Citation: WU Da-Wang, LI Shuo, CHEN Yao-Qiang, NG Mao-Chu, ZHANG Qiu-Lin, LIU Kang-Lian, WANG Yu-Lin. Photocatalytic Degradation of Gas Phase Benzene over WO3/Bi12SiO20[J]. Acta Physico-Chimica Sinica, ;2010, 26(12): 3299-3304. doi: 10.3866/PKU.WHXB20101139
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WO3 and Bi12SiO20 powders were prepared by a gas-liquid reaction and chemical solution decomposition, respectively. WO3/Bi12SiO20 photocatalysts were coupled by mixing WO3 and Bi12SiO20. The reduction of benzene was used to investigate the activity of WO3/Bi12SiO20. The results indicate that the activity of the coupled WO3/Bi12SiO20 catalysts increased substantially. The degradation behavior of benzene over 30%(w) WO3/Bi12SiO20 under UV irradiation was obviously better than that of P-25, and the degradation of benzene under visible light was also considerable. The photocatalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS). The results showed that there was a od synergistic effect between WO3 and Bi12SiO20. The photogenerated electrons and holes were effectively separated after coupling between WO3 and Bi12SiO20 and the rate of electron and hole production increased. The electrons and holes were effectively separated and the photocatalytic activity increased accordingly.
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Keywords:
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Coupling
, - Photocatalysis,
- Degradation,
- Gas benzene
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