载银TiO_2催化剂上Aroclor1260的光催化降解  

Photocatalytic degradation of aroclor1260 on Ag-loaded TiO_2.

作　　者：李春雷 麦碧娴[2] 潘海祥[1] 林峥[2] 贾可欣[1] 

机构地区：[1]有机地球化学国家重点实验室 [2]广东省环境资源利用与保护重点实验室

出　　处：《中国环境科学》2002年第2期123-127,共5页China Environmental Science

基　　金：国家自然科学基金资助项目(49602031);中国科学院广州分院分析测试基金资助项目

摘　　要：以载银TiO2为催化剂,以紫外光为激发光源,考察了溶液的pH值和溶液中Fe3+﹑Fe2+﹑Mn2+等金属离子浓度对Aroclor1260降解速率的影响.结果表明,酸性条件更有利于Aroclor1260的光解作用,而且多数PCB单体在pH值为4时有最大的光解速率.所考察的3种金属离子对于Aroclor1260的光解作用都有较大的影响.其中Aroclor1260的光催化降解速率随Fe3+离子浓度的变化符合表观一级反应动力学规律;Fe2+和Mn2+的影响作用十分相似,并呈U型影响趋势,即低浓度的促进作用和高浓度的抑制作用.The effects of pH of solution and concentration of metal ions, Fe3+、Fe2+ and Mn2+ on the photocatalytic degradation (PD) of Aroclor1260 were investigated with Ag-loaded TiO2 as catalyst and UV as light source. The results showed that acid condition was more favorable for the PD of Aroclor1260, and most PCB congeners had biggest PD rate when pH was 4. All of the three kinds of metal ions investigated had more effects on the degradation. There was apparent first order reaction kinetic rule between the change of Aroclor1260 PD rate with Fe3+ concentrations. Fe2+ and Mn2+ had very simpler effect tending to U-form-like. that is improving at lower concentrations and hindering at higher concentrations.

关 键 词：载银TIO2 Aroclor1260 金属离子 光解速率 

分 类 号：X511[环境科学与工程—环境工程]