Enhanced degradation of chloramphenicol via heterogeneous activation of peroxymonosulfate by Fe3O4 and gallic acid

Yang Li; Liurui Xiang; Linyi Li; Xinyi Gu; Wenbo Dong; Yanlin Wu

doi:10.1016/j.chemosphere.2023.140376

Enhanced degradation of chloramphenicol via heterogeneous activation of peroxymonosulfate by Fe₃O₄ and gallic acid

Chemosphere. 2023 Dec:344:140376. doi: 10.1016/j.chemosphere.2023.140376. Epub 2023 Oct 6.

Authors

Yang Li¹, Liurui Xiang¹, Linyi Li¹, Xinyi Gu¹, Wenbo Dong¹, Yanlin Wu²

Affiliations

¹ Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science & Engineering, Fudan University, Shanghai, 200433, China.
² Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science & Engineering, Fudan University, Shanghai, 200433, China. Electronic address: wuyanlin@fudan.edu.cn.

PMID: 37806327
DOI: 10.1016/j.chemosphere.2023.140376

Abstract

In this study, we demonstrated the effective degradation of wide-spectrum antibiotic chloramphenicol (CAP) by Fe₃O₄/peroxymonosulfate (PMS) system modified by gallic acid (GA). GA/Fe3O4/PMS showed a substantially higher degradation rate (77.6%) than Fe₃O₄/PMS (8.3%). The active components were detected by electron spin-resonance spectroscopy (ESR) and the quenching experiments. The results showed that the hydroxyl radical (HO^•) was the main reason for the degradation of CAP. In the GA/Fe₃O₄/PMS system, the trace amount of dissolved iron ion were not the main species that activated PMS. Surface characterization and theoretical simulations showed that Fe atoms on Fe₃O₄ were responsible for PMS activation rather than a homogenous reaction. Five probable CAP degradation pathways were identified by density functional theory (DFT) calculations and liquid-phase mass spectrometry. Finally, the reusability of Fe₃O₄ was measured, and the GA/Fe₃O₄/PMS system maintained high efficiency after 5 times applications. The total organic carbon (TOC) removal rate reached 46.5% after reacting for 12 h. The gallic acid effectively promotes the circulation of Fe(II)/Fe(III) on solid surfaces and enhanced the degradation capacity of the original system. The research proposed a new way of directly employing plant polyphenols to boost the degradation ability of contaminants in heterogeneous systems.

Keywords: Fe(III)/Fe(II) cycle; PMS; Plant polyphenol; Surface reaction.

MeSH terms

Chloramphenicol*
Ferric Compounds*
Iron
Peroxides / chemistry

Substances

peroxymonosulfate
Ferric Compounds
Chloramphenicol
Peroxides
Iron