A Bicomponent TiO2/SnO2 Particulate Film for Photocatalysis

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• 作者：Yaan Cao ; Xintong Zhang ; Wensheng Yang ; Hui Du ; Yubai Bai ; Tiejin Li ; and Jiannian Yao
• 刊名：Chemistry of Materials
• 出版年：2000
• 出版时间：November 2000
• 年：2000
• 卷：12
• 期：11
• 页码：3445 - 3448
• 全文大小：167K
• 年卷期：v.12,no.11(November 2000)
• ISSN：1520-5002

文摘

Plasma-enhanced chemical vapor deposition (PECVD) was used in the preparation of aseries of bicomponent TiO₂/SnO₂ particulate films. The photocatalytic activities of the filmsare evaluated by photodegradation of phenol in solution. When both the TiO₂ and SnO₂components of the bicomponent TiO₂/SnO₂ catalysts are accessible to reactants at the catalystsurface, photocatalytic degradation efficiencies are improved as compared to those obtainedwith TiO₂ films. When this condition prevails, the two components are believed to act in acooperative manner by increasing the degree of charge carrier separation sufficient to reducerecombination, while simultaneously allowing sufficient time for photoelectrons and photoholes on the catalyst surface to form reaction intermediates (for example, the superoxideradical ion, O₂^·-, formed by reaction of O₂ with photoelectrons, and the phenol radical, formedby reaction of phenol with photoholes or OH^· radicals) which cooperatively participate inlater stages of the degradation process.