超声辅助合成N掺杂纳米TiO2介孔材料及其光催化性能

为提高纳米TiO2光催化性能,通过高能超声辅助溶胶-凝胶法合成了N掺杂纳米TiO2光催化剂。结果表明：高能超声的空化作用细化了纳米TiO2的显微结构,形成了分散有序的介孔结构,同时也提高N的掺杂浓度,改善了电子的轨道能级,减小光催化剂的禁带宽度。当超声频率为45 KHz时,纳米TiO2的晶粒尺寸约为12 nm,介孔孔道尺寸为10 nm,对太阳光的吸收波长达到540 nm,对有机污染物的有效降解率为94%。可见高能超声显著提高了对太阳光的吸收效率,改善纳米TiO2的光催化性能。

Synthesis of N doped nano TiO2 mesoporous material via ultrasound-assisted and its photocatalytic properties

In order to improve the photocatalytic properties of nano TiO2, N doped nano TiO2 photocatalyst was synthesized by high-energy ultrasonic assisted sol-gel method. The results show that the cavitation of high-energy ultrasound refines the microstructure of nano TiO2 and forms a dispersed ordered mesoporous structure. At the same time, the doping concentration of N is increased, the orbital energy level of electron is improved, and the band gap of photocatalyst is reduced. When the ultrasonic frequency is 45 KHz, the grain size of nano TiO2 is about 12 nm, the mesoporous channel size is 10 nm, the absorption wavelength of sunlight reaches 540 nm, and the effective degradation rate of organic pollutants is 94%. It is concluded that high energy ultrasound significantly improves the absorption efficiency of sunlight and improves the photocatalytic performance of nano TiO2.