负载型TiO_2光电催化降解孔雀石绿的动力学研究  

Study on Kinetics of Photoelectrocatalytic Degradation of Supported TiO_2 on Malachite Green

作　　者：张小娜[1] 周少奇[1,2,3] 周晓[1] 

机构地区：[1]华南理工大学环境科学与工程学院,广州510006 [2]华南理工大学亚热带建筑科学国家重点实验室,广州510641 [3]污染控制与生态修复广东省普通高等学校重点实验室,广州510006

出　　处：《环境科学》2013年第1期188-193,共6页Environmental Science

基　　金：广州市重大科技项目(2008DLB2080500);广东省教育厅高层次人才计划项目;亚热带建筑科学国家重点实验室项目(2012ZB06;2013ZC03)

摘　　要：以钛酸四丁酯(TBOT)为钛源,硝酸镧为镧源,尿素为氮源,采用溶胶-凝胶法合成了La-N共掺杂的TiO2光催化剂,并探究了其对孔雀石绿氧化降解的性能.结果表明该反应遵循一级动力学,得到动力学模型;其中外加偏电压的反应分级数(0.935 8)高于pH的反应分级数(0.611 9)以及初始浓度的反应分级数(0.335),表明外加偏电压对反应的影响最大.模型值与实验值吻合良好(R2为0.910～0.996 1),说明该反应动力学模型能较好地描述光电催化降解孔雀石绿过程.La-N co-doped TiO2 photocatalyst was synthesized by a sol-gel method,which used tetrabutyl titanate（TBOT） as the Ti resource,lanthanum nitrate as the La resource and urea as the N resource.The performance in the photocatalytic oxidation degradation of malachite green was investigated.The results showed that the reaction could be reasonably represented by first order kinetics,and a kinetic model was established;the reaction order of voltage（0.935 8） was higher than that of pH（0.611 9） and that of initial concentration（0.335）,indicating that voltage has the greatest impact on the reaction.The model data fitted well with experimental data（R2 0.910-0.996 1）,which indicates that the kinetic model can well describe the process of photocatalytic degradation of malachite green.

关 键 词：孔雀石绿 La-N共掺杂 TIO2 光电催化 动力学 

分 类 号：X52[环境科学与工程—环境工程]