SiO_2-TiO_2复合催化剂降解水体中的邻苯二甲酸二甲酯  

Degradation of Dimethyl Phthalate(DMP) in Aqueous Solution by SiO_2-TiO_2 Composite Photocatalyst

作　　者：景伟文[1] 刘义轩[1] 张欣茜[1] 

机构地区：[1]新疆农业大学化学工程学院,乌鲁木齐830052

出　　处：《新疆农业大学学报》2012年第1期70-74,共5页Journal of Xinjiang Agricultural University

基　　金：新疆维吾尔自治区高校科研计划青年教师科研启动基金(XJEDU2009S40);大学生创新基金

摘　　要：通过湿式机械混合法制备SiO2复合改性TiO2催化剂,光催化降解邻苯二甲酸酯实验的结果表明,复合比例为SiO2∶TiO2=1∶6～1∶9,焙烧活化600℃,2h所得的催化剂活性较好。对降解体系的研究表明,当催化剂的投加量为0.2～0.3g/L、pH=5～8时降解效率较高。邻苯二甲酸酯的初始浓度越高,SiO2-TiO2复合催化剂的降解效率则越低。并利用Langmuir-Hinshelwood动力学方程对表观反应速率常数(kapp)和半衰期(t1/2)进行了计算。This experiment was conducted to prepare SiO2-TiO2 composite photocatalyst by damp mechanical mixed method.The result of the experiment for photocatalytic degradative dimethylphthalate indicated that the composite ratio of SiO2 to TiO2 SiO2∶TiO2=1∶6~1∶9,the cativity of photocatalyst was higher under calcination activating treatment with 600 ℃ for 2 h.The study of degradation system showed that when the amount of catalyst was 0.2~0.3 g/L,solution pH value was 5~8,the degradation rate of solution can be higher.DMP photocatalytic degradation decreased with the increase of initial DMP concentration.Finally,the apparent rate constants（kapp） and half-life（t1/2）were calculated by Langmuir-Hinshelwood dynamics equation.

关 键 词：SiO2-TiO2复合催化剂 光降解 邻苯二甲酸二甲酯 

分 类 号：TB383[一般工业技术—材料科学与工程]