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采用超声波辐射法制备了具有介孔结构的高浓度氮掺杂TiO2纳米晶(N/TiO2).采用N2物理吸附、X射线粉末衍射、X射线光电子能谱、透射电镜、光致发光谱和紫外-可见漫反射光谱等手段对N/TiO2进行了表征.以波长为400~660nm的可见光为光源,以水体污染物邻苯二甲酸二甲酯为降解对象,考察了不同制备方法对N/TiO2光催化性能的影响.结果表明,超声波辐射使氮掺杂浓度提高了2.2倍,该法制备的N/TiO2同时具有较好的介孔结构,表现了更高的光催化降解邻苯二甲酸二甲酯的活性.其活性提高的主要原因是N/TiO2含有更高浓度的氮和对可见光具有更强的吸收能力.
High concentration nitrogen-doped TiO2 nanocrystals (N / TiO2) with mesoporous structure were prepared by ultrasonic irradiation.The structures of the nanostructured TiO2 nanocrystals were characterized by N2 physisorption, X-ray powder diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, - visible diffuse reflectance spectroscopy were used to characterize the N / TiO2.The visible light with the wavelength of 400-660nm was used as light source, and the pollutant dimethyl phthalate was taken as the degradation target. The effects of different preparation methods on the photocatalytic activity of N / TiO2 The results showed that the ultrasonic irradiation increased the nitrogen doping concentration by 2.2 times. The prepared N / TiO2 has better mesoporous structure and higher photocatalytic degradation of di Methyl ester.The main reason for the increase in activity is that N / TiO2 contains higher concentrations of nitrogen and has a stronger absorption of visible light.