S, Sr-codoped TiO2 were prepared by sol-gel mothod, using titanium (IV) n-butoxide, strontium nitrate and thiourea as precursors. And the samples were characterized by X-ray diffraction (XRD), Fourier infrared spectroscopy (FTIR), scanning electron microscopy (SEM). The results showed that the S, Sr-codoped TiO2 were single-phase anatase structure, and the particle growth and crystal phase transformation can be restrained by doping. The photocatalytic activity and reusability of the catalysts under UV light (365nm) was investigated with methyl orange as the model compound. The results showed that S, Sr-codoped TiO2 had the highest photocatalytic activity among all as-prepared samples. The kinetic study showed that this photocatalytic process coincided with the Langmuir-Hinshelwood (L-H) pseudo first order reaction model.
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