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用溶胶-凝胶法制备了不同TiO2含量的TiO2/MCM-41光催化剂,以罗丹明B为模拟有机污染物,对催化剂的光催化脱色性能进行了考察。用XRD、UV-Vis漫反射、N2吸附等方法对光催化剂进行了表征,结果表明:TiO2/MCM-41的比表面积和孔体积随TiO2含量的增加而减小,TiO2/MCM-41负载型催化剂上TiO2平均晶粒尺寸比纯TiO2的小。20%TiO2/MCM-41的光生电子-空穴分离效应最高,且光催化脱色活性最高。光催化反应体系中h+是主要的活性自由基,TiO2/MCM-41的光催化活性由材料的吸附能力和所含TiO2的光催化性能共同决定。
The TiO2 / MCM-41 photocatalysts with different TiO2 content were prepared by sol-gel method. The photocatalytic decolorization performance of the catalyst was investigated with rhodamine B as a simulated organic pollutant. The photocatalyst was characterized by XRD, UV-Vis diffuse reflectance and N2 adsorption. The results showed that the specific surface area and the pore volume of TiO2 / MCM-41 decreased with the increase of TiO2 content. The TiO2 / MCM-41 supported The average grain size of TiO2 on the catalyst is smaller than that of the pure TiO2. The photogenerated electron-hole separation effect of 20% TiO2 / MCM-41 is the highest, and the photocatalytic decolorization activity is the highest. The photocatalytic reaction system in which h + is the main active radical, the photocatalytic activity of TiO2 / MCM-41 is determined by the adsorption capacity of the material and the photocatalytic activity of TiO2.