Preparation of Rare Earth Yb Doped TiO_2 Photo-catalyst by Microwave Hydrothermal Method and Its Photo-catalytic Activity

摘要

The rare earth Yb doped TiO_2 photo-catalysts TiO_2-Yb were prepared by microwave hydrothermal method and its photo-catalytic activity under UV irradiation and solar irradiation were investigated. The optimal conditions for the preparation of TiO_2-Yb photo-catalyst were obtained by optimizing the reaction condition. They were that Yb and Ti molar ratio n (Yb~(3+))/n (Ti~(4+)) =0.14%, microwave power 600 W, reaction temperature 160°C, reaction time 3.5 h in parallel synthesis reaction and calcination temperature 650°C, calcination time 2.5 h in the high temperature box resistance furnace. The degradation rate of methyl orange was 98.71% when the TiO_2-Yb was used for degradation of methyl orange in the UV irradiation for 50 min. But the degradation rate of methyl orange could almost reach 100% in the sunlight degradation of methyl orange for 4 h, which indicated that the TiO_2-Yb prepared by microwave hydrothermal method had higher photo-catalytic activity.