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Bacterial production of vanadium ferrite spinel (Fe,V)3O4 nanoparticles

DOI: 10.1180/mgm.2020.55 DOI Help

Authors: V. S. Coker (University of Manchester) , G. Van Der Laan (Diamond Light Source) , N. D. Telling (Keele University) , J. R. Lloyd (University of Manchester) , J. M. Byrne (University of Tuebingen) , E. Arenholz (Advanced Light Source) , R. A. D. Pattrick (University of Manchester)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Mineralogical Magazine

State: Published (Approved)
Published: July 2020
Diamond Proposal Number(s): 838

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.

Journal Keywords: vanadium; biomagnetite; Geobacter sulfurreducens; L2,3-edge XAS; XMCD

Subject Areas: Earth Science

Instruments: I06-Nanoscience

Other Facilities: Advanced Light Source