The Capacitor Effect of Redox Cycling of Fe(Ⅱ)and Fe(Ⅲ)in Magnetite on the Aceticlastic Methanogenesis of a Methanosarcina Enrichment
Microorganisms have evolved the ability to exchange electrons with extracellular minerals,especially the redox-active minerals containing iron and magnesium.Magnetite,a mixture of Fe(Ⅱ)and Fe(Ⅲ)can either be oxidized by Fe(Ⅱ)-oxidizing bacterium or reduced by Fe(Ⅲ)-reducing bacterium.In the present experiment,we hypothesized that the redox cycling of Fe(Ⅱ)and Fe(Ⅲ)in magnetite could serve as the electron donor and acceptor for methanogenesis.A methanogen enrichment was obtained from a natural wetland located in Tibetan Plateau.The molecular analysis of microbial community showed that the enrichment was exclusively dominated by Methanosarcina species.The determination of CH4 production and the change in Fe(Ⅱ)/Fe(Ⅲ)ratio revealed that the addition of magnetite nanoparticles accelerated CH4 production and magnetite possibly played a capacitor role for electron transfer in methanogenesis of the enrichment.
Hui Wang Yahai Lu
College of urban and enviormental sciences,Peking University 100871
国际会议
The 11th International Symposium on Geochemistry of the Earths Surface(GES-11)(第十一届地球表层地球化学国际研讨会)
贵阳
英文
1-3
2017-06-11（万方平台首次上网日期，不代表论文的发表时间）