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Gamma Ray Radiation Effect on Bi2WO6 Photocatalyst
Wang Mo-Zhen
Author NameAffiliationE-mail
Wang Mo-Zhen University of Science and Technology of China pstwmz@ustc.edu.cn 
Abstract:
The development of Bi2WO6-based materials has become one of research hotspots due to the increasing demands on high-efficient photocatalyst responding to visible light. In this work, the effect of high energy radiation (γ-ray) on the structure and the photocatalytic activity of Bi2WO6 nanocrystals was first studied. No morphological change of Bi2WO6 nanocrystals can be observed by SEM under γ-ray radiation. However, the XRD spectra of the irradiated Bi2WO6 nanocrystals show the characteristic 2? of (113) plane shifts slightly from 28.37o to 28.45o with the increase of the absorbed dose, confirming the change in the crystal structure of Bi2WO6. The XPS results proved the crystal structure change is originated from the generation of oxygen vacancy defects under high-dose radiation. Along with the change in the crystal structure, the photocatalytic activity of Bi2WO6 on the decomposition of methylene blue (MB) in water under visible light increases gradually with the absorbed dose. Moreover, the improved photocatalytic performance of the irradiated Bi2WO6 nanocrystals remains after three cycles of photocatalysis, indicating a good stability of the created oxygen vacancy defects. This work gives a new simple way to improve photocatalytic performance of Bi2WO6 through creating oxygen vacancy defects in the crystal structure by γ-ray radiation.
Key words:  Bi2WO6, Gamma ray, Oxygen vacancy, Visible-light photocatalyst
FundProject:
Gamma Ray Radiation Effect on Bi2WO6 Photocatalyst
汪谟贞
摘要:
The development of Bi2WO6-based materials has become one of research hotspots due to the increasing demands on high-efficient photocatalyst responding to visible light. In this work, the effect of high energy radiation (γ-ray) on the structure and the photocatalytic activity of Bi2WO6 nanocrystals was first studied. No morphological change of Bi2WO6 nanocrystals can be observed by SEM under γ-ray radiation. However, the XRD spectra of the irradiated Bi2WO6 nanocrystals show the characteristic 2? of (113) plane shifts slightly from 28.37o to 28.45o with the increase of the absorbed dose, confirming the change in the crystal structure of Bi2WO6. The XPS results proved the crystal structure change is originated from the generation of oxygen vacancy defects under high-dose radiation. Along with the change in the crystal structure, the photocatalytic activity of Bi2WO6 on the decomposition of methylene blue (MB) in water under visible light increases gradually with the absorbed dose. Moreover, the improved photocatalytic performance of the irradiated Bi2WO6 nanocrystals remains after three cycles of photocatalysis, indicating a good stability of the created oxygen vacancy defects. This work gives a new simple way to improve photocatalytic performance of Bi2WO6 through creating oxygen vacancy defects in the crystal structure by γ-ray radiation.
关键词:  Bi2WO6, Gamma ray, Oxygen vacancy, Visible-light photocatalyst
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