Discrepant oxidation behavior of ferric ion and hydroxyl radical on syringic acid and vanillic acid in atmospheric Fenton-like system

Jie Zhao; Yu Wang; Huihui Liu; Yanlin Wu; Wenbo Dong

doi:10.1016/j.chemosphere.2021.132022

Discrepant oxidation behavior of ferric ion and hydroxyl radical on syringic acid and vanillic acid in atmospheric Fenton-like system

Chemosphere. 2022 Jan;287(Pt 1):132022. doi: 10.1016/j.chemosphere.2021.132022. Epub 2021 Aug 24.

Authors

Jie Zhao¹, Yu Wang¹, Huihui Liu¹, Yanlin Wu², Wenbo Dong³

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; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China. Electronic address: wuyanlin@fudan.edu.cn.
³ Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention, Department of Environmental Science & Engineering, Fudan University, Shanghai, 200433, China; Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China. Electronic address: wbdong@fudan.edu.cn.

PMID: 34464849
DOI: 10.1016/j.chemosphere.2021.132022

Abstract

Syringic acid (SA) and vanillic acid (VA) from biomass combustion are not only the potential sources of atmospheric brown carbon (BrC) but also the traceable markers of biomass burning in smoke particles. In this work, the Fenton-like oxidation in a mixed system containing SA and VA was studied under some typical conditions in atmospheric aqueous. The influence of scavenger, Fe³⁺ concentration, H₂O₂ concentration, SA concentration, pH and oxygen was discussed. Our results revealed that despite SA and VA have similar structures, Fe³⁺ and HO sever as their main oxidation sources, respectively. The addition of SA could heighten the HO yield obviously compared with conventional Fenton-like oxidation in atmospheric water, and this performance was attributed to the strong reducibility to Fe³⁺. In addition, SA accelerated the oxidation of VA and caused a 4.7-fold elevation in the initial rate. These results demonstrate that the process may change the amount of SA and VA and then disturb their mass ratio, which is important for aerosol source characterization work.

Keywords: Biomass burning; Fenton-like; Ferric ion; Syringic acid; Vanillic acid.

MeSH terms

Ferric Compounds
Gallic Acid / analogs & derivatives
Hydrogen Peroxide
Hydroxyl Radical*
Iron
Oxidation-Reduction
Vanillic Acid*

Substances

Ferric Compounds
Hydroxyl Radical
Gallic Acid
Hydrogen Peroxide
Iron
syringic acid
Vanillic Acid