TiO_(2)-SiO_(2)复合材料的制备及其光催化性能研究

Preparation and photocatalytic performance of TiO_(2)-SiO_(2)composites

采用溶胶凝胶法制备了一种新型的TiO_(2)-SiO_(2)复合材料,并考察了其光催化降解染料废水中罗丹明B(RhB)的效率。通过X射线衍射(XRD),透射电子显微镜(TEM),扫描电子显微镜(SEM),X射线光电子能谱(XPS),光致发光光谱(PL)等仪器对制备的样品进行表征。结果表明,TiO_(2)与SiO_(2)的结合抑制了锐钛矿向金红石的转变,从而减小了电子-空穴的复合几率。研究发现,当SiO_(2)含量为40%,煅烧温度为800℃时,TiO_(2)-SiO_(2)复合材料具有最高的光催化活性。此外,复合材料具有良好的催化稳定性,在光催化降解RhB过程中·O^(2-)是主要的活性物种。

In this paper,a new TiO_(2)-SiO_(2)composite was prepared by sol-gel and the efficiency of rhodamine B(RhB)in photocatalytic dye wastewater was investigated.The samples were characterized by X-ray diffraction(XRD),transmission electron microscope(TEM),scanning electron microscope(SEM),X-ray photoelectron spectroscopy(XPS),photoluminescence spectroscopy(PL)and other instruments.The results show that the binding of TiO_(2)to SiO_(2)inhibits the anatase to rutile transition,thus reducing the chance of an electron-hole recombination.We found that the TiO_(2)-SiO_(2)composites had the highest photocatalytic activity when the SiO_(2)content was 40%and the calcination temperature was 800℃.Moreover,the composites have good catalytic stability,and·O 2-is the main active species during the photocatalytic degradation of RhB.