Mechanism of quinone mediators modified polyurethane foam for enhanced nitrobenzene reduction and denitrification

Wenjie Xu; Xinyue Lu; Xiaohui Tang; Jin Xu; Zhengfang Ye

doi:10.1016/j.jhazmat.2023.131830

Mechanism of quinone mediators modified polyurethane foam for enhanced nitrobenzene reduction and denitrification

J Hazard Mater. 2023 Oct 5:459:131830. doi: 10.1016/j.jhazmat.2023.131830. Epub 2023 Jun 10.

Authors

Wenjie Xu¹, Xinyue Lu², Xiaohui Tang³, Jin Xu⁴, Zhengfang Ye⁵

Affiliations

¹ School of Environmental Engineering, Nanjing Institute of Technology, Nanjing 211167, China; Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China.
² Technical research and development center, CNOOC Gas and Power Group Co., Ltd, Beijing 100028, China.
³ No. 1 Engineering Design Institute, Academy of Environmental Planning and Design, Co., Ltd. Nanjing University, Nanjing 210003, China.
⁴ School of Environmental Engineering, Nanjing Institute of Technology, Nanjing 211167, China.
⁵ Department of Environmental Engineering, Peking University, The Key Laboratory of Water and Sediment Sciences, Ministry of Education, Beijing 100871, China. Electronic address: zhengfangye@163.com.

PMID: 37506643
DOI: 10.1016/j.jhazmat.2023.131830

Abstract

The nitrobenzene (NB) reduction and denitrification performance of the immobilized biofilm (I-BF) reactors based on 9,10-anthraquinone-2-sulfonyl chloride (ASC) modified polyurethane foam (PUF-ASC) carriers were investigated. Experiments demonstrated that the quinone mediators enhanced NB reduction and denitrification performance. The NB reduction rates increased by 1.46, while the NO₃^--N removal rates increased by 1.55 times in the PUF-0.1ASC system. The quinone mediators promote extracellular polymeric substances (EPS) secretion. Electrochemical tests indicated that quinone mediators enhanced the electron transfer of biofilm systems. NADH generation was accelerated and microbial electron transport system activity (ETSA) was promoted. The abundance of genera with electrochemical activity, NB degradation and denitrification ability (Pseudomonas sp., Diaphorobate sp., and Acinetobacter sp.) increased. Metabolic pathways relating to NO₃^--N and NB reduction were uploaded. In conclusion, electron acquisition by NO₃^--N and NB was facilitated, bacterial community structure and metabolic pathways were affected by the quinone mediators.

Keywords: Anaerobic biotransformation; Denitrification; Nitrobenzene; Quinone mediators modified polyurethane foam.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Benzoquinones*
Bioreactors
Denitrification*
Nitrobenzenes / chemistry
Nitrogen

Substances

polyurethane foam
quinone
Benzoquinones
9,10-anthraquinone
Nitrobenzenes
Nitrogen