纳米钛酸锶的结构、光学性质及其光催化还原CO2性能

摘要

采用水和乙二醇作为热溶剂合成了纳米钛酸锶,以X射线衍射(XRD),扫描电镜(SEM),氮气吸附(BET)等对其结构表征,表明采用乙二醇作为热溶剂得到的块状钛酸锶具有多孔结构,比表面积可达191 m2/g.通过紫外可见漫反射吸收(UV-vis)、荧光光谱(PL)、光电流等方法对样品的光学性质进行测试,程序升温化学吸附仪(TPD)对样品的CO2化学吸附进行测定,在氙灯照射下钛酸锶对CO2进行光催化还原.结果表明,以乙二醇作为热溶剂得到的钛酸锶其光催化还原CO2的效率是以水作为热溶剂得到的钛酸锶的2倍.%Nanoscale strontium titanate was synthesized by hydrothermal methods that using water and eth -ylene glycol as the thermal solvent respectively.The structure of the samples were characterized by X-ray diffraction(XRD),scanning electron microscopy(SEM)and nitrogen adsorption(BET),which indicating that the bulk strontium titanate obtained by using ethylene glycol as the thermal solvent has a porous structure and the surface area reaches to 191 m2/g.The UV-Vis diffusive reflectance spectrophotometer (UV-Vis),photoluminescence spectroscopy(PL)and photocurrent were used to characterize the optical properties of the samples.The adsorption of carbon dioxide was determined by a temperature programmed desorption(TPD).The photocatalytic activity of the strontium titanate was evaluated by photo reduction carbon dioxide with a xenon lamp as simulated solar radiation.The results show that the rate of photore-duction of carbon dioxide over strontium titanate obtained by using ethylene glycol as the thermal solvent is two times of strontium titanate obtained by using water as the thermal solvent.