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Gamma Ray Radiation Effect on Bi2WO6 Photocatalyst
Qiang Zhang,Zhi-wen Jiang,Mo-zhen Wang*,Xue-wu Ge*
Author NameAffiliationE-mail
Qiang Zhang CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China  
Zhi-wen Jiang CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China  
Mo-zhen Wang* CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China pstwmz@ustc.edu.cn 
Xue-wu Ge* CAS Key Laboratory of Soft Matter Chemistry, Department of Polymer Science and Engineering, University of Science and Technology of China, Hefei 230026, China xwge@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 was observed by SEM under γ-ray radiation. However, the XRD spectra of the irradiated Bi2WO6 nanocrystals showed the characteristic 2θ of (113) plane shifts slightly from 28.37° to 28.45° with the increase of the absorbed dose, confirming the change in the crystal structure of Bi2WO6. The XPS results proved the crystal structure change was originated from the generation of oxygen vacancy defects under high-dose radiation. The photocatalytic activity of Bi2WO6 on the decomposition of methylene blue (MB) in water under visible light increases gradually with the increase of absorbed dose. Moreover, the improved photocatalytic performance of the irradiated Bi2WO6 nanocrystals remained 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:
Bi2WO6光催化剂的γ射线辐射效应
张 强,姜志文,汪谟贞*,葛学武*
摘要:
本文首次研究了高能辐射(γ射线)对Bi2WO6纳米晶体结构和光催化性能的影响. 结果表明,尽管高能辐射不会改变Bi2WO6纳米晶体的形貌,但是Bi2WO6粉末的颜色在高吸收剂量辐照(507 kGy)后发生了明显的变化,并且辐照后Bi2WO6的XRD谱图也显示,随着吸收剂量的增加,(113)晶面对应的2θ从28.37°移到28.45°,说明晶格参数在γ射线辐照下还是发生了细微的变化. XPS表征结果证明,Bi2WO6晶体结构的变化源于高剂量辐射下氧空位缺陷的产生. Bi2WO6纳米晶体的禁带宽度(Eg)随吸收剂量的增加也出现减小的趋势. 用水溶液中亚甲基蓝的可见光照分解反应作为模型反应考察了辐照后的Bi2WO6纳米晶体的光催化活性,结果表明,辐照后的Bi2WO6纳米晶体的光催化活性随着吸收剂量的增加而逐渐升高. 将经过反应后的Bi2WO6纳米晶体再次回收,进行循环催化,发现这些辐照后的Bi2WO6纳米晶体在三次循环使用后光催化性能仍然能够保持,说明高能辐射产生的氧空位缺陷具有良好的稳定性.
关键词:  钨酸铋,伽马射线,氧空位,可见光催化剂
DOI:10.1063/1674-0068/31/cjcp1805094
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