Ceria accelerated nanoscale zerovalent iron assisted heterogenous Fenton oxidation of tetracycline

Nuanqin ZHANG, Junyi CHEN, Zhanqiang FANG, Po Keung Eric TSANG

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13 Citations (Scopus)

Abstract

The development of an ultra-efficient heterogeneous Fenton catalyst that has practical application and can be easily separated is of great importance. In this study, a novel nanocomposite, Fe⁰/CeO₂, was successfully synthesised and applied for Fenton oxidation of tetracycline. The results show that Fe⁰/CeO₂ significantly enhanced the removal of pollutants, which suggests a synergistic effect between nanoscale zero-valent iron and CeO₂. Furthermore, the composite catalyst exhibited ideal reusability and wide pH adaptation. A radical identification experiment revealed that surface-bounded OH (OHads) played a critical role in Fenton reaction, and compared with bare nanoscale zero-valent iron, Fe⁰/CeO₂ remarkably promoted the generation of OH in the Fenton system, mostly because CeO₂ not only increased the adsorption properties of the catalyst, it also accelerated electron transfer to promote the decomposition of H₂O₂ due to the abundance of surface oxygen vacancies. A reasonable degradation pathway was also proposed for tetracycline on the basis of the detected intermediates. Our findings help to understand the mechanism of tetracycline degradation by heterogeneous Fenton-like, and also provide an efficient system for organic wastewater treatment. Copyright © 2019 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)588-599
JournalChemical Engineering Journal
Volume369
Early online date13 Mar 2019
DOIs
Publication statusPublished - 01 Aug 2019

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Cerium compounds
Tetracycline
Iron
catalyst
oxidation
iron
Oxidation
Catalysts
Degradation
degradation
Reusability
Oxygen vacancies
Wastewater treatment
Nanocomposites
decomposition
Decomposition
adsorption
Adsorption
electron
oxygen

Citation

Zhang, N., Chen, J., Fang, Z., & Tsang, E. P. (2019). Ceria accelerated nanoscale zerovalent iron assisted heterogenous Fenton oxidation of tetracycline. Chemical Engineering Journal, 369, 588-599. doi: 10.1016/j.cej.2019.03.112

Keywords

  • Zero valent iron
  • Heterogeneous Fenton process
  • Tetracycline
  • Antibiotic