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Microbial oxidation of Fe21 and pyrite exposed to flux of micromolar H2O2 in acidic media

Ma, Y and Lin, C 2013, 'Microbial oxidation of Fe21 and pyrite exposed to flux of micromolar H2O2 in acidic media' , Scientific Reports, 3 (1979) , pp. 1-10.

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At an initial pH of 2, while abiotic oxidation of aqueous Fe21 was enhanced by a flux of H2O2 at micromolar concentrations, bio-oxidation of aqueous Fe21 could be impeded due to oxidative stress/damage in Acidithiobacillus ferrooxidans caused by Fenton reaction-derived hydroxyl radical, particularly when the molar ratio of Fe21 toH2O2 was low. When pyrite cubes were intermittently exposed to fluxes of micromolar H2O2, the reduced Fe21-Fe31 conversion rate in the solution (due to reduced microbial activity) weakened the Fe31-catalyzed oxidation of cubic pyrite and added to relative importance of H2O2-driven oxidation in the corrosion of mineral surfaces for the treatments with high H2O2 doses. This had effects on reducing the build-up of a passivating coating layer on the mineral surfaces. Cell attachment to the mineral surfaces was only observed at the later stage of the experiment after the solutions became less favorable for the growth of planktonic bacteria.

Item Type: Article
Schools: Schools > School of Environment and Life Sciences > Ecosystems and Environment Research Centre
Journal or Publication Title: Scientific Reports
Publisher: Nature Publishing Group
ISSN: 2045-2322
Related URLs:
Funders: Non funded research
Depositing User: C Lin
Date Deposited: 22 Mar 2016 14:22
Last Modified: 22 Mar 2016 14:22

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