BiVO4/FeOOH semiconductor-microbe interface for enhanced visible-light-driven biodegradation of pyridine

•Pyridine degradation was enhanced at light-excited semiconductor-microbe interface.•Pyridine was firstly reduced and then oxidized in the bio-photodegradation process.•Species related to pyridine degradation and electron transfer were enriched.•Photoholes were the main reactive species responsible...

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Bibliographic Details
Published in:Water research (Oxford) 2020-12, Vol.187, p.116464, Article 116464
Main Authors: Shi, Hefei, Jiang, Xinbai, Chen, Dan, Li, Yang, Hou, Cheng, Wang, Lianjun, Shen, Jinyou
Format: Article
Language:English
Subjects:
Electron acceptor
Photoelectron transfer
Photohole
Pyridine
Semiconductor-microbe interface
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Summary:•Pyridine degradation was enhanced at light-excited semiconductor-microbe interface.•Pyridine was firstly reduced and then oxidized in the bio-photodegradation process.•Species related to pyridine degradation and electron transfer were enriched.•Photoholes were the main reactive species responsible for bio-photodegradation.•EET efficiency was improved due to combination of biofilm and semiconductor. Pyridine, a highly toxic nitrogen-containing heterocyclic compound, is recalcitrant in the conventional biodegradation process. In this study, BiVO4/FeOOH semiconductor-microbe interface was developed for enhanced visible-light-driven biodegradation of pyridine, where the efficiencies of pyridine removal (100%), total organic carbon (TOC) removal (88.06±3.76%) and NH4+-N formation (84.51±8.95%) were remarkably improved, compared to the biodegradation system and photodegradation system. The electron transport system activity and photoelectrochemical analysis implied the significant improvement of photogenerated carriers transfer between microbes and semiconductors. High-throughput sequencing analysis suggested functional species related to pyridine biodegradation (Shewanella, Bacillus and Lysinibacillus) and electron transfer (Shewanella and Tissierella) were enriched at the semiconductor-microbe interface. The light-excited holes played a crucial role in promoting pyridine mineralization. This study demonstrated that this bio-photodegradation system would be a potential alternative for the efficient treatment of wastewater containing recalcitrant pollutant such as pyridine. [Display omitted]
ISSN:0043-1354
1879-2448
DOI:10.1016/j.watres.2020.116464