钴基气体扩散电极强化电芬顿处理磺胺噻唑钠

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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 CoO_x. 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.

Key words： electro-Fenton gas diffusion electrode antibiotic CoO_x oxidation efficiency

Received: 06 June 2022

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X703.1

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	Articles by authors
	XIE Jin-yu
	WANG Zhou-wen
	GAO Wei-jie
	DENG Feng-xia
	QIU Shan

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XIE Jin-yu,WANG Zhou-wen,GAO Wei-jie等. Cobalt-based gas diffusion electrodes enhance the E-Fenton for sulfathiazole sodium treatment[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(1): 122-131.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I1/122

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