摘要
采用SolGel法成功地合成了TiO2纳米粉末,并对其光催化性能进行了研究.XRD与TEM研究结果表明,热处理温度、保温时间等因素对材料结构和颗粒大小影响很大,粉末的平均粒径为8.0～29.5nm.以125W高压汞灯为光源,亚甲基蓝溶液的光催化降解为反应模型,随着热处理温度的升高,TiO2纳米颗粒变大,其光催化降解亚甲基蓝的速率反而提高.
TiO 2 nanometer powder with sizes ranging from 8.0?nm to 29.5 nm was prepared by sol gel process with Ti(OBu) 4 as the precursor. XRD and TEM showed changes in structure and particle size of the powder with calcination temperature and time. Based on a model reaction of photocatalytic degradation of methylene blue irradiated by 125?W high pressure mercury lamp, the photo catalytic degradation rates of methylene blue increased with a rise of calcination temperature and the increasing of nano powder sizes. As a result, the quantum size effect drastically influenced the photocatalytic activity of TiO 2 owing to the changes of crystalline pattern and optical absorption spectra.
出处
《华南理工大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
1999年第12期38-43,共6页
Journal of South China University of Technology(Natural Science Edition)
关键词
纳米粉末
光催化
量子尺寸效应
二氧化钛晶体
nanometer powder
titanium dioxide
photocatalysis
quantum size effect
