Microbial oxidation of Fe2+ and pyrite exposed to flux of micromolar H2O2 in acidic media

Article

Ma, Yingqun and Lin, Chuxia. 2013. "Microbial oxidation of Fe2+ and pyrite exposed to flux of micromolar H2O2 in acidic media." Scientific Reports. 3, pp. 1-10. https://doi.org/10.1038/srep01979
Article Title

Microbial oxidation of Fe2+ and pyrite exposed to flux of micromolar H2O2 in acidic media

ERA Journal ID201487
Article CategoryArticle
AuthorsMa, Yingqun (Author) and Lin, Chuxia (Author)
Journal TitleScientific Reports
Journal Citation3, pp. 1-10
Number of Pages10
Year2013
PublisherNature Publishing Group
Place of PublicationLondon, United Kingdom
ISSN2045-2322
Digital Object Identifier (DOI)https://doi.org/10.1038/srep01979
Web Address (URL)http://www.nature.com/srep/2013/130613/srep01979/full/srep01979.html
Abstract

At an initial pH of 2, while abiotic oxidation of aqueous Fe2+ was enhanced by a flux of H2O2 at micromolar concentrations, bio-oxidation of aqueous Fe2+ could be impeded due to oxidative stress/damage in Acidithiobacillus ferrooxidans caused by Fenton reaction-derived hydroxyl radical, particularly when the molar ratio of Fe 2+ to H2O2 was low. When pyrite cubes were intermittently exposed to fluxes of micromolar H2O2, the reduced Fe2+-Fe 3+ conversion rate in the solution (due to reduced microbial activity) weakened the Fe 3+-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 H 2O2 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.

Keywordsgeochemistry; pollution; remediation; soil microbiology; spectroscopy
ANZSRC Field of Research 2020370399. Geochemistry not elsewhere classified
340399. Macromolecular and materials chemistry not elsewhere classified
410603. Soil biology
Byline AffiliationsSouth China Agricultural University, China
Australian Centre for Sustainable Catchments
Institution of OriginUniversity of Southern Queensland
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