New insight to piezocatalytic peroxymonosulfate activation: The critical role of dissolved oxygen in mediating radical and nonradical pathways
Nie, Gang 1Xiao, Ling 1Bi, Jingxiu 2Wang, Shaobin 2Duan, Xiaoguang2
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作者信息
1. Wuhan Univ
2. Univ Adelaide
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Abstract
This study leverages piezocatalysis to accelerate redox reactions in heterogeneous peroxymonosulfate (PMS) activation. We syntheized few-layered molybdenum disulfide (MoS2) nanosheets as the piezoelectric catalyst for ultrasonic vibration (US)-coupled PMS system toward enhanced pollutant abatement. Scavenger tests, dissolved oxygen (DO) exclusion experiment and electron paramagnetic resonance (EPR) identify that sulfate radical (SO4.-) and singlet oxygen (O-1(2)) are the primary ROS in the US/MoS2/PMS system. Particularly, O-2(.-) is a vital intermediate for O-1(2) generation, and multiple formation pathways of O-1(2) were proposed in the US/MoS2/PMS system. With the assistance of DO and ultrasound, the utilization efficiency and activity of PMS will be remarkably increased because the majority of PMS evolves into more reactive SO4.- and O-1(2) for pollutant degradation. This work not only provides mechanistic insights into the interconnected regimes of piezocatalysis and heterogeneous Fenton-like reactions, but also achieves high chemical efficiency for sustainable water remediation.
NSTL
Elsevier