Degradation of COD in antibiotic wastewater by a combination process of electrochemistry, hydroxyl-functionalized ball-milled zero-valent iron/Fe3O4 and Oxone

In this study, the significant iron-based material, hydroxyl-functionalized ball-milled zero-valent iron/Fe3O4 (HFB-ZVI/Fe3O4) was employed for the experiments. The performance of the Electro + HFB-ZVI/Fe3O4 + Oxone system for the degradation of chemical oxygen demand (COD) in antibiotic wastewater...

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Bibliographic Details
Published in:Environmental technology 2024-03, Vol.45 (7), p.1259-1270
Main Authors: Wang, Chun-Feng, Li, Yue-Yi, Li, Ai-Hong, Yang, Nan, Wang, Xiao-Wen, Li, Yin-Ming, Zhang, Ye
Format: Article
Language:English
Subjects:
Antibiotics
Ball milling
Cathodes
Chemical degradation
Chemical oxygen demand
COD degradation
Degradation
Direct current
Dosage
Electric currents
Electrochemistry
electrolysis
Free radicals
HFB-ZVI/Fe
Hydroxyl radicals
Iron oxides
Oxidants
Oxidation
Oxidation process
Oxidizing agents
Oxone
pH effects
radicals quenching
Wastewater treatment
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Summary:In this study, the significant iron-based material, hydroxyl-functionalized ball-milled zero-valent iron/Fe3O4 (HFB-ZVI/Fe3O4) was employed for the experiments. The performance of the Electro + HFB-ZVI/Fe3O4 + Oxone system for the degradation of chemical oxygen demand (COD) in antibiotic wastewater was investigated. A direct current was applied between a graphite plate anode and two iron plate cathodes, and a series of operational parameters, such as applied electric current, the dosage of HFB-ZVI/Fe 3 O 4 composite, the dosage of Oxone, and initial solution pH, were explored to evaluate the oxidation process. The application of electric current enhanced the gradual degradation of COD and the increase of current intensity accelerated COD degradation. The neutral condition was favourable for the rapid degradation of COD in a short reaction time by the Electro + HFB-ZVI/Fe3O4 + Oxone process and promoted the degradation efficiency of COD. An increase of electric current gradually decreased the reaction solution pH, the larger the electric current applied in the reaction process, the lower the final pH of the reaction solution. Under the optimal experimental conditions (1 g/L HFB-ZVI/Fe 3 O 4 composite, 0.3 g/L Oxone, current intensity = 500 mA, initial solution pH = 7.85), Electro + HFB-ZVI/Fe3O4 + Oxone achieved 99% COD degradation in antibiotic wastewater. Radicals quenching experiments indicated the contribution to COD degradation by hydroxyl radicals (HO * ), sulphate radicals (SO 4 *- ) and other oxidants were 66.03%, 24.014% and 9.756%, respectively. The possible mechanism of COD degradation in the Electro + HFB-ZVI/Fe3O4 + Oxone system was also discussed in this study. The findings in this work provided useful information for the treatment of wastewater.
ISSN:0959-3330
1479-487X
DOI:10.1080/09593330.2022.2141661