Power Production and Degradation of Pesticide Wastewater Through Microbial Fuel Cells with the Modified Activated Carbon Air Cathode by Hollow-Carbon and Carbon-Encapsulated Structures

Microbial fuel cell (MFC) can degrade pesticide wastewater and recovery energy simultaneously, and the activated carbon (AC) air cathode has great prospects for practical application. However, insufficient active sites and the limitation of multi-step electron transfer for oxygen reduction reaction...

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Published in:Molecules (Basel, Switzerland) Switzerland), 2024-11, Vol.29 (23), p.5675
Main Authors: Zhang, Xueli, Jia, Linhui, Liu, Yu, Wang, Ziqi, Qin, Jumiao, Wang, Qiuhong, Zhao, Xiao, Zhong, Ming, Lang, Jianfeng, Xu, Guangri, Wu, Yanbing, Cui, Chengxing
Format: Article
Language:English
Subjects:
Activated carbon
Atoms & subatomic particles
Catalysis
Design
Efficiency
Electron transport
Energy
Force and energy
Fuel cell industry
Fuel cells
Herbicides
metal-organic framework
Metals
microbial fuel cell
Microorganisms
Organic chemicals
oxygen reduction reaction
pesticide degradation
Pesticides
Pollutants
Wastewater
Zeolites
Zinc compounds
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Summary:Microbial fuel cell (MFC) can degrade pesticide wastewater and recovery energy simultaneously, and the activated carbon (AC) air cathode has great prospects for practical application. However, insufficient active sites and the limitation of multi-step electron transfer for oxygen reduction reaction (ORR) requires that AC should be modified by highly efficient electrocatalysts. Herein, busing the confinement effect of carbon-encapsulated metal and hollow carbon, we designed a unique ORR catalyst of Fe-Fe O -NC through utilizing the 2D leaf-like nanoplates of Zn-ZIF-L to load Prussian blue (PB) particles. The volatilization of low-boiled Zn and the catalysis of iron compounds led to the formation of confined walls of hollow carbon shell and carbon-encapsulated Fe/Fe O particles on N-doped carbon substrate. Multivalent iron, a large surface area (368.11 m ·g ), N doping, a heterojunction interface, and the confinement effect provided all the Fe-Fe O -NC-modified AC air cathodes with excellent ORR activity. The optimal samples of AC-Fe-Fe O -NC-3 achieved a peak power density of 1213.8 mW·m , demonstrating a substantial 82.8% increase over that of the bare AC. Furthermore, its efficiency in glyphosate removal reached 80.1%, surpassing the 23.2% of the bare AC. This study offers new ideas in constructing composite confined structures and the as-designed Fe-Fe O -NC is a promising modification candidate for the commercial adoption of AC air cathodes.
ISSN:1420-3049
1420-3049
DOI:10.3390/molecules29235675