Effect of amorphous Fe(III) oxide transformation on the Fe(II)-mediated reduction of U(VI).

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dc.contributor.authorBoland, DDen_AU
dc.contributor.authorCollins, RNen_AU
dc.contributor.authorPayne, TEen_AU
dc.contributor.authorWaite, TDen_AU
dc.date.accessioned2011-03-30T04:56:43Zen_AU
dc.date.available2011-03-30T04:56:43Zen_AU
dc.date.issued2011-02-15en_AU
dc.date.statistics2011-02-15en_AU
dc.description.abstractIt has recently been reported that the Fe(II)-catalyzed crystallization of 2-line ferrihydrite to goethite and magnetite can result in the immobilization of uranium. Although it might be expected that interference of the crystallization process (for example, by the presence of silicate) would prevent uranium immobilization, this has not yet been demonstrated. Here we present results of an X-ray absorption spectroscopy study on the fate of hexavalent uranium (U(VI)) during the Fe(II)-catalyzed transformations of 2-line ferrihydrite and ferrihydrite coprecipitated with silicate (silicate−ferrihydrite). Two-line ferrihydrite transformed monotonically to goethite, whereas silicate−ferrihydrite transformed into a form similar to ferrihydrite synthesized in the absence of silicate. Modeling of U L(III)-edge EXAFS data indicated that both coprecipitated and adsorbed U(VI) were initially associated with ferrihydrite and silicate−ferrihydrite as a mononuclear bidentate surface complex. During the Fe(II)-catalyzed transformation process, U(VI) associated with 2-line ferrihydrite was reduced and partially incorporated into the newly formed goethite mineral structure, most likely as U(V), whereas U(VI) associated with silicate−ferrihydrite was not reduced and remained in a form similar to its initially adsorbed state. Uranium(VI) that was initially adsorbed to silicate−ferrihydrite did, however, become more resistant to reductive dissolution indicating at least a partial reduction in mobility. These results suggest that when the Fe(II)-catalyzed transformation of ferrihydrite-like iron oxyhydroxides is inhibited, at least under conditions similar to those used in these experiments, uranium reduction will not occur. © 2011, American Chemical Societyen_AU
dc.identifier.citationBoland, D. D., Collins, R. N., Payne, T. E., & Waite, T. D. (2011). Effect of amorphous Fe(III) oxide transformation on the Fe(II)-mediated reduction of U(VI). Environmental Science & Technology, 45(4), 1327-1333. doi:10.1021/es101848aen_AU
dc.identifier.govdoc3329en_AU
dc.identifier.issn0013-936Xen_AU
dc.identifier.issue4en_AU
dc.identifier.journaltitleEnvironmental Science & Technologyen_AU
dc.identifier.pagination1327-1333en_AU
dc.identifier.urihttp://dx.doi.org/10.1021/es101848aen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/3162en_AU
dc.identifier.volume45en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectCrystallizationen_AU
dc.subjectGoethiteen_AU
dc.subjectMagnetiteen_AU
dc.subjectUraniumen_AU
dc.subjectAbsorption spectroscopyen_AU
dc.subjectSilicatesen_AU
dc.titleEffect of amorphous Fe(III) oxide transformation on the Fe(II)-mediated reduction of U(VI).en_AU
dc.typeJournal Articleen_AU
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