Extracellular Electron Transfer Between Birnessite and Electrochemically Active Bacteria Community from Red Soil in Hainan, China

The interplay between electrochemically active microorganisms (EAMs) and adjacent minerals universally occurs in natural environments, in which soil is an extremely typical and active one. We stimulated the extracellular electron transfer (EET) process between the bacterial community and birnessite...

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Bibliographic Details
Published in:Geomicrobiology journal 2019-02, Vol.36 (2), p.169-178
Main Authors: Sun, Manyi, Ren, Guiping, Li, Yan, Lu, Anhuai, Ding, Hongrui
Format: Article
Language:English
Subjects:
Bacteria
Biochemical fuel cells
Birnessite
Cathodes
Communities
electrochemically active microorganisms
Electron transfer
Electrons
Extracellular
Extracellular electron transfer
Fuel technology
Microorganisms
Minerals
Oxidoreductions
Oxygen
red soil
rRNA 16S
Soil
Soil bacteria
Soils
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Summary:The interplay between electrochemically active microorganisms (EAMs) and adjacent minerals universally occurs in natural environments, in which soil is an extremely typical and active one. We stimulated the extracellular electron transfer (EET) process between the bacterial community and birnessite in red soil (collected from Hainan, China) by constructing a microbial fuel cell equipped with synthetic birnessite cathode. Compared to graphite-cathode, the cell voltage of birnessite-cathode was increased by 22% when loading a 1000 Ω-resistance, indicating the EET between microbes and birnessite. Eleven genera of EAMs in red soil were confirmed through 16S rRNA analysis. Neither palpable novel mineral formation nor change of birnessite crystallinity was observed after reaction by Raman and SEM. As oxygen pumped into cathode chamber was the terminal electron acceptor, birnessite principally performed as an intermediate of holistic electron transfer process to favor the cathodic oxygen reduction.
ISSN:0149-0451
1521-0529
DOI:10.1080/01490451.2018.1526986