以钛酸四丁酯为钛源，硝酸银为银源，采用溶胶-凝胶法制备了掺银的纳米Ti02。用X射线衍射和透射电子显微镜对材料进行了表征，以掺银TiO2为催化剂对甲基橙进行了光催化降解实验。考查了催化剂掺银量、催化剂总用量、甲基橙溶液浓度及降解时间对甲基橙降解率的影响。结果表明，制得的样品颗粒细小均匀，3％掺银Ti02样品比表面积高达132．2m^2／g。掺银Ti02中的银钛原子摩尔比以及催化剂用量均影响光催化活性，银的掺杂量为3％时，纳米TiO2光催化活性最高，3％掺银TiO2催化剂最佳用量为0．3g/L。降解率随甲基橙初始浓度的增加而降低，随光照降解时间的增加而提高，光照20-30min之间．降解速度最快。%Using titanium butyl titanate as inorganic source and silver nitrate as doped material, silver - doped TiO2 nano - composite materials were prepared by sol - gel method. Chemical composition and structure of the materials were characterized by transmission electron microscopy and X - ray diffraction, and its photo - catalytic tion efficiency were investigated. The results showed that the sample particles is fine, the specific surface area of TiO2 which contains 3% silver mole fraction is 132.2 m2/g. Both the silver content and the catalyst dosage had effect on the degradation efficiency. The optimum silver mole fraction in the composite is 3% and the optimum catalyst dosage is 0.3 g/L. Increasing the initial concentration of methyl orange will decelerate solution＇ s degra- dation. The increasing of illumination time is favorable for methyl orange degradation. When the time is in 20 minutes to 30 minutes, the degradation rate increased significantly.
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