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制备了三种n 型半导体氧化物TiO2 ,ZnO和Fe2 O3 纳米粒子 ,用X射线衍射和N2 吸附技术分别对它们的结构及比表面积进行了表征 .考察了三种氧化物粒子对庚烷的气相光催化氧化反应的催化活性 .研究表明 ,对于同种催化剂 ,随着焙烧温度的升高 ,催化剂的粒径增大 ,比表面积减小 ,光催化活性下降 .三种催化剂纳米粒子的光催化活性顺序为TiO2 (锐钛矿 )>ZnO >Fe2 O3 ,金红石型TiO2 粒子的催化活性低于ZnO粒子 .结合能带理论探讨了三种催化剂光催化活性差异的原因
Three kinds of n-type semiconductor oxide TiO 2, ZnO and Fe 2 O 3 nanoparticles were prepared, and their structures and specific surface area were characterized by X-ray diffraction and N2 adsorption respectively.The effects of three kinds of oxide particles on the gas phase of heptane The photocatalytic activity of photocatalytic oxidation was studied.The results showed that with the same kind of catalyst, with the increase of calcination temperature, the particle size of the catalyst increased, the specific surface area decreased and the photocatalytic activity decreased.The photocatalytic activity of the three kinds of catalyst nanoparticles The order of TiO 2 (anatase)> ZnO> Fe 2 O 3 is that the catalytic activity of rutile TiO2 particles is lower than that of ZnO particles. The reason for the difference in the photocatalytic activity of the three catalysts is discussed based on the band theory