溶剂热法制备纳米二氧化钛及光催化活性研究

Preparation and Photocatalytic properties of TiO2 by solvothermal synthesis

摘要:

以钛酸四丁酯为钛源，氨水为溶剂，氢氟酸为氟源，利用溶剂热法制备二氧化钛粉体。利用X射线衍射( XRD )、扫描电镜( SEM )、氮气吸附脱附( BET )、傅里叶变换红外光谱( FT-IR )等技术对其进行了系统的表征，以亚甲基蓝( MB )溶液为染料，考察了氟离子修饰的TiO2对光催化性能的影响。结果表明：用氨水为溶剂，氢氟酸为氟源制得的样品TiO2均为锐钛矿相,氟离子以化学吸附态存在于TiO2表面，并且氟的修饰增加了其晶化度，抑制了晶粒的生长，增大了晶粒的比表面积，促进了羟基自由基( ?OH )的形成，从而提高了二氧化钛粉体的光催化活性。

Abstract:

F-doped TiO2 have been prepared using tetrabutyl titanate，ammonia and hydrofluoric acid by solvoethermal method.The properties of the powders were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM)，N2 adsorption-desorption isotherms (BET) and Fourier transform infrared (FT-IR). The photodegradation of methylene blue (MB) solution was used to evaluate the photocatalytic activity of the catalyst under UV and visible light irradiation. The results showed that the TiO2 was in the pure anatase phase, the fluorine atoms were mainly distributed on the surface of TiO2, the photocatalytic activity was increased by adding hydrofluoric acid, it can increased the surface area， improved the crystallinity of the anatase phase and enhanced the formation of free OH radicals.