Surface and Bulk Composition, Structure, and Photocatalytic Activity of Phosphate-Modified TiO2

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• 作者：Lá ; szló ; Kö ; rö ; si ; Szilvia Papp ; Imre Bertó ; ti ; Imre D&eacute ; ká ; ny
• 刊名：Chemistry of Materials
• 出版年：2007
• 出版时间：September 18, 2007
• 年：2007
• 卷：19
• 期：19
• 页码：4811 - 4819
• 全文大小：462K
• 年卷期：v.19,no.19(September 18, 2007)
• ISSN：1520-5002

文摘

Phoshpate-modified titania (P-TiO₂) samples of varying phosphate contents were prepared by thesol-gel method, and the photocatalytic activity was tested in the gas-phase degradation of ethanol atroom temperature. DRIFT, UV-vis-DR, N₂ adsorption, and XRD methods were used to characterizethe structural properties of the P-TiO₂ samples. XPS, ICP-AES, and SAXS investigations were additionallyperformed to further clarify the structural changes of the TiO₂ sample due to phosphate modification.We showed that the phosphate ions reacted with the TiO₂ surface and that a new crystalline titaniumphosphate phase appeared during the calcination process. It was found that the structural and opticalproperties of the titania samples are strongly influenced by their phosphate content. The photocatalyticactivity of the P-TiO₂ was compared with that of Degussa P25 titanium dioxide by ethanol photooxidationin the gas phase. We have shown that total degradation of ethanol is significantly faster on P-TiO₂samples with optimal phosphate content than it is on Degussa TiO₂. Phosphate groups bound to thesurface of titania are responsible for the enhanced photo-oxidation observed on P-TiO₂ samples.