用高温热水解法制备高活性TiO_2纳米微晶光催化剂

Preparation of High Photocatalytic Activity Nano-crystalline Titanium Dioxide by High Temperature Thermo-Hydrolysis Method

采用钛酸四西酯在有机溶剂中高温热水解与结晶同时进行的方法，制备了二氧化钛纳米微晶光催化剂．以XRD、BET、TEM、TG和DTA等方法对获得的微晶进行了表征．所制得的TiO2纳米微晶平均值径约为12nm，比表面积在100m2·g-1以上，并能在报宽的煅烧温度范围内保持锐钛矿型晶体结构．将它应用于光分解甲基橙，具有高的光催化活性．

Nano-crystalline titanium oxide(TiO2) was prepared by the high-temperature thermo-hydrolysis method and crystallized in organic media. Microcrystalline was characterized by TG-DTA, XRD, BET and TEM methods, the average diameter of this titanium dioxide is 12nm withthe surface area greater than 100m2.g-1, and the crystal is of anatase structure over a relativewide temperature range. The photocatalytic activity of this titanium oxide was determminated bymeasuring the rate of degradation of methyl orange and the rate of formation of degradation prod-uct. The results showed that this titanium oxide has much higher photocatalytic activity.