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dc.contributor.authorAlexandratos, Vasso G.
dc.contributor.authorBehrends, Thilo
dc.contributor.authorVan Cappellen, Philippe
dc.date.accessioned2017-05-25 15:09:38 (GMT)
dc.date.available2017-05-25 15:09:38 (GMT)
dc.date.issued2017-02-21
dc.identifier.urihttp://dx.doi.org/10.1021/acs.est.6b05453
dc.identifier.urihttp://hdl.handle.net/10012/11950
dc.description.abstractThe impact on U(VI) adsorbed to lepidocrocite (gamma-FeOOH) and hematite (alpha-Fe2O3) was assessed when exposed to aqueous sulfide (S(II)(aq)) at pH 8.0. With both minerals, competition between S(-II) and U(VI) for surface sites caused instantaneous release of adsorbed U(VI). Compared to lepidocrocite, consumption of S(-II)(aq) proceeded slower with hematite, but yielded maximum dissolved U concentrations that were more than 10 times higher, representing about one-third of the initially adsorbed U. Prolonged presence of S(-II)(aq) in experiments with hematite in combination with a larger release of adsorbed U(VI), enhanced the reduction of U(VI): after 24 h of reaction about 60-70% of U was in the form of U(W), much higher than the 2S% detected in the lepidocrocite suspensions. X-ray absorption spectra indicated that U(IV) in both hematite and lepidocrocite suspensions was not in the form of uraninite (UO2). Upon exposure to oxygen only part of U(IV) reoxidized, suggesting that monomeric U(W) might have become incorporated newly formed iron precipitates. sulfidization of Fe oxides can have diverse consequences for U mobility: in short-term, desorption of U(VI) increases U mobility, while reduction to U(W) and its possible incorporation in Fe transformation products may lead to long-term U immobilization.en
dc.description.sponsorshipEuropean Union's European Atomic Energy Community's (Euratom) Seventh Framework Programme FP7 [212287]en
dc.language.isoenen
dc.publisherAmerican Chemical Societyen
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/legalcode*
dc.subjectRay-Absorption Spectroscopyen
dc.subjectGoethite Alpha-Feoohen
dc.subjectAcid-Sulfate Soilen
dc.subjectSurface Complexationen
dc.subjectDissolved Sulfideen
dc.subjectReductive Immobilizationen
dc.subjectUranium(Vi) Adsorptionen
dc.subjectContaminated Aquiferen
dc.subjectNoncrystalline U(Iv)en
dc.subjectHexavalent Uraniumen
dc.titleFate of Adsorbed U(VI) during Sulfidization of Lepidocrocite and Hematiteen
dc.typeArticleen
dcterms.bibliographicCitationAlexandratos, V. G., Behrends, T., & Van Cappellen, P. (2017). Fate of Adsorbed U(VI) during Sulfidization of Lepidocrocite and Hematite. Environmental Science & Technology, 51(4), 2140–2150. https://doi.org/10.1021/acs.est.6b05453en
uws.contributor.affiliation1Faculty of Scienceen
uws.contributor.affiliation2Earth and Environmental Sciencesen
uws.typeOfResourceTexten
uws.typeOfResourceTexten
uws.peerReviewStatusRevieweden
uws.scholarLevelFacultyen


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