XAFS investigation of the interactions of uranium (VI) with secondary mineralization products from the bioreduction of iron (III) oxides.
Journal Article
·
· Environmental Science and Technology
- Biosciences Division
Biogenic Fe{sup II} phases (magnetite, green rust, siderite, vivianite, etc.) provide a reservoir of reducing capacity in many subsurface environments that may contribute to the reduction of contaminants such as U{sup VI}. We have examined the uptake and reduction of U{sup VI} in the presence of biogenic green rust (BioGR), magnetite (BioMAG), and siderite (BioSID) formed during the reduction of Fe{sup III} oxides by Shewanella putrefaciens CN32. Within 48 h, total solution-phase U{sup VI} concentrations decreased from 500{mu}M to 1.5{mu}M, 392{mu}M, and 472{mu}M in the U-BioGR, U-BioMAG, and U-BioSID systems, respectively. Analysis of the samples by U L{sub III} extended X-ray absorption fine structure spectroscopy (EXAFS) indicated that despite a stoichiometric excess of Fe{sup II}, no more than 6% of U{sup VI} was reduced to U{sup IV} in the U-BioSID system, and no more than 22% of U{sup VI} was reduced in the U-BioMAG system. For comparison, in the U-BioGR system, >99% of U{sup VI} was reduced to U{sup IV}. Uptake of U{sup VI} by BioGR and BioMAG was accompanied by formation of nanoparticulate uraninite. The U EXAFS data for the U-BioSID system were consistent with partial U{sup VI}/U{sup IV} substitution for Fe{sup II} in the surface layer of siderite particles and adsorption of U{sup IV}.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1026628
- Report Number(s):
- ANL/BIO/JA-65197
- Journal Information:
- Environmental Science and Technology, Journal Name: Environmental Science and Technology Journal Issue: 5 Vol. 44; ISSN ESTHAG; ISSN 0013-936X
- Country of Publication:
- United States
- Language:
- ENGLISH
Similar Records
Reduction of Vanadium(V) by Iron(II)-Bearing Minerals
Electron Donor Utilization and Secondary Mineral Formation during the Bioreduction of Lepidocrocite by Shewanella putrefaciens CN32
Effects of oxyanions, natural organic matter, and bacterial cell numbers on the bioreduction of lepidocrocite ({gamma}-FeOOH) and the formation of secondary mineralization products.
Journal Article
·
Wed Mar 17 20:00:00 EDT 2021
· Minerals
·
OSTI ID:1798316
Electron Donor Utilization and Secondary Mineral Formation during the Bioreduction of Lepidocrocite by Shewanella putrefaciens CN32
Journal Article
·
Sat Jul 13 20:00:00 EDT 2019
· Minerals
·
OSTI ID:1560537
Effects of oxyanions, natural organic matter, and bacterial cell numbers on the bioreduction of lepidocrocite ({gamma}-FeOOH) and the formation of secondary mineralization products.
Journal Article
·
Tue Jun 15 00:00:00 EDT 2010
· Environ. Sci. Technol.
·
OSTI ID:982673