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Extracellular bacterial production of doped magnetite nanoparticles

Pattrick, Richard A D; Coker, Victoria S; Pearce, Carolyn I; Telling, Neil D; van der Laan, Gerrit; Lloyd, Jonathan R


Richard A D Pattrick

Victoria S Coker

Carolyn I Pearce

Gerrit van der Laan

Jonathan R Lloyd


Microorganisms have been producing nanoparticles for billions of years and by controlling and tuning this productivity they have the potential to provide novel materials using environmentally friendly manufacturing pathways. Metal-reducing bacteria are a particularly fertile source of nanoparticles and their reduction of Fe (III) oxides leads to the formation of ferrite spinel nanoparticles, especially magnetite, Fe3O4. The high yields produced by extracellular biomineralising processes make them commercially attractive, and the production of these bionano ferrite spinels can be tuned by doping the precursor Fe(III) phase with Co, Ni, Zn, Mn and V. The oxidation state of the cations and the sites of substitution are determined by X-ray absorption spectroscopy (XAS), especially by examination of metal L-edge spectra and X-ray magnetic circular dichroism (XMCD). Vanadium substitution in bionano ferrite spinels is revealed for the first time, and substitution in the octahedral site as V(III) confirmed. Bionanomagnetite is shown to be effective in the remediation of azo dyes with the complete breakdown of Remazol Black B to colourless amines and acids. XMCD shows this to involve oxidation of the surface Fe(III) and the potential for regeneration of the nanoparticles.


Pattrick, R. A. D., Coker, V. S., Pearce, C. I., Telling, N. D., van der Laan, G., & Lloyd, J. R. (2012). Extracellular bacterial production of doped magnetite nanoparticles. In Nanoscience: Volume 1: Nanostructures through Chemistry (102-115). Royal Society of Chemistry.

Online Publication Date Dec 31, 2012
Publication Date 2012
Deposit Date May 22, 2024
Publisher Royal Society of Chemistry
Pages 102-115
Book Title Nanoscience: Volume 1: Nanostructures through Chemistry
ISBN 978-1-84973-435-6
Public URL
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