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.
出处
《中国环境科学》
EI
CAS
CSSCI
CSCD
北大核心
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
