Electrochemical degradation of the antibiotic metronidazole in aqueous solution by the Ti/SnO₂–Sb–Ce anode

Wan CHENG, Man YANG, Yingying XIE, Zhanqiang FANG, Junmin NAN, Po Keung Eric TSANG

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Abstract

Metronidazole (MNZ) is an antibiotic pollutant with a high occurrence in the ambient medium. In this study, the anode material Ti/SnO₂–Sb–Ce prepared in the lab was employed to investigate the feasibility of the electrochemical process to treat antibiotic in wastewater. The result showed that metronidazole could be effectively removed using Ti/SnO₂–Sb–Ce. The degradation efficiency of 88% was obtained under the current density 1.6 mA cm⁻², pH=5.6 (not adjusted), electrolyte (Na₂SO₄) concentration of 0.2 M for electrolysis 2 h. The removal percentage was higher by 17% compared with the control when the bare Ti was applied. Meanwhile, the energy consumption on Ti/SnO₂–Sb–Ce was about one-seventh of that on Ti. The characterization of the material was conducted by the thermal field emission scanning electron microscope (FE-SEM), energy-dispersive X-ray spectrometer (EDS) and cyclic voltammetry (CV). The Ti/SnO₂–Sb–Ce anode displayed compact, multi-porous morphology and good redox reversibility. The influencing factors such as current density, pH, concentration of Na₂SO₄, initial MNZ concentration were studied to obtain main factors and optimum conditions. In addition, a preliminary study on the mechanism of the electro-oxidation was carried out. The results demonstrate that chemisorbed oxygen has a dominant role in MNZ removal. Copyright © 2013 Taylor & Francis.
Original languageEnglish
Pages (from-to)2977-2987
JournalEnvironmental Technology
Volume34
Issue number21
DOIs
Publication statusPublished - May 2013

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Metronidazole
antibiotics
electrolyte
Anodes
aqueous solution
Anti-Bacterial Agents
Degradation
degradation
Electrolytes
electrokinesis
spectrometer
Current density
X ray spectrometers
wastewater
oxidation
electron
oxygen
pollutant
Electrooxidation
Electrolysis

Citation

Cheng, W., Yang, M., Xie, Y., Fang, Z., Nan, J., & Tsang, P. E. (2013). Electrochemical degradation of the antibiotic metronidazole in aqueous solution by the Ti/SnO₂–Sb–Ce anode. Environmental Technology, 34(21), 2977-2987.

Keywords

  • Electrochemical process
  • Metronidazole
  • Antibiotic
  • Degradation
  • SnO₂ anode