Controllable Synthesis and Photocatalytic Activity of Anatase TiO2 Single Crys-tals with Exposed {110} Facets

doi:10.1016/S1872-2067(11)60448-8

Abstract

Abstract: Anatase TiO₂ single crystals with a high percentage of the high surface energy {110} facets have been successfully synthesized in a simple and economical way using a modified hydrothermal technique in the presence of hydrogen peroxide and hydrofluoric acid. The morphology and structure of the TiO₂ single crystals were characterized by X-ray diffraction, scanning electron microscopy, and Raman spectroscopy. The photocatalytic activity of the TiO₂ crystals for the degradation of methylene blue dye was investigated by ultraviolet light irradiation. The effects of the amounts of HF and H₂O₂ on the morphology of TiO₂ have been studied. The reaction time and temperature have also been investigated. In the TiO₂ single crystals, the {001} and {110} facets are present at the same time. The results indicated that a high yield of single crystals with exposed {110} and {110} facets could be obtained by adjusting the reaction time, reaction temperature, and amounts of HF and H₂O₂. The anatase TiO₂ single crystals with exposed {110} facets showed higher photocatalytic activities than those without.

Key words: titania, facet with high surface energy, {110} facets, hydrothermal technique, photocatalysis

WU Qian, WU Zhi-Jiao, LI Yong-Liang, GAO Hong-Tao, PU Ling-Yu, ZHANG Tian-Hui, DU Li-Xia. Controllable Synthesis and Photocatalytic Activity of Anatase TiO₂ Single Crys-tals with Exposed {110} Facets[J]. Chinese Journal of Catalysis, 2012, 33(11): 1743-1753.

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Controllable Synthesis and Photocatalytic Activity of Anatase TiO₂ Single Crys-tals with Exposed {110} Facets

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