Degradation of metronidazole by dielectric barrier discharge in an aqueous solution

Highlights

The discharge characteristics during the degradation of MNZ by DBD were investigated.

Increasing the discharge frequency can promote the degradation of MNZ.

MNZ removal reaches 99.1% at the initial concentration of 40 ppm within 120 min.

Coexisting organic matter inhibits the degradation of MNZ.

The energy efficiency of DBD for MNZ removal is higher than other technologies.

Abstract

Degradation of metronidazole (MNZ) which is a representative and stable antibiotic by dielectric barrier discharge (DBD) in an aqueous solution has been studied. Effects of initial MNZ concentration, solution pH and coexisting organics on the degradation were investigated. The results illustrated that increasing the input power and the discharge frequency can improve the removal of MNZ. At low initial concentration, the removal of MNZ can reach up to 99.1%. Acidic and neutral conditions are more favorable for MNZ removal than alkaline condition in the early stage of degradation. However, the difference in MNZ removal between those in acidic or neutral media and that in alkaline one could be neglected with prolonging of the treatment time. Therefore, this method can be applied to MNZ degradation with a wide pH range. Coexisting organic matter in water can attenuate the removal to some extent. This study could provide valuable references for the degradation of nitroimidazole antibiotics by DBD.

Graphical abstract

Keywords

Dielectric barrier discharge / Antibiotic / Metronidazole / Water treatment

References

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Acknowledgements

This work was supported by the Fujian Science and Technology Plan Project (No. 2019H0036) the Science and Technology Program of Xiamen (No. 3502Z20183041), the Climbing Program for Research of Xiamen University of Technology (No. XPDKT18011), the Graduate Technology Innovation Project (No. YKJCX2018) and College Students Innovation Training Program (No. 201811062048) of Xiamen University of Technology.

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