Li Zhijie, Hou Bo, Xu Yao, Wu Dong, Sun Yuhan
State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, China.
J Colloid Interface Sci. 2005 Aug 1;288(1):149-54. doi: 10.1016/j.jcis.2005.02.082.
Silica-modified titanium dioxides were prepared by a hydrothermal method and then characterized by XRD, FT-IR, XPS, TEM, and UV-visible spectroscopy. The silica-modified titanium dioxides were in anatase phase and had large surface areas. There was strong interaction between SiO2 and TiO2, and TiOSi bonds formed during the hydrothermal process. The addition of silica in TiO2 particles could effectively suppress the formation of the rutile phase and the growth of titanium dioxide crystals. DRS spectra proved an increase in the band-gap transition with the increase of silica. The silica-modified TiO2 nanoparticles exhibited better photocatalytic activity, which increased with the silica amount, in comparison with pure TiO2 nanoparticles. Due to better thermal stability, the photocatalytic activity of the silica-modified TiO2 sample held good photocatalytic activity even after calcined at 1273 K.
采用水热法制备了二氧化硅改性的二氧化钛，然后通过X射线衍射（XRD）、傅里叶变换红外光谱（FT-IR）、X射线光电子能谱（XPS）、透射电子显微镜（TEM）和紫外可见光谱对其进行了表征。二氧化硅改性的二氧化钛为锐钛矿相，具有较大的表面积。SiO₂ 与TiO₂ 之间存在强相互作用，在水热过程中形成了Ti-O-Si键。在TiO₂ 颗粒中添加二氧化硅可以有效抑制金红石相的形成和二氧化钛晶体的生长。漫反射光谱（DRS）表明，随着二氧化硅含量的增加，带隙跃迁增大。与纯TiO₂ 纳米颗粒相比，二氧化硅改性的TiO₂ 纳米颗粒表现出更好的光催化活性，且光催化活性随二氧化硅含量的增加而提高。由于具有更好的热稳定性，二氧化硅改性的TiO₂ 样品即使在1273 K煅烧后仍保持良好的光催化活性。
