Citation: SHENG Jia-Yi, LI Xiao-Jin, XU Yi-Ming. Effect of Sintering Temperature on the Photocatalytic Activity of Flower-Like Bi₂WO₆[J]. Acta Physico-Chimica Sinica, ;2014, 30(3): 508-512. doi: 10.3866/PKU.WHXB201312302 shu

Effect of Sintering Temperature on the Photocatalytic Activity of Flower-Like Bi₂WO₆

1.
State Key Laboratory of Silicon Materials, Department of Chemistry, Zhejiang University, Hangzhou 310027, P. R. China

Received Date: 22 November 2013
Available Online: 30 December 2013
Fund Project: 国家重点基础研究发展规划项目(973) (2009CB825300，2011CB936003)资助 (973) (2009CB825300，2011CB936003)

Bi₂WO₆ is reportedly active for the photocatalytic degradation of organic compounds in aerated aqueous solution, but factors influencing the photocatalytic activity of pristine Bi₂WO₆ have received little attention. In this study, the effect of sintering temperature on the physical properties of flower-like Bi₂WO₆ was investigated. The catalyst was synthesized through the hydrothermal reaction of Na₂WO₄ and Bi(NO₃)₃ at 160 ℃ for 20 h, followed by sintering in air at different temperatures for 3 h. Bi₂WO₆ samples were characterized with X-ray diffraction, scanning electron microscopy, and Raman, ultraviolet-visible diffuse reflectance, and photoluminescence spectroscopies. All samples had similar phase compositions and electronic structures. Samples exhibited different activities for the photocatalytic degradation of phenol in aerated aqueous solution, under ultraviolet light. With increasing Bi₂WO₆ sintering temperature, the rate of phenol degradation first increased and then decreased. The maximum rate of phenol degradation was observed from the catalyst sintered at 350 ℃. Similar results were obtained when the rate of phenol degradation was normalized with the specific surface area of the catalyst, as determined by N2 adsorption. The observed sintering temperature-dependent photoactivity of Bi₂WO₆ was attributed to a combination of its crystallinity, light absorption, and surface defects.
- Bismuth tungstate,
- Semiconductor,
- Photocatalysis,
- Phenol,
- Degradation
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Effect of Sintering Temperature on the Photocatalytic Activity of Flower-Like Bi2WO6

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通讯作者: 陈斌, bchen63@163.com

Effect of Sintering Temperature on the Photocatalytic Activity of Flower-Like Bi₂WO₆