Influence of Structural and Surface Characteristics of Ti1-xZrxO2 Nanoparticles on the Photocatalytic Degrada

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• 作者：Mar&iacute ; a D. Herná ; ndez-Alonso ; Juan M. Coronado ; Belé ; n Bachiller-Baeza ; Marcos Ferná ; ndez-Garc&iacute ; a ; Javier Soria
• 刊名：Chemistry of Materials
• 出版年：2007
• 出版时间：August 21, 2007
• 年：2007
• 卷：19
• 期：17
• 页码：4283 - 4291
• 全文大小：173K
• 年卷期：v.19,no.17(August 21, 2007)
• ISSN：1520-5002

文摘

In the present work, we investigate the influence of the physicochemical characteristics of Ti_1-xZr_xO₂nanoparticles with anatase structure on the photocatalytic activity for the elimination of methylcyclohexanein the gas phase. Samples with a molar content of Zr ranging from 0 to 16% were prepared by an inversemicroemulsion method. Additionally, a sample of ZrO₂ supported on TiO₂ (5.2% molar content of Zr)was obtained in a two-stage synthesis using the same microemulsion procedure. The structural andelectronic properties of these materials were determined by a multitechnique approach using X-raydiffraction as well as Raman, XANES, EXAFS, and UV-vis spectroscopies. FTIR spectra of the catalystsbefore and after photocatalytic experiments were also carried out in order to evaluate the possible changeson the surface upon photoreaction. In addition, surface characteristics of these nanoparticles weredetermined by means of N₂ adsorption isotherms and NH₃ adsorption microcalorimetry. XRD and XASresults indicate that the anatase-type structure is maintained throughout the Ti-Zr series, althoughnoticeable changes in the local order are detected for samples above/below 6 % zirconium. All Ti_1-xZr_xO₂samples show a significant enhancement of the photocatalytic activity with respect to both TiO₂ and theZrO₂/TiO₂ sample at high relative humidity. In contrast, Ti-Zr catalysts exhibit higher deactivation underdry conditions than pure titania. These observations are discussed in relation to the structural and electronicmodifications of the anatase nanoparticles induced by Zr incorporation.