Abstract
The TiO2–SnO2 nanocomposite with excellent photocatalytic activity was synthesized via sol–hydrothermal process. The obtained samples were characterized by XRD, FETEM, LRS and UV–vis DRS. The photocatalytic activities of as-prepared samples were investigated by degradation of methyl blue (MB) under UV illumination. The results clearly indicate that a small quantity of SnO2 adding can accelerate the anatase-to-rutile transformation greatly, and the nanocomposites consisting of anatase (A) and rutile (R) phases are formed in the molar ratios Ti:Sn=20:1, 60:1 and 80:1, respectively. They show the higher photocatalytic activity than that of TiO2 (A). Remarkably, they can be enhanced up to several times compared with TiO2-P25. Especially, the catalyst of molar ratio Ti:Sn=60:1 is found to be the most efficient, it exhibits a complete decomposition of MB within 20min under UV irradiation. The results are explained by taking into account the intergrowth and coexistence effects of optimized anatase–rutile phases TiO2–SnO2 catalyst, the larger specific surface area and Quantum-sized TiO2–SnO2 particles obtained from the sol–hydrothermal method.
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