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.
出处
《化工环保》
CAS
CSCD
北大核心
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)
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
photocatalytic oxidation
silicon dioxide
titanium dioxide
superacid
acidization
ultrasonic-assisted hydrolysis method
soaking method
