New insight to piezocatalytic peroxymonosulfate activation: The critical role of dissolved oxygen in mediating radical and nonradical pathways
Date
2022
Authors
Nie, G.
Xiao, L.
Bi, J.
Wang, S.
Duan, X.
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Applied Catalysis B: Environmental, 2022; 315:1-9
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Gang Nie, Ling Xiao, Jingxiu Bi, Shaobin Wang, Xiaoguang Duan
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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 ( 1 O2) are the primary ROS in the US/MoS2/PMS system. Particularly, O2 is a vital intermediate for 1 O2 generation, and multiple formation pathways of 1 O2 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 1 O2 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.
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© 2022 Elsevier B.V. All rights reserved.