Role in photocatalysis and coordination structure of metal ions adsorbed on titanium dioxide particles: a comparison between lanthanide and iron ions

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• 作者：Matsuo ; Shuji ; Sakaguchi ; Nahomi ; Yamada ; Keiji ; Matsuo ; Taku ; Wakita ; Hisanobu
• 关键词：61.10.Ht ; 68.43.-h ; 68.47.Fg ; 82.45.Jn ; Lanthanide ; Iron ; Titanium dioxide ; Photocatalysis ; EXAFS
• 刊名：Applied Surface Science
• 出版年：2004
• 出版时间：April 30, 2004
• 年：2004
• 卷：228
• 期：1-4
• 页码：233-244
• 全文大小：338 K

文摘

The effect of simply adsorbed Sm, Eu, and Yb ions on TiO₂ (Ln/TiO₂) and Fe ions adsorbed onto TiO₂ (Fe/TiO₂) was examined from the photocatalytic decomposition of adenosine 5′-triphosphate (ATP) as an anionic substance, 2-propanol as a neutral substance, and methylene blue (MB) as a cationic substance. The amount of ATP disappearing in 40min of reaction in the presence of Ln/TiO₂ increases in the order Ln=Sm<Eu<Yb. For 2-propanol, the photocatalytic activities of Ln/TiO₂ catalysts were similar to that of unmodified TiO₂ (u-TiO₂) catalyst. For MB, the photocatalytic activities of Ln/TiO₂ catalysts were less than that of u-TiO₂ catalyst. By contrast, Fe/TiO₂ catalyst was excellent in photocatalytic decomposition of ATP, 2-propanol, and MB. The photocatalytic activity of Yb/TiO₂-C calcined at 500°C for 1h was reduced for ATP, a reduced slightly for 2-propanol, and increased for MB compared with Yb/TiO₂. Photocatalytic activities of Fe/TiO₂-C for ATP, 2-propanol, and MB were all less than for Fe/TiO₂. The local structure around the lanthanide ions on TiO₂ particles was revealed by EXAFS measurement. The structure of the Yb atom in Yb/TiO₂-C was composed of the YbO bonds as in Yb₂O₃, rather than YbCl bonds in Yb/TiO₂.