overbeek (DLVO) forces at solid-liquid interfaces controls many processes, such as colloidal stability, wetting, electrochemistry, biomolecular self-assembly, and ion adsorption. Yet, the origin of molecular scale hydration forces and their relation to the surface charge density that controls the continuum scale electrostatic forces is poorly understood. We argue that these two types of forces are largely independent of each other. To support this hypothesis, we performed atomic force microscopy experiments using intermediate-sized tips that enable the simultaneous detection of DLVO and molecular scale oscillatory hydration forces at the interface between composite gibbsite:silica-aqueous electrolyte interfaces. We extract surface charge densities from forces measured at tip-sample separations of 1.5 nm and beyond using DLVO theory in combination with charge regulation boundary conditions for various pH values and salt concentrations. We simultaneously observe both colloidal scale DLVO forces and oscillatory hydration forces for an individual crystalline gibbsite particle and the underlying amorphous silica substrate for all fluid compositions investigated. While the diffuse layer charge varies with pH as expected, the oscillatory hydration forces are found to be largely independent of pH and salt concentration, supporting our hypothesis that both forces indeed have a very different origin. Oscillatory hydration forces are found to be distinctly more pronounced on gibbsite than on silica. We rationalize this observation based on the distribution of hydroxyl groups available for H bonding on the two distinct surfaces.
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Affiliation(s)
- Aram Klaassen
- Physics of Complex Fluids Group and
MESA+ Institute, Faculty of Science and Technology, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
| | - Fei Liu
- Physics of Complex Fluids Group and
MESA+ Institute, Faculty of Science and Technology, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
| | - Frieder Mugele
- Physics of Complex Fluids Group and
MESA+ Institute, Faculty of Science and Technology, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
| | - Igor Siretanu
- Physics of Complex Fluids Group and
MESA+ Institute, Faculty of Science and Technology, University of Twente, PO Box 217, 7500 AE Enschede, The Netherlands
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A Unified Mathematical Formalism for First to Third Order Dielectric Response of Matter: Application to Surface-Specific Two-Colour Vibrational Optical Spectroscopy. Symmetry (Basel) 2021. [DOI: 10.3390/sym13010153] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
To take advantage of the singular properties of matter, as well as to characterize it, we need to interact with it. The role of optical spectroscopies is to enable us to demonstrate the existence of physical objects by observing their response to light excitation. The ability of spectroscopy to reveal the structure and properties of matter then relies on mathematical functions called optical (or dielectric) response functions. Technically, these are tensor Green’s functions, and not scalar functions. The complexity of this tensor formalism sometimes leads to confusion within some articles and books. Here, we do clarify this formalism by introducing the physical foundations of linear and non-linear spectroscopies as simple and rigorous as possible. We dwell on both the mathematical and experimental aspects, examining extinction, infrared, Raman and sum-frequency generation spectroscopies. In this review, we thus give a personal presentation with the aim of offering the reader a coherent vision of linear and non-linear optics, and to remove the ambiguities that we have encountered in reference books and articles.
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7
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Yun J, Zhu C, Wang Q, Hu Q, Yang G. Strong affinity of mineral dusts for sulfur dioxide and catalytic mechanisms towards acid rain formation. CATAL COMMUN 2018. [DOI: 10.1016/j.catcom.2018.06.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022] Open
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8
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Conroy M, Soltis JA, Wittman RS, Smith FN, Chatterjee S, Zhang X, Ilton ES, Buck EC. Importance of interlayer H bonding structure to the stability of layered minerals. Sci Rep 2017; 7:13274. [PMID: 29038454 PMCID: PMC5643302 DOI: 10.1038/s41598-017-13452-7] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2017] [Accepted: 09/22/2017] [Indexed: 01/19/2023] Open
Abstract
Layered (oxy) hydroxide minerals often possess out-of-plane hydrogen atoms that form hydrogen bonding networks which stabilize the layered structure. However, less is known about how the ordering of these bonds affects the structural stability and solubility of these minerals. Here, we report a new strategy that uses the focused electron beam to probe the effect of differences in hydrogen bonding networks on mineral solubility. In this regard, the dissolution behavior of boehmite (γ-AlOOH) and gibbsite (γ-Al(OH)3) were compared and contrasted in real time via liquid cell electron microscopy. Under identical such conditions, 2D-nanosheets of boehmite (γ-AlOOH) exfoliated from the bulk and then rapidly dissolved, whereas gibbsite was stable. Further, substitution of only 1% Fe(III) for Al(III) in the structure of boehmite inhibited delamination and dissolution. Factors such as pH, radiolytic species, and knock on damage were systematically studied and eliminated as proximal causes for boehmite dissolution. Instead, the creation of electron/hole pairs was considered to be the mechanism that drove dissolution. The widely disparate behaviors of boehmite, gibbsite, and Fe-doped boehmite are discussed in the context of differences in the OH bond strengths, hydrogen bonding networks, and the presence or absence of electron/hole recombination centers.
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Affiliation(s)
- Michele Conroy
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Jennifer A Soltis
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Rick S Wittman
- National Security Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Frances N Smith
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Sayandev Chatterjee
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Xin Zhang
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Eugene S Ilton
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA
| | - Edgar C Buck
- Energy and Environment Directorate, Pacific Northwest National Laboratory, Richland, WA, 99354, USA.
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9
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Zhao HB, Zheng M, Schreckenbach G, Pan QJ. Interfacial Interaction of Titania Nanoparticles and Ligated Uranyl Species: A Relativistic DFT Investigation. Inorg Chem 2017; 56:2763-2776. [DOI: 10.1021/acs.inorgchem.6b02927] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hong-Bo Zhao
- Key Laboratory of
Functional Inorganic Material Chemistry of Education Ministry, School
of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China
| | - Ming Zheng
- Key Laboratory of
Functional Inorganic Material Chemistry of Education Ministry, School
of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China
| | - Georg Schreckenbach
- Department of Chemistry, University of Manitoba, Winnipeg R3T 2N2, MB, Canada
| | - Qing-Jiang Pan
- Key Laboratory of
Functional Inorganic Material Chemistry of Education Ministry, School
of Chemistry and Materials Science, Heilongjiang University, Harbin 150080, China
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10
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Makkos E, Kerridge A, Austin J, Kaltsoyannis N. Ionic adsorption on the brucite (0001) surface: A periodic electrostatic embedded cluster method study. J Chem Phys 2016; 145:204708. [DOI: 10.1063/1.4968035] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Eszter Makkos
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
| | - Andrew Kerridge
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
- Department of Chemistry, Lancaster University, Bailrigg, Lancaster LA1 4YB, United Kingdom
| | - Jonathan Austin
- National Nuclear Laboratory, Chadwick House, Birchwood Park, Warrington WA3 6AE, United Kingdom
| | - Nikolas Kaltsoyannis
- Department of Chemistry, University College London, 20 Gordon Street, London WC1H 0AJ, United Kingdom
- School of Chemistry, The University of Manchester, Manchester M13 9PL, United Kingdom
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11
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Ou X, Zhuang Z, Li J, Huang F, Lin Z. Mechanism of adsorption affinity and capacity of Mg(OH)2 to uranyl revealed by molecular dynamics simulation. RSC Adv 2016. [DOI: 10.1039/c6ra00384b] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The redistribution of surface OH groups results in a negative charge site which facilitates the uranyl adsorption.
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Affiliation(s)
- Xinwen Ou
- Key Laboratory of Design and Assembly of Functional Nanostructures
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- China
| | - Zanyong Zhuang
- Key Laboratory of Design and Assembly of Functional Nanostructures
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- China
| | - Jingyuan Li
- CAS Key Laboratory for Biomedical Effects of Nanomaterials and Nanosafety
- Institute of High Energy Physics
- Chinese Academy of Sciences
- Beijing 100049
- China
| | - Feng Huang
- State Key Laboratory of Optoelectronic Materials and Technologies
- School of Physics and Engineering
- Sun Yat-Sen University
- Guangzhou 510275
- China
| | - Zhang Lin
- Key Laboratory of Design and Assembly of Functional Nanostructures
- Fujian Institute of Research on the Structure of Matter
- Chinese Academy of Sciences
- Fuzhou
- China
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12
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Geckeis H, Lützenkirchen J, Polly R, Rabung T, Schmidt M. Mineral–Water Interface Reactions of Actinides. Chem Rev 2013; 113:1016-62. [DOI: 10.1021/cr300370h] [Citation(s) in RCA: 223] [Impact Index Per Article: 20.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Horst Geckeis
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal
(INE), Karlsruhe, P.O.Box 3640, D-76021 Karlsruhe, Germany
| | - Johannes Lützenkirchen
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal
(INE), Karlsruhe, P.O.Box 3640, D-76021 Karlsruhe, Germany
| | - Robert Polly
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal
(INE), Karlsruhe, P.O.Box 3640, D-76021 Karlsruhe, Germany
| | - Thomas Rabung
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal
(INE), Karlsruhe, P.O.Box 3640, D-76021 Karlsruhe, Germany
| | - Moritz Schmidt
- Karlsruhe Institute of Technology (KIT), Institute for Nuclear Waste Disposal
(INE), Karlsruhe, P.O.Box 3640, D-76021 Karlsruhe, Germany
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13
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Sebbari K, Roques J, Domain C, Simoni E. Uranyl ion interaction at the water/NiO(100) interface: A predictive investigation by first-principles molecular dynamic simulations. J Chem Phys 2012; 137:164701. [DOI: 10.1063/1.4759506] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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14
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Lectez S, Roques J, Salanne M, Simoni E. Car-Parrinello molecular dynamics study of the uranyl behaviour at the gibbsite/water interface. J Chem Phys 2012; 137:154705. [DOI: 10.1063/1.4758935] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Affiliation(s)
- Sébastien Lectez
- Institut de Physique Nucléaire d'Orsay, Université Paris-Sud, CNRS UMR 8608, 15 rue Georges Clémenceau, Bâtiment 100, 91406 ORSAY Cedex, France
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15
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Kremleva A, Martorell B, Krüger S, Rösch N. Uranyl adsorption on solvated edge surfaces of pyrophyllite: a DFT model study. Phys Chem Chem Phys 2012; 14:5815-23. [DOI: 10.1039/c2cp23886a] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Alena Kremleva
- Department Chemie & Catalysis Research Center, Technische Universität München, 85747 Garching, Germany
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16
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Pan QJ, Odoh SO, Asaduzzaman AM, Schreckenbach G. Adsorption of Uranyl Species onto the Rutile (110) Surface: A Periodic DFT Study. Chemistry 2011; 18:1458-66. [DOI: 10.1002/chem.201101320] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2011] [Indexed: 11/12/2022]
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Abstract
The U-O(yl) triple bonds in the UO(2)(2+) aquo ion are known to be weakened by replacing the first shell water with organic or inorganic ligands. Weakening of the U-O(yl) bond may enhance the reactivity of "yl" oxygens and uranyl(VI) cation-cation interactions. Density functional theory calculations as well as previously published vibrational spectroscopic data have been used to study the origin of the U-O(yl) bond weakening in uranyl(VI) coordination complexes. Natural population analyses (NPA) revealed that the electron localization on the O(yl) 2p orbital is a direct measure of the U-O(yl) bond weakening, indicating that the bond weakening is correlated to the weakening of the U-O(yl) covalent bond and not that of the ionic bond. The Mulliken analysis gives poor results for uranium to ligand electron partitioning and is thus unreliable. Further analyses of molecular orbitals near the highest occupied molecular orbital (HOMO) show that both the σ and π donating abilities of the ligands may account for the U-O(yl) bond weakening. The mechanism of the bond weakening varies with coordinating ligand so that each case needs to be examined independently.
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Affiliation(s)
- Satoru Tsushima
- Institut für Radiochemie, Helmholtz Zentrum Dresden-Rossendorf (HZDR), Bautzner Landstrasse 400, 01328, Dresden, Germany.
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18
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Abstract
Abstract
We overview quantum mechanical simulations that model the adsorption of actinide ions at solvated mineral surfaces. Pertinent examples illustrate the status of this emerging field of computational chemistry. In particular, we describe our own studies on uranyl adsorption on kaolinite. Already the few available results, from applications of density functional methods to cluster models or periodic slab models, show that such calculations are a useful complement to experimental investigations. Detailed information at the atomic level from accurate electronic structure calculations on well defined model systems helps to refine current interpretations of the chemical nature of uranyl adsorption species and to discover new features of these interface systems. Results from quantum mechanical simulations also provide a valuable reference for future experimental investigations.
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Vyalikh A, Zesewitz K, Scheler U. Hydrogen bonds and local symmetry in the crystal structure of gibbsite. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2010; 48:877-881. [PMID: 20845364 DOI: 10.1002/mrc.2682] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
First-principles quantum mechanical calculations of NMR chemical shifts and quadrupolar parameters have been carried out to assign the (27)Al MAS NMR resonances in gibbsite. The (27)Al NMR spectrum shows two signals for octahedral aluminum revealing two aluminum sites coordinated by six hydroxyl groups each, although the crystallographic positions of the two Al sites show little difference. The presence of two distinguished (27)Al NMR resonances characterized by rather similar chemical shifts but quadrupolar coupling constants differing by roughly a factor of two is explained by different character of the hydrogen bonds, in which the hydroxyls forming the corresponding octahedron around each aluminum site, are involved. The Al-I site characterized by a C(Q) = 4.6 MHz is surrounded by OH-groups participating in four intralayer and two interlayer hydrogen bonds, while the Al-II site with the smaller quadrupolar constant (2.2 MHz) is coordinated by hydroxides, of which two point toward the intralayer cavities and four OH-bonds are aligned toward the interlayer gallery. In high-resolution solid-state (1)H CRAMPS (combination of rotation and multiple-pulse spectroscopy) four signals with an intensity ratio of 1:2:2:1 are resolved which allow to distinguish six nonequivalent hydrogen sites reported in the gibbsite crystal structure and to ascribe them to two types of structural OH groups associated with intralayer and interlayer hydrogen bonds. This study can be applied to characterize the gibbsite-like layer-intergallery interactions associated with hydrogen bonding in the more complex systems, such as synthetic aluminum layered double hydroxides.
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Affiliation(s)
- Anastasia Vyalikh
- Leibniz Institute of Polymer Research Dresden, Hohe Str. 6, D-01069 Dresden, Germany
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20
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Roques J, Veilly E, Simoni E. Periodic density functional theory investigation of the uranyl ion sorption on three mineral surfaces: a comparative study. Int J Mol Sci 2009; 10:2633-2661. [PMID: 19582222 PMCID: PMC2705509 DOI: 10.3390/ijms10062633] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2009] [Revised: 05/25/2009] [Accepted: 06/01/2009] [Indexed: 11/16/2022] Open
Abstract
Canister integrity and radionuclides retention is of prime importance for assessing the long term safety of nuclear waste stored in engineered geologic depositories. A comparative investigation of the interaction of uranyl ion with three different mineral surfaces has thus been undertaken in order to point out the influence of surface composition on the adsorption mechanism(s). Periodic DFT calculations using plane waves basis sets with the GGA formalism were performed on the TiO(2)(110), Al(OH)(3)(001) and Ni(111) surfaces. This study has clearly shown that three parameters play an important role in the uranyl adsorption mechanism: the solvent (H(2)O) distribution at the interface, the nature of the adsorption site and finally, the surface atoms' protonation state.
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Affiliation(s)
- Jérôme Roques
- Author to whom correspondence should be addressed; E-Mail:
; Tel. +33-169156869; Fax: +33-169157150
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