Study on Photocatalytic Performance of Rare-Earth Doped TiO2
A series of TiO2 photocatalysts were prepared by sol-gel method with butyl titanate,anhydrous ethanol and glacial acetic acid as raw materials and Rhodamine B as simulated organic pollutants.The catalysts were characterized by XRD and nitrogen adsorption-desorption.The effects of raw material ratio,gel time,rare earth doping type and rare earth doping amount on the photocatalytic performance of Rhodamine B by TiO2 were investigated.The experimental results showed that TiO2 photocatalytic degradation of Rhodamine B was the best when the ratio of butyl titanate to glacial acetic acid was 1.5∶1,the ratio of butyl titanate to anhydrous ethanol was 2∶1,gelling time was 48 h,Pr doping amount was 2%.When the initial mass concentration of Rhodamine B was 4 mg·L-1,the catalyst weight was 0.05 g and the photoreaction time was 6 h,the degradation rate of Rhodamine B reached 93.23%.
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