Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 781, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.146686
Keywords
Nanocomposites; Denitrification; Electrochemistry; Electron transfer; Extracellular polymeric substance
Categories
Funding
- National Primary Research & Development Plan [2018YFE0120300]
- National Natural Science Foundation of China [21777142, 22011530015]
- Zhejiang Shuren University Basic Scientific Research Special Funds [2020XZ012]
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Nanomaterials in contact with microbial membranes can accelerate denitrification processes by establishing a connection with the internal electron transfer chain of microorganisms. This study found that Pd-Fe/MWCNTs promote extracellular electron transfer in Alcaligenes sp.TB. The excellent electron exchange capacity of Pd-Fe/MWCNTs and the secretion of PN contribute to the occurrence of DEET process and electron transfer.
Nanomaterials which contacts microbial membranes for extracellular electron transfer, could establish a connection with the internal electron transfer chain of microorganisms. This characteristic could be employed to accelerate the denitrification process. In this study, the effect and mechanism of Pd-Fe/multi-walled carbon nanotubes (MWCNTs) on the extracellular electron transport behavior of Alcaligenes sp.TB was studied using electron transfer inhibitors and electrochemical methods. The main conclusions were as follows: the electron transfer site of Pd-Fe/MWCNTs was 266 mV, which was next to cytochrome c; the excellent electron exchange capacity of PdFe/MMWCNTs (Delta Ep = 734 mV) and the secretion of PN (33 mg/L) induced by Pd-Fe/MWCNTs both contributed to the occurrence of DEET process and promoted the electron transfer; the correlation between the electron mediator and the nitrate removal was analyzed were greater than 0.9731. (C) 2021 Elsevier B.V. All rights reserved.
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