Abstract：A cobalt oxide-doped carbon and nitrogen-based gas diffusion electrodes (Co-CN-GDE) were prepared, intending to enhance the degradation rate of antibiotic wastewater in the electro-Fenton process (EF). The interface reaction charge resistance of the Co-CN-GDE was reduced coupled with an enhancement of oxygen intensity after introduction of CoOx. It resulted in an obvious promotion of the active oxygen species, such as HO•. As the Co-CN-GDE EF was adapted to the treatment of sodium sulfathiazole (STZ) wastewater, the reaction kinetic constant increased from 0.008min-1 to 0.243min-1, and the degradation rate of STZ increased from 76.94% to 98.99% with the proportion of cobalt doping increased from 0 to 1/5 within 20min. Biotoxicity experiments proved that EF had a detoxifying effect. Finally, the intermediates of STZ were detected by Ultra performance liquid chromatography-mass spectrometry. Degradation of STZ were mainly through α, β, γ bond fracture. Therefore, this study provides a new idea to alleviate the slow iron reduction rate in micro-area strong alkali environment in EF, and further strengthen the ability of gas diffusion electrode to treat antibiotic wastewater.
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