期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 434, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.jhazmat.2022.128923
关键词
ORR-EO; Hydrogen peroxide; Refractory organics; Hydroxyl radicals; Singlet oxygen
资金
- National Natural Science Foundation of China [52070008]
In this study, MnO2 was introduced into the cathodic catalyst layer for in-situ H2O2 decomposition to generate active oxidation species. The ORR-EO system with MnO2/CNTs-C/PTFE air-cathode and Ti/NATO anode successfully eliminated organic carbon in the effluent and saved energy.
Recently, carbon nanotubes coated carbon black and polytetrafluoroethylene (CNTs-C/PTFE) gas diffusion electrode was used as an air-cathode in an electro-oxidation (EO) system for effectively generating hydrogen peroxide (H2O2) through a 2-electron oxygen reduction reaction (ORR). This ORR-EO system not only lowered applied voltage and conserved energy, but the synergistic peroxone (O-3/H2O2) reaction could increase hydroxyl radicals ((OH)-O-center dot) generation for organics elimination. However, a significant proportion of H2O2 was left in the effluent of ORR-EO, which was a loss of resources and energy. In this study, a Fenton-like reaction for in-situ H2O2 decomposition to generate active oxidation species was inserted by introducing MnO2 into the cathodic catalyst layer, and the sole MnO2/CNTs-C/PTFE air-cathode could accomplish 90% of phenol degradation. When MnO2/CNTs-C/PTFE air-cathode combined with Ti/NATO anode in an ORR-EO system, all anodic oxidation, Fenton-like reaction, and peroxone took place to successfully generate (OH)-O-center dot and singlet oxygen (O-1(2)). Over 95% of TOC in phenol and landfill leachate bio-effluent was effectively eliminated, with 20% energy savings compared to the ORR-EO with CNTs-C/PTFE air cathode.
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