响应面优化C掺杂TiO_2制备及光催化降解甲基橙

Preparation of Carbon Doped TiO_2 and Photocatalytic Degradation of Methyl Orange with Reaction Surface Method to Optimization

采用钛酸四丁酯水解-共沉淀方法成功制备出C掺杂纳米TiO_2光催化剂,对其形貌和成分进行了表征,同时采用响应面法对催化剂制备的条件进行了分析。结果表明:煅烧温度平方、负载次数和水钛摩尔比例影响较大,可以采用修正的二次幂函数对模拟底物甲基橙去除率进行拟合表征。催化剂制备最佳条件为:水钛摩尔比为1∶20.86,煅烧温度为337.31℃,负载1次,采用该条件制备催化剂反应30 min,模拟太阳光降解甲基橙脱色率可达98%以上。

Carbon doped nano-TiO2(C-TiO2) photo catalyst was synthesized by using tetrabutyl titanate hydrolysis and coprecipitation method. The morphology and the component of C-TiO2 had been obtained and the optimal condition of catalyst preparation also was found by the response surface method. The results show that the temperature, the loading reaction time and the molar ratio of H2 O2 and Ti have large influences on the photo catalyst efficiency on degradation of organic pollution.The modified quadratic function can be used to simulate the removal rate changing of model pollution of methyl orange during the photo catalytic reaction. Optimal catalyst preparation condition is H2 O2 and Ti mole ratio 1∶20.86, calcinations temperature 337.31 ℃ and loading reaction 1 time. The catalyst with this synthesis condition was used as photo catalytic to degradation of methyl orange solution. The methyl orange decolorization rate can reach more than 98% by simulated sunlight irradiation in 30 min.