摘要
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TiO2。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TiO2样品比表面积高达132.2 m2/g。掺银TiO2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.
出处
《安徽科技学院学报》
2012年第2期56-60,共5页
Journal of Anhui Science and Technology University
基金
安徽省教育厅自然科学基金项目(KJ2010B298)
安徽科技学院重点建设学科项目(AKXK20102-2)
关键词
掺银量
光催化剂
溶胶-凝胶法
降解率
Content of silver
Photo - catalyst
Sol - gel method
Degradation efficiency
