量子尺寸TiO_2/SiO_2复合微粒的制备与光催化性能研究  

Preparation of Quantum-size Complex Particles And the Research of its Photocatalytic Activity

作　　者：金华锋[1] 鲁绪会[1] 罗文谦[1] 李延霞 

机构地区：[1]安康师范专科学校化学系 [2]安康泸康酒业有限公司,陕西安康725000

出　　处：《安康师专学报》2001年第2期44-46,53,共4页Journal of Ankang Teachers College

摘　　要：采用改进的溶液—凝胶方法 ,制备出TiO2 及不同配比的TiO2 /SiO2 粉末 ,利用XRD、BET、UV -vis等手段研究了微粒的表面结构形态变化 ,以及对污染物NO-2 光催化降解的影响 .研究表明 ,TiO2 /SiO2 复合微粒的光催化活性明显高于TiO2 微粒 ,并且质量比m (Ti)∶m (si) =2∶1时催化降解NO-2 最佳 .制得TiO2 微粒以锐钛型高度分散在SiO2 网络中 ,粒径约 12nm ,并与SiO2 形成Si-O -Ti桥氧结构 ,提高了TiO2 微晶的热稳定性 .UV -vis吸收光谱显示复合微粒的光谱吸收发生蓝移 。TiO 2/SiO 2 complex particles of different mass ratio were prepared by the improved sol-gel method. And XRD, BET, UV-vis spectra investigation were used to research the characteristic changes of particles and the photocatalytic reactivity of these catalysis were higher than TiO 2, [m(Ti):m(si)=2:1] is the best. The TiO 2 particles existed in the low crystalline anatase phase with the size being about 12nm and formed Si-O-Ti. These catalysts had high photocatalytic reactivity. UV-vis spectra investigation indicate that complex light obsorption became blue shift and it is most useful to hetevogenous photocatalysis of pollutants.

关 键 词：量子尺寸 制备 光催化性能 复合微粒 纳米微粒 光催化剂 光降解 二氧化钛 二氧化硅 环境污染物 

分 类 号：O643.36[理学—物理化学] X131[理学—化学]