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4 August 2021 2D/2D S-scheme photo-Fenton catalysts with large interfacial contact area for efficient photodegradation of pollutants
Haifeng Shi, Wenliang Wang
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Proceedings Volume 11800, Low-Dimensional Materials and Devices 2021; 1180007 (2021) https://doi.org/10.1117/12.2593639
Event: SPIE Nanoscience + Engineering, 2021, San Diego, California, United States
Abstract
In order to solve the problem of maintaining acidic environment and continuous loss of iron ions in traditional homogeneous Fenton reaction, an advanced photocatalytic-Fenton coupling system was developed on the basis of 2D/2D S-scheme Fe2O3/Bi2WO6 and Fe2O3/Bi2MoO6 catalysts fabricated by a facile hydrothermal method. X-ray diffraction, transmission electron microscopy and X-ray photoelectron spectroscopy analyses of the synthesized catalyst displayed that the hexagonal nanosheets of Fe2O3 were successfully deposited on Bi2WO6 and Bi2MoO6 nanosheets. Under visible light irradiation, the photo-Fenton catalytic activities of Fe2O3/Bi2WO6 and Fe2O3/Bi2MoO6 were significantly higher than those of individual components. By virtue of large surface area, adequate active sites and efficient charge transfer mechanism, the construction of 2D/2D Fe2O3/Bi2WO6 and Fe2O3/Bi2MoO6 heterojunction observably enhanced the separation efficiency of photogenerated carriers. Simultaneously, highly efficient charge mobility can lead to continuous Fe3+/Fe2+ conversion, promoting a cooperative effect between the photocatalysis and Fenton reaction. What’s more, a novel S-scheme model was proposed to expound the charge transfer process in the photo-Fenton catalytic reaction. We believe that Fe2O3/Bi2WO6 and Fe2O3/Bi2MoO6 composites can be a valuable guide for designing and constructing 2D/2D S-scheme heterojunction photo-Fenton catalysts.
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Haifeng Shi and Wenliang Wang "2D/2D S-scheme photo-Fenton catalysts with large interfacial contact area for efficient photodegradation of pollutants", Proc. SPIE 11800, Low-Dimensional Materials and Devices 2021, 1180007 (4 August 2021); https://doi.org/10.1117/12.2593639
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KEYWORDS
Heterojunctions
X-ray diffraction
Ions
Iron
Photocatalysis
Photoemission spectroscopy
Transmission electron microscopy
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