A bio-electro-Fenton system with a facile anti-biofouling air cathode for efficient degradation of landfill leachate

TY - JOUR

T1 - A bio-electro-Fenton system with a facile anti-biofouling air cathode for efficient degradation of landfill leachate

AU - Wang, Dongliang

AU - Hou, Huijie

AU - Hu, Jingping

AU - Xu, Jikun

AU - Huang, Long

AU - Hu, Shaogang

AU - Liang, Sha

AU - Xiao, Keke

AU - Liu, Bingchuan

AU - Yang, Jiakuan

N1 - Publisher Copyright: © 2018 Elsevier Ltd

PY - 2019/1

Y1 - 2019/1

N2 - Bio-electro-Fenton (BEF) system holds great potential for sustainable degradation of refractory organics. Activated carbon (AC) air cathode was modified by co-pyrolyzing of AC with glucose and doping with nano-zero-valent iron (denoted as nZVI@MAC) in order to promote two-electron oxygen reduction reaction (2e− ORR) for enhanced oxidizing performance. Single chamber microbial fuel cells (SCMFCs) with nZVI@MAC cathode was examined to degrade landfill leachate. It was revealed that nZVI@MAC cathode SCMFC showed higher degradation efficiency towards landfill leachate. Six landfill leachate treatment cycles indicated that nZVI@MAC cathode SCMFC exhibited higher COD removal efficiencies over AC and nZVI@AC and greatly enhanced columbic efficiency compared to AC and nZVI@AC cathode. Anti-biofouling effect was found on nZVI@MAC cathode because of the high Fenton oxidation effects at the vicinity of the cathode. Electrochemical characterizations indicated that MAC cathode had superior 2e− ORR capability than AC and nZVI@AC cathode, which was further evidenced by higher H2O2 production from nZVI@MAC cathode in SCMFC. Graphitic structure of MAC was evidenced by High Resolution Transmission Electron Microscopy, and glucose pyrolysis also resulted in nano carbon spheres on the activated carbon skeletons. Raman spectra indicated more defects were generated on MAC during its co-pyrolyzation with glucose.

AB - Bio-electro-Fenton (BEF) system holds great potential for sustainable degradation of refractory organics. Activated carbon (AC) air cathode was modified by co-pyrolyzing of AC with glucose and doping with nano-zero-valent iron (denoted as nZVI@MAC) in order to promote two-electron oxygen reduction reaction (2e− ORR) for enhanced oxidizing performance. Single chamber microbial fuel cells (SCMFCs) with nZVI@MAC cathode was examined to degrade landfill leachate. It was revealed that nZVI@MAC cathode SCMFC showed higher degradation efficiency towards landfill leachate. Six landfill leachate treatment cycles indicated that nZVI@MAC cathode SCMFC exhibited higher COD removal efficiencies over AC and nZVI@AC and greatly enhanced columbic efficiency compared to AC and nZVI@AC cathode. Anti-biofouling effect was found on nZVI@MAC cathode because of the high Fenton oxidation effects at the vicinity of the cathode. Electrochemical characterizations indicated that MAC cathode had superior 2e− ORR capability than AC and nZVI@AC cathode, which was further evidenced by higher H2O2 production from nZVI@MAC cathode in SCMFC. Graphitic structure of MAC was evidenced by High Resolution Transmission Electron Microscopy, and glucose pyrolysis also resulted in nano carbon spheres on the activated carbon skeletons. Raman spectra indicated more defects were generated on MAC during its co-pyrolyzation with glucose.

KW - Bio-electro-Fenton

KW - COD removal

KW - Columbic efficiency

KW - Heterogeneous Fenton oxidation

KW - Landfill leachate

KW - Microbial fuel cell

UR - http://www.scopus.com/inward/record.url?scp=85056199433&partnerID=8YFLogxK

U2 - 10.1016/j.chemosphere.2018.10.018

DO - 10.1016/j.chemosphere.2018.10.018

M3 - 文章

C2 - 30316159

AN - SCOPUS:85056199433

SN - 0045-6535

VL - 215

SP - 173

EP - 181

JO - Chemosphere

JF - Chemosphere

ER -