Influence of metal ions on the photocatalytic activity: Selective oxidation of benzyl alcohol on iron (III) ion-modified TiO2 using visible light
| Autor: | Yoshihisa Sakata, Yuta Osano, Hiroyoshi Ohue, Hisayoshi Kobayashi, Ryo Shirai, Masashi Azuma, Shinya Higashimoto |
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| Rok vydání: | 2014 |
| Předmět: |
Chemistry
Metal ions in aqueous solution Inorganic chemistry chemistry.chemical_element Photochemistry Catalysis Metal Cerium chemistry.chemical_compound Benzyl alcohol visual_art Alcohol oxidation Titanium dioxide visual_art.visual_art_medium Photocatalysis Physical and Theoretical Chemistry Platinum |
| Zdroj: | Journal of Catalysis. 311:137-143 |
| ISSN: | 0021-9517 |
| Popis: | Photocatalytic activity of the surface-modified TiO 2 loaded with several metal ions such as iron, silver, cerium, platinum, or copper for the oxidation of benzyl alcohol were investigated under visible-light irradiation. Among the metal ion-modified TiO 2 , the iron (III) ion-modified TiO 2 was found to exhibit the highest photocatalytic performance with the selectivity (>99%) to benzaldehyde. From the analysis of absorption spectra, apparent quantum yields and DFT calculations, the contribution of the Fe 3+ ions on the TiO 2 to the photocatalytic reaction was demonstrated. It was confirmed that a remarkable enhancement of the photocatalytic activity is attributed to a synergetic effect, i.e., the efficient electronic transitions from the energy levels constructed by the O 2p orbitals of the alcoholate species hybridized with the occupied Fe 3d orbitals to the conduction band of the TiO 2 , as well as subsequent electron transfers to the unoccupied Fe 3d orbitals as the acceptor levels followed by O 2 reduction. |
| Databáze: | OpenAIRE |
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