Citation: Bingkun Huang, Zelin Wu, Jing Zhang, Yanbiao Shi, Chuan-Shu He, Zhaokun Xiong, Bo Lai. Is the choice of quencher appropriate for exploring reactive oxygen species in advanced oxidation processes?[J]. Chinese Chemical Letters, ;2026, 37(3): 111537. doi: 10.1016/j.cclet.2025.111537 shu

Is the choice of quencher appropriate for exploring reactive oxygen species in advanced oxidation processes?

Bingkun Huang ^{a, b} ,
Zelin Wu ^{a, b} ,
Jing Zhang ^{a, b} ,
Yanbiao Shi ^{a, b} ,
Chuan-Shu He ^{a, b} ,
Zhaokun Xiong ^{a, b, *,} ,
Bo Lai ^{a, b}

a.
State Key Laboratory of Hydraulics and Mountain River Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China
b.
Sino-German Centre for Water and Health Research, Sichuan University, Chengdu 610065, China

scuxzk@scu.edu.cn

Received Date: 9 February 2025
Revised Date: 30 May 2025
Accepted Date: 2 July 2025
Available Online: 3 July 2025

Figures(5)

Quenching experiments play an essential role in the probing of reactive oxygen species (ROS) in advanced oxidation processes (AOPs). However, inappropriate choice of quencher type and concentration will affect the judgement of the contribution of ROS. Herein, we systematically explored the direct reaction of quenchers with oxidants commonly used in AOPs (e.g., hydrogen peroxide (H₂O₂), peroxymonosulfate (PMS), and peroxydisulfate (PDS)). The experimental results showed that PMS had a noticeable reaction with methyl phenyl sulfoxide, dimethyl sulfoxide and furfuryl alcohol, and the second-order reaction rate constants between them were measured. Meanwhile, PDS and H₂O₂ were hardly consumed in the presence of various quenchers. Moreover, high-performance liquid chromatography measurements demonstrated that L-histidine, benzoquinone, and phenol would have the artifact of rapid PMS depletion due to the limitations of the test method. Furthermore, in response to the problems with the quenching experiments, some suggestions for the selection of quencher type and concentration were presented. This work is of great reference value in guiding the appropriate selection of quenchers in AOPs, which in turn facilitates the accurate investigation of ROS and reaction mechanisms.
- Advanced oxidation processes,
- Radical scavenger,
- Peroxide,
- Second-order rate constants,
- Quencher selection
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