Efficient degradation of refractory pollutant in a microbial fuel cell with novel hybrid photocatalytic air-cathode: Intimate coupling of microbial and photocatalytic processes

TY - JOUR

T1 - Efficient degradation of refractory pollutant in a microbial fuel cell with novel hybrid photocatalytic air-cathode

T2 - Intimate coupling of microbial and photocatalytic processes

AU - Zhu, Qian

AU - Wang, Xiaoxuan

AU - Hu, Jingping

AU - Chen, Sijing

AU - Hu, Shaogang

AU - Wu, Yaqian

AU - Liu, Bingchuan

AU - Xiao, Keke

AU - Liang, Sha

AU - Yang, Jiakuan

AU - Hou, Huijie

N1 - Publisher Copyright: © 2021 Elsevier Ltd

PY - 2021/11

Y1 - 2021/11

N2 - A microbial fuel cell-photocatalysis system with a novel photocatalytic air-cathode (MFC-PhotoCat) was proposed for synergistic degradation of 2,4,6-trichlorophenol (TCP) with simultaneous electricity generation. Stable electricity generation of 350 mV was achieved during 130 days of operation. Besides, 50 mg L−1 TCP was completely degraded within 72 h, and the rate constant of 0.050 h−1 was 1.8-fold higher than MFC with air-cathode without N-TiO2 photocatalyst. Degradation pathway was proposed based on the intermediates detected and density functional theory (DFT) calculation, with two open-chain intermediates (2-chloro-4-keto-2-hexenedioic acid and hexanoic acid) detected. Furthermore, hierarchical cluster and PCoA revealed significant shifts of microbial community structures, with enriched exoelectrogen (55.2% of Geobacter) and TCP-degrading microbe (7.1% of Thauera) on the cathode biofilm as well as 61.8% of Pseudomonas in the culture solution. This study provides a promising strategy for synergic degradation of recalcitrant contaminants by intimate-coupling of MFC and photocatalysis.

AB - A microbial fuel cell-photocatalysis system with a novel photocatalytic air-cathode (MFC-PhotoCat) was proposed for synergistic degradation of 2,4,6-trichlorophenol (TCP) with simultaneous electricity generation. Stable electricity generation of 350 mV was achieved during 130 days of operation. Besides, 50 mg L−1 TCP was completely degraded within 72 h, and the rate constant of 0.050 h−1 was 1.8-fold higher than MFC with air-cathode without N-TiO2 photocatalyst. Degradation pathway was proposed based on the intermediates detected and density functional theory (DFT) calculation, with two open-chain intermediates (2-chloro-4-keto-2-hexenedioic acid and hexanoic acid) detected. Furthermore, hierarchical cluster and PCoA revealed significant shifts of microbial community structures, with enriched exoelectrogen (55.2% of Geobacter) and TCP-degrading microbe (7.1% of Thauera) on the cathode biofilm as well as 61.8% of Pseudomonas in the culture solution. This study provides a promising strategy for synergic degradation of recalcitrant contaminants by intimate-coupling of MFC and photocatalysis.

KW - 2,4,6-Trichlorophenol

KW - Air-cathode

KW - Microbial community

KW - Microbial fuel cell

KW - Photocatalysis

UR - http://www.scopus.com/inward/record.url?scp=85112537122&partnerID=8YFLogxK

U2 - 10.1016/j.biortech.2021.125717

DO - 10.1016/j.biortech.2021.125717

M3 - 文章

C2 - 34426232

AN - SCOPUS:85112537122

SN - 0960-8524

VL - 340

JO - Bioresource Technology

JF - Bioresource Technology

M1 - 125717

ER -