Unraveling pH-Dependent Changes in Adsorption Structure of Uranyl on Alumina (012)
Journal Article
·
· Journal of Physical Chemistry Letters
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Helmholtz-Zentrum Dresden-Rossendorf, (Germany). Institute of Resource Ecology
- Washington Univ., St. Louis, MO (United States)
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
Similar Records
Bridging arsenate surface complexes on the hematite (012) surface.
Speciation of uranyl sorbed at multiple binding sites on montmorillonite
Reduction of uranyl and uranyl-organic complexes mediated by magnetite and ilmenite: A combined electrochemical AFM and DFT study
Journal Article
·
Sun Apr 15 00:00:00 EDT 2007
· Geochim. Cosmochim. Acta
·
OSTI ID:914948
Speciation of uranyl sorbed at multiple binding sites on montmorillonite
Journal Article
·
Thu Sep 01 00:00:00 EDT 1994
· Geochimica et Cosmochimica Acta; (United States)
·
OSTI ID:6447483
Reduction of uranyl and uranyl-organic complexes mediated by magnetite and ilmenite: A combined electrochemical AFM and DFT study
Journal Article
·
Tue Oct 20 20:00:00 EDT 2020
· Geochimica et Cosmochimica Acta
·
OSTI ID:1849673