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采用溶胶-凝胶的方法制备得到了Y、Ho、Sm和Ce掺杂的TiO2薄膜,XRD分析表明薄膜结晶性能良好,具有锐钛矿晶型。同时研究了稀土元素掺杂浓度和光照条件对薄膜性能的影响,得到了Y、Ho、Sm和Ce的最佳掺杂浓度。研究表明,稀土掺杂同未掺杂相比能提高TiO2薄膜的光催化活性,其中在最佳掺杂浓度时的光催化降解率最高,薄膜的降解率达到了90%。以Sm掺杂的TiO2薄膜降解乐果,结果表明,在太阳光照条件下比在紫外光照条件下具有更高的降解率。
Y, Ho, Sm and Ce doped TiO2 thin films were prepared by sol-gel method. The XRD results showed that the thin films exhibited good crystallinity and anatase crystal form. At the same time, the effects of rare earth doping concentration and light conditions on the properties of thin films were studied, and the optimum doping concentrations of Y, Ho, Sm and Ce were obtained. The results show that the doping of rare earth can improve the photocatalytic activity of TiO2 thin films compared with undoped ones. The photocatalytic degradation rate is the highest at the optimal doping concentration, and the degradation rate of the films reaches 90%. Degradation of dimethoate with Sm-doped TiO2 films showed that the degradation rate was higher in sunlight than in UV.