摘要
采用溶胶－凝胶法控制制备了晶粒尺寸从１０ｎｍ到８０ｎｍ的二氧化钛纳米半导体．用光催化降解苯酚作为模型反应，结合ＸＲＤ，ＤＲＳ，ＦＳ等表征手段，研究了纳米ＴｉＯ２的制备条件与其晶粒尺寸和相结构的关系，探讨了纳米ＴｉＯ２尺寸效应对其光催化活性的影响．发现当晶粒尺寸小于１６ｎｍ时，二氧化钛半导体具有了明显的尺寸量子效应．尺寸量子效应对提高ＴｉＯ２光催化降解苯酚的催化活性起了极为重要的作用．
Some TiO2 nanoparticle samples with size range from 108 nm to 817 nm were prepared by solgel method with Ti(OBu)4 as the precursor. The influence of the preparation conditions on the size and the crystalline phase of the TiO2 crystallite was studied by means of Xray diffraction (XRD) technique, and the optical properties of the TiO2 samples were characterized by diffuse reflectance spectroscopy (DRS) and fluorescence spectroscopy (FS). Quantum size effect was observed for the TiO2 samples with crystallite size less than ca. 16 nm which was determined by DRS and FS. These TiO2 samples were also performed as a photocatalyst in degradation of phenol. In the size range 10 nm～30 nm, the photocatalytic activity increases drastically with the decreasing of the crystallite size, indicating that quantum size effect plays a very important role in improving the photocatalytic activity of the TiO2 samples with small crystallite size.
出处
《催化学报》
SCIE
CAS
CSCD
北大核心
1998年第3期229-233,共5页
基金
国家自然科学基金
中国科学院"九五"重大项目资助
关键词
二氧化钛
晶粒尺寸
纳米半导体
催化剂
光催化剂
Titanium dioxide, Crystallite size, Quantum size effect, Phenol, Photocatalysis, Degradation
