Pyrite oxidation under initially neutral pH conditions and in the presence of Acidithiobacillus ferrooxidans and micromolar hydrogen peroxide

Article

Ma, Y. and Lin, C.. 2012. "Pyrite oxidation under initially neutral pH conditions and in the presence of Acidithiobacillus ferrooxidans and micromolar hydrogen peroxide." Biogeosciences Discussions. 9, pp. 557-579. https://doi.org/10.5194/bgd-9-557-2012
Article Title

Pyrite oxidation under initially neutral pH conditions and in the presence of Acidithiobacillus ferrooxidans and
micromolar hydrogen peroxide

ERA Journal ID200213
Article CategoryArticle
AuthorsMa, Y. (Author) and Lin, C. (Author)
Journal TitleBiogeosciences Discussions
Journal Citation9, pp. 557-579
Number of Pages27
Year2012
Place of PublicationGermany
ISSN1810-6277
1810-6285
Digital Object Identifier (DOI)https://doi.org/10.5194/bgd-9-557-2012
Web Address (URL)http://www.biogeosciences-discuss.net/9/557/2012/
Abstract

Hydrogen peroxide (H2O2) at a micromolar level played a role in the microbial surface oxidation of pyrite crystals under initially neutral pH. When the mineral-bacteria system
was cyclically exposed to 50 μM H2O2, the colonization of Acidithiobacillus ferrooxidans onto the mineral surface was markedly enhanced, as compared to the control(no added H2O2). This can be attributed to the effects of H2O2 on increasing the roughness of the mineral surfaces, as well as the acidity and Fe2+ concentration at the mineral-solution interfaces. All of these effects tended to create more favourable nanoto micro-scale environments in the mineral surfaces for the cell adsorption. However, higher H2O2 levels inhibited the attachment of cells onto the mineral surfaces, possibly due to the oxidative stress in the bacteria when they approached the mineral surfaces
where high levels of free radicals are present as a result of Fenton-like reactions. The more aggressive nature of H2O2 as an oxidant caused marked surface flaking of the
mineral surface. The XPS results suggest that H2O2 accelerated the oxidation of pyrite-S and consequently facilitated the overall corrosion cycle of pyrite surfaces. This was accompanied by pH drop in the solution in contact with the pyrite cubes.

KeywordsAcidithiobacillus ferrooxidans; pyrite oxidation; hydrogen peroxide
ANZSRC Field of Research 2020370399. Geochemistry not elsewhere classified
Byline AffiliationsSouth China Agricultural University, China
Australian Centre for Sustainable Catchments
Institution of OriginUniversity of Southern Queensland
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