Relation between phase composition and photocatalytic activity of TiO 2 in a sulfoxide deoxygenation reaction
| Autor: | Alessandra Molinari, Giuliana Magnacca, Francesca Bonino, Andrea Maldotti, Francesca Demaria |
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| Rok vydání: | 2015 |
| Předmět: |
Anatase
Materials science Sulfide Raman spectroscopy and scattering Semiconductors X-ray diffraction topography Raman spectroscopy and scattering Irradiation effects Inorganic chemistry Photochemistry law.invention chemistry.chemical_compound law Irradiation effects Semiconductors X-ray diffraction topography Materials Science (all) Condensed Matter Physics General Materials Science Calcination Deoxygenation chemistry.chemical_classification Ambientale Sulfoxide chemistry Rutile Photocatalysis Selectivity |
| Zdroj: | Materials Chemistry and Physics. 158:60-66 |
| ISSN: | 0254-0584 |
| DOI: | 10.1016/j.matchemphys.2015.03.035 |
| Popis: | In the present study we synthesize three TiO2 samples, TiO2-500, TiO2-750 and TiO2-850, by a sol–gel procedure varying the rutile and anatase content by calcination at different temperatures. Characterization by XRD, NIR-Raman, UV-Raman, BET, DR-UV-Vis spectroscopy and SEM points out that TiO2-500 consists mainly of anatase and TiO2-850 of rutile. TiO2-700 presents both phases on the surface that is the part of the photocatalyst interested by UV illumination. The photocatalysts are tested in the deoxygenation reaction of methyl p-tolyl sulfoxide to the corresponding sulfide using 2-propanol as hole scavenger. It is demonstrated that the presence of both anatase and rutile on the surface of TiO2-700 is responsible of the increase of the photocatalytic activity. This is likely due to a more efficient charge separation process that increases lifetime of the charges giving availability of electrons and holes for the photocatalytic reaction. Methyl p-tolyl sulfide is formed with a selectivity of 100%. |
| Databáze: | OpenAIRE |
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