Effect and mechanism of norfloxacin removal by guava leaf extract in the ZVI/H₂O₂ system

Baizhou LU, Zhanqiang FANG, Po Keung Eric TSANG, Jinhua WU

Research output: Contribution to journalArticlespeer-review

4 Citations (Scopus)

Abstract

To overcome the bottlenecks of the conventional zero-valent iron Fenton-like (ZVI/H₂O₂) process, such as low reagent utilization, low applicable pH, and iron sludge contamination, guava leaf extract (GLE) was used as a green promoter to enhance ZVI/H₂O₂ process in this study. Compared with the ZVI/H₂O₂ system, the removal rate and kobs of norfloxacin by the ZVI/H₂O₂/GLE system were increased by 33.76% and 2.19 times, respectively. The experimental investigation of the mechanism showed that the attack of reactive oxygen species was the main pathway for the removal of pollutants, and three types of reactive oxygen species (¹O₂, O₂⁻,·OH) generations in the ZVI/H₂O₂/GLE system were effectively promoted by the introduction of GLE. The reactivity improvement was mainly due to the decrease of pH. At the same time, the chelation of iron ions by GLE promoted the Fe(III)/Fe(II) cycle on the catalyst surface was also a minor mechanism to improve the reactivity. This study provides a crucial reference for the practical application of guava leaf to promote the ZVI/H₂O₂ process in environmental pollution control. Copyright © 2023 Elsevier Ltd. All rights reserved.
Original languageEnglish
Article number137801
JournalChemosphere
Volume316
Early online dateJan 2023
DOIs
Publication statusPublished - Mar 2023

Citation

Lu, B., Fang, Z., Tsang, P. E., & Wu, J. (2023). Effect and mechanism of norfloxacin removal by guava leaf extract in the ZVI/H₂O₂ system. Chemosphere, 316. Retrieved from https://doi.org/10.1016/j.chemosphere.2023.137801

Keywords

  • Zero-valent iron
  • Fenton-like
  • Guava leaf
  • Plant extract
  • Mechanism

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