光催化
锐钛矿
金红石
材料科学
煅烧
化学工程
微晶
热分解
粒径
纳米颗粒
微乳液
钛
催化作用
无机化学
核化学
纳米技术
肺表面活性物质
化学
冶金
有机化学
工程类
作者
Seong‐Soo Hong,Man Sig Lee,Seong Soo Park,Gun-Dae Lee
出处
期刊:Catalysis Today
[Elsevier]
日期:2003-11-01
卷期号:87 (1-4): 99-105
被引量:145
标识
DOI:10.1016/j.cattod.2003.10.012
摘要
Nanosized pure TiO2 particles were prepared by hydrolysis of TTIP in the sodium bis(2-ethylhexyl)sulfosuccinate (AOT) reverse micelles. TiO2/SiO2 nanoparticles were also prepared from TEOS as a silicon source and TTIP as a titanium source. These particles were characterized by TEM, XRD, FT-IR, BET, TGA and DTA. From thermal analysis and XRD analysis, the anatase structure of pure titania appeared in the 300–600 °C calcination temperature range and the rutile structure was showed above 700 °C. However, no rutile phase was observed for the TiO2/SiO2 particles up to 800 °C. The crystallite size decreased and the surface area of TiO2/SiO2 particles monotonically increased with an increase of the silica content. From FT-IR analysis, the band for Ti–O–Si vibration was observed and the band intensity for Si–O–Si vibration increased with an increase of the silica content. The micrographs of TEM showed that the TiO2/SiO2 nanoparticles had a spherical and a narrow size distribution. In addition, TiO2/SiO2 particles showed higher photocatalytic activity than pure TiO2 and the TiO2/SiO2 (90/10) particles showed the highest activity on the photocatalytic decomposition of p-nitrophenol.
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