Article contents
Bacterial production of vanadium ferrite spinel (Fe,V)3O4 nanoparticles
Published online by Cambridge University Press: 01 July 2020
Abstract
Biogenic nanoscale vanadium magnetite is produced by converting V(V)-bearing ferrihydrites through reductive transformation using the metal-reducing bacterium Geobacter sulfurreducens. With increasing vanadium in the ferrihydrite, the amount of V-doped magnetite produced decreased due to V-toxicity which interrupted the reduction pathway ferrihydrite–magnetite, resulting in siderite or goethite formation. Fe L2,3 and V L2,3 X-ray absorption spectra and data from X-ray magnetic circular dichroism analysis revealed the magnetite to contain the V in the Fe(III) Oh site, predominately as V(III) but always with a component of V(VI), present a consistent V(IV)/V(III) ratio in the range 0.28 to 0.33. The bacteriogenic production of V-doped magnetite nanoparticles from V-doped ferrihydrite is confirmed and the work reveals that microbial reduction of contaminant V(V) to V(III)/V(IV) in the environment will occur below the Fe-redox boundary where it will be immobilised in biomagnetite nanoparticles.
- Type
- Article
- Information
- Copyright
- Copyright © The Mineralogical Society of Great Britain and Ireland, 2020
Footnotes
Current address: CHESS/Wilson Lab, 161 Synchrotron Drive, Ithica, NY 14853, 607-255-7163, USA.
Associate Editor: Janice Kenney
References
- 6
- Cited by