Rapid Synthesis of Nanocrystalline TiO2/SnO2 Binary Oxides and Their Photoinduced Decomposition of Methyl Orange

✍ Scribed by Juan Yang; Dan Li; Xin Wang; XuJie Yang; LuDe Lu

• Publisher: Elsevier Science
• Year: 2002
• Tongue: English
• Weight: 298 KB
• Volume: 165
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.2001.9526

✦ Synopsis

A rapid and simple method, the so-called stearic acid method (SAM) was developed to prepare nanostructured TiO 2 /SnO 2 binary oxides by combustion of stearic acid precursors. The preparative process was studied by Fourier transform infrared spectroscopy (FT-IR). During the preparative process, metal precursors were dispersed in stearic acid at molecular level. Microstructure of the samples was investigated by X-ray di4raction (XRD), transmission electron microscopy (TEM), BET speci5c surface area measurement and the results were compared with those obtained by conventional sol8gel method. The photocatalytic decomposition of methyl orange was used as a model system to determine the relative in6uences of the preparation method and the concentration of SnO 2 on the photocatalytic activities. It was found that preparative methods a4ected the crystalline structure of TiO 2 /SnO 2 powders and the anatase phase of TiO 2 was stabilized by the addition of SnO 2 in SAM. The samples prepared by SAM showed better dispersity, larger speci5c surface area and the TiO 2 /SnO 2 (r‫,51.0؍‬ SAM) catalyst showed higher photocatalytic activity than Degussa P25.