Journal
GEOMICROBIOLOGY JOURNAL
Volume 36, Issue 2, Pages 169-178Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/01490451.2018.1526986
Keywords
Extracellular electron transfer; birnessite; electrochemically active microorganisms; red soil
Funding
- National Basic Research Program of China [2014CB846001]
- Natural Science of Foundation of China [41230103, 41522201, 41402032]
- NSFC Projects of International Cooperation and Exchanges [418001018]
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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 omega-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.
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