二氧化钛的制备及光催化性能研究

以钛酸四正丁酯为钛源,采用水热法和溶胶凝胶法制备纳米二氧化钛(Ti O2),通过X-射线衍射(XRD)以及紫外-可见(UV-Vis)光谱进行表征,研究反应温度、反应时间、煅烧温度、煅烧时间及溶液配比对二氧化钛结构及光催化性能的影响。结果表明,水热法制备的Ti O2结晶程度随反应温度、反应时间、煅烧温度的增加而增加,对模拟污染物罗丹明B的降解能力随反应温度、煅烧温度的增加先升高再降低,在反应温度160℃,煅烧温度500℃,反应时间为4h时降解率最高,达83.73%。溶胶凝胶法制备的Ti O2结晶度随水的比例、煅烧温度、煅烧时间的增加而增加,对罗丹明B的光催化降解能力随着水的比例、煅烧温度的增加先增加再降低,水的比例为1∶2.5,煅烧温度为500℃,煅烧时间为6h时光催化降解率最高,为86.82%,而煅烧时间对其催化率影响不明显。

Synthesis of Titanium Dioxide and the Study of Photocatalytic Activity

By hydrothermal and sol-gel method,TiO2 particles have been prepared and the tetrabutyltitanate as the titanium source. The samples were characterized by x-ray diffraction (XRD) and UV-Visible (UV-Vis) spectroscopy to study the effect of different reaction conditions to photocatalytic properties, including reaction temperature, reaction time, calcination temperature, calcination time and the solution ratio. The results show that the reaction temperature, reaction time, calcination temperature are conducive to improve the crystalline of titanium dioxide. The rhodamine B was used as simulating pollutants and the highest degradation is 83. 73%when the TiO2 were synthesized at 150℃ for 4h and then calcined at 500℃. similar to hydrothermal method,the reaction temperature,reaction time,calcination temperature, calcination time and the solution ratio have the same effect on the crystalline of titanium dioxide in the sol-gel way and the degradation of rhodamine B would reach to 86. 82%.