Specific Analyses of the Active Species on Zn0.28Cd0.72S and TiO2 Photocatalysts in the Degradation of Methyl Orange

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• 作者：Wenjuan Li ; Danzhen Li ; Jiangjun Xian ; Wei Chen ; Yin Hu ; Yu Shao ; Xianzhi Fu
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：December 16, 2010
• 年：2010
• 卷：114
• 期：49
• 页码：21482-21492
• 全文大小：660K
• 年卷期：v.114,no.49(December 16, 2010)
• ISSN：1932-7455

文摘

As different light-driven photocatalysts, Zn_0.28Cd_0.72S and TiO₂ showed different properties in the photocatalytic process. In this paper, the comparison was carried out among the properties of Zn_0.28Cd_0.72S-visible, Zn_0.28Cd_0.72S-UV, and TiO₂-UV light systems in the degradation of methyl orange. After the addition of different types of active species quenchers and the results detected by electron spin resonance, a photoluminescence technique, and a photometric method, it was found that, in the Zn_0.28Cd_0.72S-UV system, O₂, •OH, and holes played a bigger role, whereas in the TiO₂-UV system, •OH and holes predominated; in the Zn_0.28Cd_0.72S-visible light system, O₂ and holes contributed to the degradation. The differences between the two catalysts lead us to realize the active species and the degradation mechanism in photocatalytic process.