Insight into the influence of pyrolysis temperature on Fenton-like catalytic performance of magnetic biochar

Yunqiang YI, Guoquan TU, Po Keung Eric TSANG, Zhanqiang FANG

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2 Citations (Scopus)

Abstract

The effects of the pyrolysis temperature on the Fenton-like catalytic performance of magnetic biochar remain unclear. In this study, magnetic biochar (SMBC300, SMBC400, SMBC500) was synthesised at various temperature (300 °C, 400 °C and 500 °C) and used for the Fenton-like degradation of metronidazole. The characterisation results demonstrated the similarity of functional groups and the species of iron oxides in three types of magnetic biochar. Moreover, the size distribution of iron oxides in these composites were obviously affected by the pyrolysis temperature. Metronidazole was rapidly and completely degraded by SMBC400 coupled with H₂O₂, and its kinetic rate constant was approximately 1.86 and 3.04 times higher than those of SMBC300 and SMBC500, respectively. Electron spin resonance and free radical quenching experiments showed that obvious differences in the ability of three types of magnetic biochar can heterogeneously activate H₂O₂ to generate OH, and that surface-bound OH plays a key role in the degradation of metronidazole. The differences in Fe (II) content among the types of magnetic biochar were the main reason for the differences in catalytic performance. The degradation of metronidazole by various species of iron oxides showed that FeO was the key component in the catalytic performance of magnetic biochar. This study confirms that magnetic biochar prepared at 400 °C has the best performance in the Fenton-like degradation of metronidazole. Copyright © 2019 Elsevier B.V. All rights reserved.
Original languageEnglish
Article number122518
JournalChemical Engineering Journal
Volume380
Early online dateAug 2019
DOIs
Publication statusPublished - Jan 2020

Fingerprint

pyrolysis
Pyrolysis
Metronidazole
Iron oxides
iron oxide
Degradation
degradation
temperature
Temperature
free radical
electron spin resonance
Free radicals
Functional groups
functional group
Paramagnetic resonance
Quenching
Rate constants
kinetics
Kinetics
biochar

Citation

Yi, Y., Tu, G., Tsang, P. E., & Fang, Z. (2020). Insight into the influence of pyrolysis temperature on Fenton-like catalytic performance of magnetic biochar. Chemical Engineering Journal, 380. Retrieved from https://doi.org/10.1016/j.cej.2019.122518

Keywords

  • Fenton-like
  • Magnetic biochar
  • Iron-based material
  • Steel pickling waste liquor
  • Antibiotics