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Aggregation-dependent electron transfer via redox-active biochar particles stimulate microbial ferrihydrite reduction

Title data

Yang, Zhen ; Sun, Tianran ; Subdiaga, Edisson ; Obst, Martin ; Haderlein, Stefan ; Maisch, Markus ; Kretschmar, Ruben ; Angenent, Largus T. ; Kappler, Andreas:
Aggregation-dependent electron transfer via redox-active biochar particles stimulate microbial ferrihydrite reduction.
In: Science of the Total Environment. Vol. 703 (February 2020) . - No. 135515.
ISSN 1879-1026
DOI: https://doi.org/10.1016/j.scitotenv.2019.135515

Abstract in another language

Microbial Fe(III) reduction plays an important role for biogeochemical carbon and iron cycling in sediments and soils. Biochar is used as a soil amendment to increase fertility and lower N2O/CO2 emissions. It is redox-active and can stimulate microbial Fe(III) mineral reduction. It is currently unknown, however, how the aggregation of cells and Fe(III) minerals with biochar particles influence microbial Fe(III) reduction. Therefore, we determined rates and extent of ferrihydrite (Fh) reduction in S. oneidensis MR-1 cell suspensions with different particles sizes of wood-derived Swiss biochar and KonTiki biochar at different biochar/Fh ratios. We found that at small biochar particle size and high biochar/Fh ratios, the biochar, MR-1 cells and Fh closely aggregated, therefore addition of biochar stimulated electron transfer and microbial Fh reduction. In contrast, large biochar particles and low biochar/Fh ratios inhibited the electron transfer and Fe(III) reduction due to the lack of effective aggregation. These results suggest that for stimulating Fh reduction, a certain biochar particle size and biochar/Fh ratio is necessary leading to a close aggregation of all phases. This aggregation favors electron transfer from cells to Fh via redox cycling of the electron donating and accepting functional groups of biochar and via direct electron transfer through conductive biochar carbon matrices. These findings improve our understanding of electron transfer between microorganisms and Fe(III) minerals via redox-active biochar and help to evaluate the impact of biochar on electron transfer processes in the environment.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER153681
Keywords: Biochar; Ferrihydrite; Dissimilatory iron reduction; Electron transfer; Redox mediator; Aggregation
Institutions of the University: Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Heisenberg Professorship - Experimental Biogeochemistry > Heisenberg Professorship - Experimental Biogeochemistry - Univ.-Prof. Dr. Martin Obst
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 27 Jan 2020 09:15
Last Modified: 27 Jan 2020 09:15
URI: https://eref.uni-bayreuth.de/id/eprint/53772