制备条件对溶胶-乳化-凝胶法制备TiO_2颗粒尺寸的影响  

Effect of Preparation Conditions on the Size of TiO_2 Powders Prepared with the Sol-emulsion-gel Method

作　　者：周武艺[1] 唐绍裘[1] 张世英[2] 崔婷[1] 

机构地区：[1]湖南大学材料科学与工程学院,长沙410082 [2]长沙大学化学系,长沙410003

出　　处：《无机材料学报》2005年第3期587-592,共6页Journal of Inorganic Materials

基　　金：湖南省自然科学基金(03JJY4046)

摘　　要：用溶胶-乳化-凝胶法合成了纳米TiO2光催化剂粉末,探讨了制备条件:表面活性剂浓度、溶胶的pH值、水含量以及煅烧温度对其粒径的大小和粒度分布的影响.研究表明: 当表面活性剂达到临界胶束浓度时颗粒尺寸小且分布较均匀,当溶胶pH为8-9,水的浓度达到0.5mol/L后颗粒尺寸基本保持不变.此外,煅烧可以改善TiO2粉体的结晶度,促使由无定型向锐钛矿型以及金红石型转变,煅烧过程中,TiO2颗粒的形貌变化过程为:成型球体→棒状→球体→变形球体.Titanium dioxide photocatalyst powders were prepared with the sol-emulsion-gel method. The influence factors, such as surfactant concentration, pH values of solution, water content and calcination temperature, on the size and distribution- of TiO2 nanoparticles were investigated. The results show that TiO2 nanoparticles are very small when the concentration of the surfactant reaches the critical concentration of 9.20x10(-4) mol/L and a good distribution can be obtained. Nucleophilic reaction will occur in the basic solution for the Ti(OC4H9)(4), the TiO2 nanoparticles with the smallest size will be obtained when the pH value is 8.4. The size of TiO2 nanoparticles will decrease rapidly with the increasing of water and it will reach a steady constant when the water content is 0.5mol/L. The crystallinity of TiO2 nanoparticles can be improved by calcination, which makes the amorphous phase transform to anatase and rutile. The shape of the particles can be noticed as: Formed sphere -> Rod -> Sphere -> Distorted sphere.

关 键 词：溶胶-乳化-凝胶法 纳米TIO2光催化剂 制备 影响因素 

分 类 号：TF123[冶金工程—粉末冶金]