Redox Conversion of Arsenite and Nitrate in the UV/Quinone Systems

Whether superoxide radical anion (O2 •–) was a key reactive species in the oxidation of arsenite (As­(III)) in photochemical processes has long been a controversial issue. With hydroquinone (BQH2) and 1,4-benzoquinone (BQ) as redox mediators, the photochemical oxidation of As­(III) and reduction of...

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Bibliographic Details
Published in:Environmental science & technology 2018-09, Vol.52 (17), p.10011-10018
Main Authors: Chen, Zhihao, Jin, Jiyuan, Song, Xiaojie, Zhang, Guoyang, Zhang, Shujuan
Format: Article
Language:English
Subjects:
Aquatic environment
Arsenite
Benzoquinone
Conversion
Disproportionation
Electron transfer
Free radicals
Hydrogen peroxide
Hydroquinone
Hydroxyl radicals
Nitrates
Oxidation
Photochemicals
Photochemistry
Photolysis
Quinones
Reduction
Scavenging
Singlet oxygen
Species
Superoxide
Synergistic effect
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Summary:Whether superoxide radical anion (O2 •–) was a key reactive species in the oxidation of arsenite (As­(III)) in photochemical processes has long been a controversial issue. With hydroquinone (BQH2) and 1,4-benzoquinone (BQ) as redox mediators, the photochemical oxidation of As­(III) and reduction of nitrate (NO3 –) was carefully investigated. O2 •–, singlet oxygen (1O2), H2O2, and semiquinone radical (BQH•) were all possible reactive species in the irradiated system. However, since the formation of As­(IV) is a necessary step in the oxidation of As­(III), taking the standard reduction potentials into account, the reactions between the above species and As­(III) were thermodynamically unfavorable. On the basis of radical scavenging experiments, hydroxyl radical (•OH) was proved as the key species that led to the oxidation of As­(III) in the UV/BQH2 system. It should be noted that the •OH radicals were generated from the photolysis of H2O2, which came from the disproportionation of O2 •– and the reaction of O2 •– with BQH2. Both the photoejected e aq – from 1(BQH2)* and the direct electron transfer with 3(BQH2)* contributed to the reduction of NO3 – in the UV/BQH2 process. No synergistic effect was observed in the redox conversion of As­(III) and NO3 –, further demonstrating that the role of BQH• was negligible in the studied systems. The results here are helpful for a better understanding of the photochemical behaviors of quinones in the aquatic environment.
ISSN:0013-936X
1520-5851
DOI:10.1021/acs.est.8b03538