Abstract
Phase transformation of TiO2 from anatase to rutile was studied by UV Raman spectroscopy with the excitation lines at 325 and 244 nm, visible Raman spectroscopy with the excitation line at 532 nm, X-ray diffraction (XRD) and transmission electron microscopy (TEM). It is found that UV Raman spectroscopy is more sensitive to the surface region of TiO2 than visible Raman spectroscopy and XRD because TiO2 strongly absorbs UV light. The anatase phase can be detected by UV Raman spectroscopy for the sample calcined at higher temperatures compared with that detected by visible Raman spectroscopy and XRD. It is suggested that the rutile phase nucleates at the interfaces of the contacting anatase particles; namely, for the agglomerated TiO2 particles, the anatase phase in the inner region is easier to change into the rutile phase than that in the outer surface region. When the anatase particles are covered with highly dispersed La2O3, the anatase phase can be stabilized both in the bulk and at the surface region even calcination at 900°C, owing to avoiding the direct contact of the anatase particles and occupying the surface defect sites of the anatase particles by La2O3. Additionally, the La2O3 impregnation could effectively inhibit the growth of TiO2 particles. The photocatalytic performance of TiO2 samples with different surface phase structures was investigated. The surface-phase junction formed between the anatase nanoparticles and rutile particles can greatly enhance the photocatalytic activity for H2 production.
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Acknowledgements
This work was financially supported by the National Natural Science Foundation of China (NSFC, Grant No. 20673112), National Basic Research Program of China (Grant No. 2009CB220010), and Program for Strategic Scientific Alliances between China and the Netherlands (2008DFB50130).
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Zhang, J., Xu, Q., Feng, Z., Li, C. (2010). UV Raman Spectroscopic Studies on Titania: Phase Transformation and Significance of Surface Phase in Photocatalysis. In: Anpo, M., Kamat, P. (eds) Environmentally Benign Photocatalysts. Nanostructure Science and Technology. Springer, New York, NY. https://doi.org/10.1007/978-0-387-48444-0_6
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