纳米TiO_2/凹凸棒土复合体的制备及其表征

Preparation and characterization of nano TiO_2-attapulgite composites

以凹凸棒土(ATP)为载体,采用溶胶-凝胶法制备纳米TiO2/ATP复合型催化剂.利用扫描电镜(SEM)、热重-差热分析(TG-DSC)、X射线衍射分析(XRD)等分析测试手段对其组成、结构、尺寸进行分析和表征.结果表明,该复合材料由ATP和锐钛矿型的纳米TiO2组成,其中TiO2纳米粒子尺寸在20~30 nm之间,比相同工艺条件下的无负载的TiO2纳米粒子尺寸小;在该纳米复合材料中,纳米TiO2颗粒间不发生团聚,并且与ATP间结合牢固.

Titanium dioxide-coated attapulgite was prepared via sol-gel method by a carrier of attapulgite.The as-prepared composites were characterized with regard to their components,structure,size by scanning electron microscopy(SEM),differential thermal analyzer(TG-DSC) and X-ray diffraction(XRD).The results show that TiO2/attapulgite composites are mainly composed of anatase crystalloid TiO2 and attapulgite.The average nanometer size of TiO2 grains of composites is about 20～30 nm,which is smaller than that of TiO...