【摘要】 为了考察煅烧温度对TiO2结构和光催化活性的影响,以酞酸丁酯作为前驱体,利用溶胶-凝胶法在不同煅烧温度下制备TiO2,并用亚甲基蓝测试其光催化活性。TG热重分析表明,450~700℃时TiO2有晶型变化,XRD表征说明,TiO2晶型受煅烧温度影响显著,其中450~600℃煅烧制备的TiO2为锐钛矿型,650℃煅烧时TiO2出现金红石晶型;亚甲基蓝光解实验结果表明,煅烧温度显著影响TiO2的光催化活性,其中,450~600℃煅烧TiO2对亚甲基蓝光解效果较好,光降解2.5h后降解率高达95%~97%;550℃煅烧制备的锐钛矿型TiO2对2-氯苯甲酸有一定光解催化效果,紫外光解4h后降解率高达80%左右,光解过程符合零级动力学模式。更多还原

【Abstract】 In order to investigate the influence of calcination temperature on the structure and photocatalytic activity of TiO2,nanometer titania photocatalysts have been prepared with sol-gel technique by using dibutyl phthalate as the precursor.Methylene blue was used to evaluate photocatalytic activity of TiO2. TG analysis results showed that the phase transition from anatase to rutile occurred during the temperature range of 450 ~ 700 ℃. XRD analysis results demonstrated that TiO2 crystal structure was affected by temperature obviously. TiO2 anatase crystal structure could be obtained in 450 ~ 600 ℃,and TiO2 rutile crystal structure occurred at 650 ℃. Photocatalytic degradation of methylene blue test described that calcination temperature had a great influence on TiO2 photocatalytic activity. Using TiO2 calcined at 450 ~ 600 ℃,the methylene blue photodegradation rate could reach 95% ~ 97% after 2. 5 h. The 2-chlorobenzoic acid photodegradation rate could reach 80%after 6 h using TiO2 calcined at 550 ℃,and the photodegradation process agreed to zero-roder reaction kinetics model.更多还原