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采用沉淀 -浸渍法制备固体超强酸催化剂SO2 -4 /TiO2 纳米粒子 ,并用XRD、BET、XPS、UV -Vis漫反射光谱等对其特性进行表征 .以NO-2 为降解目标物 ,考察了SO2 -4 /TiO2 光催化氧化性能 .结果表明 ,SO2 -4 /TiO2 在高温下相结构稳定 ,TiO2 的超强酸化可增大比表面积 ,有利于反应物吸附 ,同时产生吸收带边蓝移及禁带宽度增加 ,从而 ,产生较大的氧化还原势 ,与TiO2 相比 ,光催化氧化活性显著提高 .焙烧温度6 0 0℃时催化剂活性最好 .
The solid superacid SO2-4 / TiO2 nanoparticles were prepared by precipitation-impregnation method and their properties were characterized by XRD, BET, XPS and UV-Vis diffuse reflectance spectroscopy.The effects of SO2 -4 / TiO2 photocatalytic oxidation.The results show that the phase structure of SO2-4 / TiO2 is stable at high temperature, and the super acidification of TiO2 can increase the specific surface area, which is favorable for the adsorption of reactants and the generation of absorption band edge blue shift and banned As a result, the photocatalytic oxidation activity was significantly increased as compared with TiO2, and the catalyst activity was best when the calcination temperature was 600 ℃.