Publikationsrepositorium - Helmholtz-Zentrum Dresden-Rossendorf
1 PublikationAbiotic U(VI) Reduction by Biogenic Mackinawite
Veeramani, H.; Qafoku, N.; Pruden, A.; Monsegue, N.; Kukkadapu, R.; Murayama, M.; Newville, M.; Lanzirotti, A.; Scheinost, A. C.; Hochella, M. F.
Abstract
Biogenic mackinawite (FeS) produced by Shewanella putrefaciens CN32 is submicron in size but nanosized in one dimension (film-like morphology)
Biogenic FeS is very reactive evident by its propensity to reduced U(VI) and rapid oxidation to form lepidocrocite upon exposure to air.
U(VI) reduction is observed in the pasteurized control indicative of a non-enzymatic redox process.
XAS and nanodiffraction techniques (bulk and nanoscale analyses) confirm the formation of UO2.
UO2 particles are nanoparticulate measuring c.a. 2.5 nm in size.
The present work suggests that a remediation strategy could potentially incorporate subsurface abiotic redox interactions between biogenic Fe(II)-bearing minerals such as mackinawite & contaminant U(VI) to immobilize U as UO2 – an in-situ waste form.
Keywords: Mackinawite; uranyl; reduction; XAFS
Beteiligte Forschungsanlagen
- Rossendorf Beamline an der ESRF DOI: 10.1107/S1600577520014265
Verknüpfte Publikationen
- DOI: 10.1107/S1600577520014265 is cited by this (Id 17424) publication
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Poster
The 22nd V.M. Goldschmidt Conference 2012, 24.-29.06.2012, Montreal, Canada
Permalink: https://www.hzdr.de/publications/Publ-17424