TiO_2-SiO_2纳米复合粉体的制备、改性及其光催化性能  

Preparation and Modification of TiO_2-SiO_2 Nano-composite Powder and Its Photocatalytic Activity

作　　者：刘亚子[1] 杨绍贵[2] 夏晶[1] 

机构地区：[1]南京大学金陵学院化学与生命科学学院,江苏南京210089 [2]南京大学环境学院污染控制与资源化国家重点实验室,江苏南京210093

出　　处：《化工环保》2013年第5期442-446,共5页Environmental Protection of Chemical Industry

基　　金：江苏省自然科学基金资助项目(BK2012732)

摘　　要：采用超声辅助水解法制备了TiO2-SiO2纳米复合粉体。通过XRD和紫外-可见漫反射光谱分析发现,复合粉体TiO2-SiO2-2(n(Si)∶n(Ti)=10%)的光吸收带边发生明显蓝移。光催化降解甲基橙的实验结果表明:加入SiO2可明显提高复合粉体的光催化活性,且随着SiO2含量的增加,复合粉体的光催化活性逐渐提高;但SiO2含量过高会使光催化剂中TiO2光催化活性组分的质量分数减少,使光催化剂的活性下降;TiO2-SiO2-2光催化活性最高。采用浸渍法对复合粉体进行酸化改性得到的SO42-/TiO2-SiO2催化剂具有超强酸结构。酸化后催化剂的光催化活性提高,SO42-/TiO2-SiO2-2催化剂的光催化活性最高。TiO2-SiO2 nano-composite powder was prepared by ultrasonic-assisted hydrolysis method. The analysis results by XRD and UV-Vis diffuse reflectance spectra show that blue shift is displayed obviously in the light absorption band of the nano-composite powder TiO2-SiO2-2 （n（Si） ： n（Ti）=10%）. The experimental results show that： The photocatalytic activity of the nano-composite powder can be increased significantly by adding SiO2 and increased gradually with the increasing of SiO2 content; But when the SiO2 content is too high, the mass fraction of TiO2, which is the active component of the photocatalyst, will decrease; The photocatalytic activity of TiO2-SiO2-2 is the highest. The nano-composite powder was acid-modified by soaking method, and the photocatalyst SO4^2-/TiO2-SiO2 with superacid structure was obtained. The photocatalytic activity of the acidized photocatalyst is increased.

关 键 词：光催化氧化 二氧化硅 二氧化钛 超强酸 酸化 超声辅助水解法 浸渍法 

分 类 号：O643[理学—物理化学]