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Ice-templated synthesis of tungsten oxide nanosheets and their application in arsenite oxidation

Title
Ice-templated synthesis of tungsten oxide nanosheets and their application in arsenite oxidation
Author(s)
Nguyen, Anh Quoc KhuongKim, KitaeAhn, Yong-YoonKim, MinsunKim, GonuLee, Jeong TaeKim, SoonhyunKim, Jungwon
Issued Date
2023-03
Citation
Science of the Total Environment, v.865
Type
Article
Author Keywords
Ice particle templateWO3 nanosheetAs(III) oxidationH2O2 activationHydroperoxyl radical
ISSN
0048-9697
Abstract
Tungsten oxide (WO3) nanosheets were prepared as catalysts to activate hydrogen peroxide (H2O2) in arsenite (As(III)) oxidation. Ice particles were employed as templates to synthesize the WO3 nanosheets, enabling easy template removal via melting. Transmission electron microscopy and atomic force microscopy revealed that the obtained WO3 nanosheets were plate-like, with lateral sizes ranging from dozens of nanometers to hundreds of nanometers and thicknesses of <10 nm. Compared to that of the WO3 nanoparticle/H2O2 system, a higher efficiency of As(III) oxidation was observed in the WO3 nanosheet/H2O2 system. Electron spin resonance spectroscopy, radical quenching studies, and As(III) oxidation experiments under anoxic conditions suggested that the hydroperoxyl radical (HO2●) acted as the primary oxidant. The WO3 nanosheets possessed numerous surface hydroxyl groups and electrophilic metal centers, enhancing the production of HO2● via H2O2 activation. Various anions commonly present in As(III)-contaminated water exhibited little effect on As(III) oxidation in the WO3 nanosheet/H2O2 system. The high oxidation efficiency was maintained by adding H2O2 when it was depleted, suggesting that the catalytic activity of the WO3 nanosheets did not deteriorate after multiple catalytic cycles. © 2022 Elsevier B.V.
URI
http://hdl.handle.net/20.500.11750/17504
DOI
10.1016/j.scitotenv.2022.161104
Publisher
Elsevier B.V.
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Appears in Collections:
Division of Energy Technology 1. Journal Articles

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