Evolution of Singlet Oxygen by Activating Peroxydisulfate and Peroxymonosulfate: A Review

Guangfeng Xiao, Tiantian Xu, Muhammad Faheem, Yanxing Xi, Ting Zhou, Haseeb Tufail Moryani, Jianguo Bao and Jiangkun Du
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Guangfeng Xiao: School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
Tiantian Xu: School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
Muhammad Faheem: School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
Yanxing Xi: School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
Ting Zhou: School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
Haseeb Tufail Moryani: School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
Jianguo Bao: School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
Jiangkun Du: School of Environmental Studies, China University of Geosciences, Wuhan 430074, China

IJERPH, 2021, vol. 18, issue 7, 1-27

Abstract: Advanced oxidation processes (AOPs) based on peroxydisulfate (PDS) or peroxymonosulfate (PMS) activation have attracted much research attention in the last decade for the degradation of recalcitrant organic contaminants. Sulfate (SO 4 •? ) and hydroxyl ( • OH) radicals are most frequently generated from catalytic PDS/PMS decomposition by thermal, base, irradiation, transition metals and carbon materials. In addition, increasingly more recent studies have reported the involvement of singlet oxygen ( 1 O 2 ) during PDS/PMS-based AOPs. Typically, 1 O 2 can be produced either along with SO 4 •? and • OH or discovered as the dominant reactive oxygen species (ROSs) for pollutants degradation. This paper reviews recent advances in 1 O 2 generation during PDS/PMS activation. First, it introduces the basic chemistry of 1 O 2 , its oxidation properties and detection methodologies. Furthermore, it elaborates different activation strategies/techniques, including homogeneous and heterogeneous systems, and discusses the possible reaction mechanisms to give an overview of the principle of 1 O 2 production by activating PDS/PMS. Moreover, although 1 O 2 has shown promising features such as high degradation selectivity and anti-interference capability, its production pathways and mechanisms remain controversial in the present literatures. Therefore, this study identifies the research gaps and proposes future perspectives in the aspects of novel catalysts and related mechanisms.

Keywords: singlet oxygen; peroxydisulfate; peroxymonosulfate; activation; organic contaminants; degradation (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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