Preparation of （Ti, Sn）O₂ Nano-Composite Photocatalyst by Supercritical Fluid Dry Combination Technology

Jingchang ZHANG, Qing LI and Weiliang CAO Institute of Modern Catalysis, The Key Laboratory of Science and Technology of Controllable Chemical Reactions, Ministry of Education, Beijing University of Chemical Technology, Beijing 100029, China

摘 要：<正>A series of TiO2-SnO2 nano-sized composite photo-catalysts containing Sn （9.3%-30.1%） were prepared from TiCI4 and SnCl4·5H2O by using sol-gel, supercritical fluid dry and solid-phase reaction （SCFD） combination technology. Characterizations with X-ray diffraction （XRD）, transmission electron microscopy （TEM） and Fourier Transform Infrared Spectroscopy （FTIR） showed that, in addition to anatase type TiO2, a new active phase （Ti, Sn）O2 （with particle size of 2.0-4.3 nm） formed, and there were no SnO2 crystals observed in the range of the doping concentration studied. Photo-catalytic reaction of phenol was used as a model reaction to evaluate the catalytic activities of the obtained catalysts. Compared with pure TiO2 or Ti-Sn catalyst prepared with general sol-gel method, Ti-Sn nano-composite photo-catalyst thus obtained showed significant improvement in catalytic activity. The photo-catalytic degradation rate of phenol could reach as high as 93.5% after 7 h. The preparation conditions of the new phase (T

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