Fenton-Like Oxidation of Antibiotic Ornidazole Using Biochar-Supported Nanoscale Zero-Valent Iron as Heterogeneous Hydrogen Peroxide Activator

Yanchang Zhang; Lin Zhao; Yongkui Yang; Peizhe Sun

doi:10.3390/ijerph17041324

Fenton-Like Oxidation of Antibiotic Ornidazole Using Biochar-Supported Nanoscale Zero-Valent Iron as Heterogeneous Hydrogen Peroxide Activator

Int J Environ Res Public Health. 2020 Feb 19;17(4):1324. doi: 10.3390/ijerph17041324.

Authors

Yanchang Zhang¹, Lin Zhao², Yongkui Yang², Peizhe Sun²

Affiliations

¹ School of Chemical Engineering and Technology, Tianjin University, Tianjin 300350, China.
² School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China.

Abstract

Biochar (BC)-supported nanoscale zero-valent iron (nZVI-BC) was investigated as a heterogeneous Fenton-like activator to degrade the antibiotic ornidazole (ONZ). The characterization of nZVI-BC indicated that BC could enhance the adsorption of ONZ and reduce the aggregation of nZVI. Thus, nZVI-BC had a higher removal efficiency (80.1%) than nZVI and BC. The effects of parameters such as the nZVI/BC mass ratio, pH, H₂O₂ concentration, nZVI-BC dose, and temperature were systematically investigated, and the removal of ONZ followed a pseudo-second-order kinetic model. Finally, possible pathways of ONZ in the oxidation process were proposed. The removal mechanism included the adsorption of ONZ onto the surface of nZVI-BC, the generation of •OH by the reaction of nZVI with H₂O₂, and the oxidation of ONZ. Recycling experiments indicated that the nZVI-BC/H₂O₂ system is a promising alternative for the treatment of wastewater containing ONZ.

Keywords: biochar; nanoparticles; ornidazole; wastewater treatment.

Publication types

Research Support, Non-U.S. Gov't

MeSH terms

Adsorption
Anti-Bacterial Agents
Charcoal*
Hydrogen Peroxide
Iron
Ornidazole* / chemistry
Water Pollutants, Chemical*

Substances

Anti-Bacterial Agents
Water Pollutants, Chemical
biochar
Charcoal
Ornidazole
Hydrogen Peroxide
Iron