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Citation
Tags
HERO ID
7326068
Reference Type
Journal Article
Title
Formation and degradation mechanisms of CX3R-type oxidation by-products during cobalt catalyzed peroxymonosulfate oxidation: The roles of Co3+ and SO4·
Author(s)
Chen, T; Yu, Z; Xu, T; Xiao, R; Chu, W; Yin, D
Year
2021
Is Peer Reviewed?
Yes
Journal
Journal of Hazardous Materials
ISSN:
0304-3894
EISSN:
1873-3336
Publisher
Elsevier
Location
AMSTERDAM
Volume
405
Page Numbers
124243
Language
English
PMID
33109408
DOI
10.1016/j.jhazmat.2020.124243
Web of Science Id
WOS:000616143200003
Abstract
Sulfate radical (SO4·-)-based advanced oxidation processes (AOPs) attract increasing attention in the control of micropollutants. However, SO4·- can react with other chemicals present in water and result in undesired oxidation by-products (OBPs) generation. The formation and degradation mechanisms of CX3R-type OBPs during cobalt catalyzed peroxymonosulfate (Co2+/PMS) oxidation were investigated. In the formation of CX3R-type OBPs, both Co3+ and SO4·- could convert chloride to free chlorine that then reacted with natural organic matter, leading to the formation of CX3R-type OBPs. The concentrations of trichloromethane, chloral hydrate, dichloroacetonitrile, dichloroacetamide and trichloroacetamide after 15 min reaction were 9.8, 3.9, 1.2, 5.9 and 22.3 nM, respectively. Compared to SO4·-, Co3+ played a more significant role in the CX3R-type OBP formation and calculated toxicity values of CX3R-type OBPs. CX3R-type OBPs could not only be formed but also be degraded at the same time during Co2+/PMS oxidation. As for the degradation of CX3R-type OBPs, both Co3+ and SO4·- could transform CX3R-type OBPs to chloride. Compared to Co3+, SO4·- played a more important role in the degradation of CX3R-type OBPs and the conversion from chloride to final by-product chlorate. The adverse effects that results from Co3+ need more attention in SO4·--based AOPs application.
Keywords
SO4 center dot--based advanced oxidation processes; Free radical; CX3R-type oxidation by-products; Toxicity
Series
JOURNAL OF HAZARDOUS MATERIALS
Tags
IRIS
•
Chloroform Combined (current)
Chloroform (current)
Literature Search: April 2020 - February 2021
PubMed
•
Cobalt
LitSearch Update: January 2019 - December 2021
PubMed
WoS
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