Three TiO 2 loaded composites, TiO 2 /kaolin, TiO 2 /diatomite, and TiO 2 /zeolite, were prepared in order to improve the solar light photocatalytic activity of TiO 2 . The results showed that the photocatalytic activity could obviously be enhanced by loading appropriate amount of inorganic mineral materials. Mean while, TiO 2 content, heat treatment temperature and heat treatment time on the photocatalytic activity were reviewed. Otherwise, the effect of solar light irradiation time and dye concentration on the photocatalytic degradation of Acid Red B was investigated. Furthermore, the degradation mechanism and adsorption pro cess were also discussed.

The Er 3+ :Y 3 Al 5 O 12 , as an upconversion luminescence agent which is able to transform the visible part of the solar light to ultraviolet light, was prepared by nitrate citrate sol gel method. A novel solar light photocatalyst, Er 3+ :Y 3 Al 5 O 12 /TiO 2 -CeO 2 composite was synthesized using ultrasonic treatment. The X ray diffraction (XRD) and scanning election microscopy (SEM) were used to characterize the structural mor phology of the Er 3+ :Y 3 Al 5 O 12 /TiO 2 -CeO 2 composite. In order to evaluate the solar light photocatalytic activity of Er 3+ :Y 3 Al 5 O 12 /TiO 2 -CeO 2 composite, the Azo Fuchsine dye was used as a model organic pollut ant. The progress of the degradation reaction was monitored by UV-Vis spectroscopy and ion chromatogra phy. The key influences on the solar light photocatalytic activity of Er 3+ :Y 3 Al 5 O 12 /TiO 2 -CeO 2 were studied, such as Ti/Ce molar ratio, heat treatment temperature and heat treatment time. Otherwise, the effects of ini tial dye concentration, Er 3+ :Y 3 Al 5 O 12 /TiO 2 -CeO 2 amount, solar light irradiation time and the nature of the dye on the solar light photocatalytic degradation process were investigated. It was found that the solar light photocatalytic activity of Er 3+ :Y 3 Al 5 O 12 /TiO 2 -CeO 2 composite was superior to Er 3+ powder in the similar conditions.

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