光催化
煅烧
金红石
热液循环
锐钛矿
二氧化钛
材料科学
X射线光电子能谱
化学工程
纳米颗粒
钛
水热合成
纳米技术
化学
催化作用
有机化学
复合材料
冶金
工程类
作者
Zhijie Li,Bo Hou,Yao Xu,Dong Wu,Yuhan Sun
标识
DOI:10.1016/j.jcis.2005.02.082
摘要
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.
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