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Uranium surface processes with sandstone and volcanic rocks in acidic and alkaline solutions

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dc.contributor.authorKenney, Janice
dc.contributor.authorLezama-Pacheco, Juan
dc.contributor.authorFendorf, Scott
dc.contributor.authorAlessi, Daniel S.
dc.contributor.authorWeiss, Dominik J.
dc.date.accessioned2023-12-18T17:27:54Z
dc.date.available2023-12-18T17:27:54Z
dc.date.issued2023
dc.description.abstractUnderstanding the behaviour of uranium waste, for disposal purposes, is crucial due to the correlation between pH values and the disposal of distinct types of waste, with low level waste typically associated with acidic pH values, and higher and intermediate level waste commonly related to alkaline pH values. We studied the adsorption of U(VI) on sandstone and volcanic rock surfaces at pH 5.5 and 11.5 in aqueous solutions with and without bicarbonate (2 mM HCO3–) using XAS and FTIR. In the sandstone system, U(VI) adsorbs as a bidentate complex to Si at pH 5.5 without bicarbonate and as uranyl carbonate species with bicarbonate. At pH 11.5 without bicarbonate, U(VI) adsorbs as monodentate complexes to Si and precipitates as uranophane. With bicarbonate at pH 11.5, U(VI) precipitated as a Na-clarkeite mineral or remained as a uranyl carbonate surface species. In the volcanic rock system, U(VI) adsorbed to Si as an outer sphere complex at pH 5.5, regardless of the presence of bicarbonate. At pH 11.5 without bicarbonate, U(VI) adsorbed as a monodentate complex to one Si atom and precipitated as a Na-clarkeite mineral. With bicarbonate at pH 11.5, U(VI) sorbed as a bidentate carbonate complex to one Si atom. These results provide insight into the behaviour of U(VI) in heterogeneous, real-world systems related to the disposal of radioactive waste.
dc.identifier.citationKenney, J. P. L., Lezama-Pacheco, J., Fendorf, S., Alessi, D. S., & Weiss, D. J. (2023). Uranium surface processes with sandstone and volcanic rocks in acidic and alkaline solutions. Journal of Colloid and Interface Science, 645, 715–723. https://doi.org/10.1016/j.jcis.2023.04.174
dc.identifier.doihttps://doi.org/10.1016/j.jcis.2023.04.174
dc.identifier.urihttps://hdl.handle.net/20.500.14078/3291
dc.language.isoen
dc.rightsAttribution (CC BY)
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.subjectadsorption
dc.subjectprecipitation
dc.subjecturanium
dc.subjectEXAFS
dc.subjectFTIR
dc.subjectsurface complexation modelling
dc.subjectradioactive waste disposal
dc.titleUranium surface processes with sandstone and volcanic rocks in acidic and alkaline solutionsen
dc.typeArticle

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