Inhibition of uranium (VI) sorption on titanium dioxide by surface iron (III) species in ferric oxide/titanium dioxide systems

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dc.contributor.authorComarmond, MJen_AU
dc.contributor.authorPayne, TEen_AU
dc.contributor.authorCollins, RNen_AU
dc.contributor.authorPalmer, Gen_AU
dc.contributor.authorLumpkin, GRen_AU
dc.contributor.authorAngove, MJen_AU
dc.date.accessioned2014-10-16T05:41:02Zen_AU
dc.date.available2014-10-16T05:41:02Zen_AU
dc.date.issued2012-10-16en_AU
dc.date.statistics2014-10-16en_AU
dc.description.abstractUranium (U(VI)) sorption in systems containing titanium dioxide (TiO2) and various Fe(M)-oxide phases was investigated in the acidic pH range (pH 2.5-6). Studies were conducted with physical mixtures of TiO2 and ferrihydrite, TiO2 with coprecipitated ferrihydrite, and with systems where Fe(III) was mostly present as crystalline Fe(III) oxides. The presence of ferrihydrite resulted in decreased U(VI) sorption relative to the pure TiO2 systems, particularly below pH 4, an unexpected result given that the presence of another sorbent would be expected to increase U(VI) uptake. In mixtures of TiO2 and crystalline Fe(III) oxide phases, U(VI) sorption was higher than for the analogous mixtures of TiO2 with ferrihydrite, and was similar to U(VI) sorption on TiO2 alone. X-ray absorption spectroscopy of the TiO2 system with freshly precipitated Fe(III) oxides indicated the presence Fe(III) surface phase that inhibits U(VI) sorption-a reaction whereby Fe(III) precipitates as lepidocrocite and/or ferrihydrite effectively blocking surface sorption sites on the underlying TiO2. Competition between dissolved Fe(III) and U(VI) for sorption sites may also contribute to the observed decrease in U(VI) sorption. The present study demonstrates the complexity of sorption in mixed systems, where the oxide phases do not necessarily behave in an additive manner, and has implications for U(VI) mobility in natural and impacted environments where Fe(III) (oxyhydr)oxides are usually assumed to increase the retention of U(VI). © 2012, American Chemical Society.en_AU
dc.identifier.citationComarmond, M. J., Payne, T. E., Collins, R. N., Palmer, G., Lumpkin, G. R., & Angove, M. J. (2012). Inhibition of uranium (VI) sorption on titanium dioxide by surface iron (III) species in ferric oxide/titanium dioxide systems. Environmental Science & Technology, 46(20), 11128-11134. doi:10.1021/es302574jen_AU
dc.identifier.govdoc4747en_AU
dc.identifier.issn0013-936Xen_AU
dc.identifier.issue20en_AU
dc.identifier.journaltitleEnvironmental Science & Technologyen_AU
dc.identifier.pagination11128-11134en_AU
dc.identifier.urihttp://dx.doi.org/10.1021/es302574jen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/5920en_AU
dc.identifier.volume46en_AU
dc.language.isoenen_AU
dc.publisherAmerican Chemical Societyen_AU
dc.subjectAdsorptionen_AU
dc.subjectUraniumen_AU
dc.subjectSorptionen_AU
dc.subjectTitaniumen_AU
dc.subjectIronen_AU
dc.subjectOxidesen_AU
dc.titleInhibition of uranium (VI) sorption on titanium dioxide by surface iron (III) species in ferric oxide/titanium dioxide systemsen_AU
dc.typeJournal Articleen_AU
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