Journal
GEODERMA
Volume 352, Issue -, Pages 181-184Publisher
ELSEVIER
DOI: 10.1016/j.geoderma.2019.05.044
Keywords
Electron shuttle; Feammox; Graphene; Mangrove sediment; N-15-isotope
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Funding
- National Key R&D Program of China [2016YFC0502901]
- National Natural Science Foundation of China [51808473]
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Graphene is a one-atom-thick sheet, possessing a high electron mobility, constructed from sp(2)-bonded carbon atoms. Here, we hypothesize that graphene functions as a conductive material to promote anaerobic ammonium oxidation coupled with Fe(III) reduction (Feammox) in mangrove sediments slurries. In this study, graphene and 9,10-anthraquinone-2-sulfonate (AQS) were both investigated using a nitrogen isotope tracing technique. Graphene and AQS addition increased the Feammox rates by 31% and 56%. Graphene also increased the Fe(III) reduction rate by 43%, but Feammox-associated Fe(III) reduction accounted for only 1.5-4.9% of the total Fe(III) reduction. Graphene may have behaved as a conductive bridge to promote electron transfer to the Fe(III) acceptor in the Feammox process; however, the mechanisms by which graphene and AQS stimulate Feammox are different.
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