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Unraveling pH-Dependent Changes in Adsorption Structure of Uranyl on Alumina (012)

Journal Article · · Journal of Physical Chemistry Letters
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 angstrom 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. Finally, 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.
Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
German Federal Ministry for the Environment, Nature Conservation, Nuclear Safety, and Consumer Protection; USDOE Office of Energy Efficiency and Renewable Energy (EERE), Energy Efficiency Office. Advanced Materials & Manufacturing Technologies Office (AMMTO); USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB)
Grant/Contract Number:
AC02-06CH11357; SC0022213
OSTI ID:
2497710
Journal Information:
Journal of Physical Chemistry Letters, Journal Name: Journal of Physical Chemistry Letters Journal Issue: 13 Vol. 15; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (45)

Determination of actinide speciation in solution using high-energy X-ray scattering journal July 2005
The structure of uranium (VI) sorption complexes on silica, alumina, and montmorillonite journal July 2000
Point of zero charge of a corundum-water interface probed with optical second harmonic generation (SHG) and atomic force microscopy (AFM): New approaches to oxide surface charge journal September 2001
Uranium speciation in waters of different uranium mining areas journal June 1998
The isoelectric points of sapphire crystals and alpha-alumina powder journal March 2003
Adsorption of uranyl tricarbonate and calcium uranyl carbonate onto γ-alumina journal July 2018
Uranium in natural waters and the environment: Distribution, speciation and impact journal January 2023
Effect of silicate on U(VI) sorption to γ-Al2O3: Batch and EXAFS studies journal June 2015
The surface reactions of U(VI) on γ-Al2O3 — In situ spectroscopic evaluation of the transition from sorption complexation to surface precipitation journal October 2013
Sorption of uranyl ions on gibbsite: effects of contact time, pH, ionic strength, concentration and anion of electrolyte journal January 2005
Sorption of U(VI) and phosphate on γ-alumina: Binary and ternary sorption systems journal March 2009
Bond-valence methods for pKa prediction: critical reanalysis and a new approach journal May 2004
CTR diffraction and grazing-incidence EXAFS study of U(VI) adsorption onto α-Al2O3 and α-Fe2O3 (11̄02) surfaces journal July 2005
Uranyl and arsenate cosorption on aluminum oxide surface journal May 2009
The structure of monomeric and dimeric uranyl adsorption complexes on gibbsite: A combined DFT and EXAFS study journal October 2009
Comparative response of interfacial water structure to pH variations and arsenate adsorption on corundum (0 1 2) and (0 0 1) surfaces journal February 2019
Uranyl sorption onto gibbsite studied by time-resolved laser-induced fluorescence spectroscopy (TRLFS) journal October 2005
On the relationship between charge distribution, surface hydration, and the structure of the interface of metal hydroxides journal September 2006
Surface water H-bonding network is key controller of selenate adsorption on [0 1 2] α-alumina: An Ab-initio study journal July 2022
A multi-scalar study of the long-term reactivity of uranium mill tailings from Bellezane site (France) journal July 2020
Uranium re-adsorption on uranium mill tailings and environmental implications journal August 2021
An overview and recent progress in the heterogeneous photocatalytic reduction of U(VI) journal December 2019
Adsorption of uranium from groundwater using heated aluminum oxide particles journal April 2021
Emerging natural and tailored materials for uranium-contaminated water treatment and environmental remediation journal June 2019
Occurrence, behavior and distribution of high levels of uranium in shallow groundwater at Datong basin, northern China journal February 2014
Y(III) Sorption at the Orthoclase (001) Surface Measured by X-ray Reflectivity journal December 2022
Effect of Background Electrolyte Composition on the Interfacial Formation of Th(IV) Nanoparticles on the Muscovite (001) Basal Plane journal July 2021
Chemistry of Actinide Centers in Heterogeneous Catalytic Transformations of Small Molecules journal April 2019
Adsorption of Uranyl on Gibbsite:  A Time-Resolved Laser-Induced Fluorescence Spectroscopy Study journal February 2006
Cluster-Models for Uranyl(VI) Adsorption on α-Alumina journal January 2011
Effect of pH on the Water/α-Al 2 O 3 (11̅02) Interface Structure Studied by Sum-Frequency Vibrational Spectroscopy journal June 2011
Structure of Uranium(VI) in Strong Alkaline Solutions. A Combined Theoretical and Experimental Investigation journal October 1999
Termination and Water Adsorption at the α-Al 2 O 3 (012)−Aqueous Solution Interface journal May 2006
Hydrated Cation Speciation at the Muscovite (001)−Water Interface journal November 2010
Interfacial Charging Phenomena of Aluminum (Hydr)oxides journal August 1999
Structure of clean and hydrated α-Al2O3 (11̄02) surfaces: implication on surface charge journal January 2011
Uranyl interaction with the hydrated (001) basal face of gibbsite: A combined theoretical and spectroscopic study journal December 2008
A new x-ray interface and surface scattering environmental cell design for in situ studies of radioactive and atmosphere-sensitive samples journal July 2011
Depleted and Natural Uranium: Chemistry and Toxicological Effects journal July 2004
Crystal truncation rods and surface roughness journal March 1986
Ab initio morphology and surface thermodynamics of α − Al 2 O 3 journal March 2004
Phasing of resonant anomalous X-ray reflectivity spectra and direct Fourier synthesis of element-specific partial structures at buried interfaces journal March 2007
Uranium Sorption on α-Alumina: Effects of pH and Surface-Area/Solution-Volume Ratio journal December 1994
X-ray Reflectivity as a Probe of Mineral-Fluid Interfaces: A User Guide journal January 2002
Process water treatment at the Ranger uranium mine, Northern Australia journal May 2003

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