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采用微乳法制备了纯TiO2纳米粉体、Fe掺杂TiO2(Fe-TiO2)、Ce掺杂TiO2(Ce-TiO2)和Ce、Fe共掺杂TiO2(Fe/Ce-TiO2)纳米复合体。通过X射线衍射、扫描电镜和紫外漫反射光谱等对样品的结构和形态进行表征。以甲基橙溶液为标准模拟降解物,对Fe/Ce-TiO2、Fe-TiO2、Ce-TiO2和纯TiO2光催化降解性能进行评价。结果表明:Fe、Ce掺杂后TiO2的光催化性能明显提高,原因是Fe、Ce掺杂不仅能抑制TiO2晶粒生长,提高TiO2的热稳定性和比表面积,而且能够拓展TiO2的吸收波长范围至可见光区,降低了光生载流子的复合几率。共掺杂对TiO2光催性能的提高具有双重效应,使Fe/Ce-TiO2光催化活性明显高于Fe-TiO2的和Ce-TiO2的。500℃制备的Fe/Ce-TiO2对甲基橙降解效果最佳,归功于热处理温度对晶型和晶粒尺寸的影响。
Pure TiO2 nanoparticles, Fe-TiO2, Ce-TiO2 and Ce, Fe-doped TiO2 (Fe / Ce-TiO2) nanocomposites were prepared by microemulsion method. The structure and morphology of the samples were characterized by X-ray diffraction, scanning electron microscopy and ultraviolet diffuse reflectance spectroscopy. The photocatalytic degradation of Fe / Ce-TiO2, Fe-TiO2, Ce-TiO2 and pure TiO2 was evaluated by using methyl orange solution as a standard simulation degradation product. The results show that the photocatalytic activity of TiO2 is obviously improved after Fe and Ce doping. The reason is that the doping of Fe and Ce can not only inhibit the growth of TiO2 crystal, but also increase the thermal stability and specific surface area of TiO2. To the visible region, reducing the recombination rate of photo-generated carriers. The co-doping has a dual effect on the photocatalytic activity of TiO2, which makes the photocatalytic activity of Fe / Ce-TiO2 significantly higher than that of Fe-TiO2 and Ce-TiO2. The best degradation effect of methyl orange on Fe / Ce-TiO2 prepared at 500 ℃ is attributed to the effect of heat treatment temperature on the crystal form and grain size.