几种光催化反应体系中羟基自由基表观生成率的实验研究  

An Experimental Study on the Production Efficiency of Hydroxyl Radicals by Several Photocatalysis Reaction Systems

作　　者：吴少林[1] 谢四才[1] 杨莉[1] 戴玉芬[1] 钟玉凤[1] 

机构地区：[1]南昌航空工业学院环境与化学工程系,江西南昌330034

出　　处：《感光科学与光化学》2006年第2期102-109,共8页Photographic Science and Photochemistry

摘　　要：采用邻二氮啡-Fe(II)(橙红色)分光光度法间接测定了Fenton、UV/Fenton、UV/草酸铁/H2O2、UV/TiO24种体系中在不同条件下.OH的表观生成率,初步探讨了体系中各影响因子的作用机制.结果分析表明:对于Fenton体系、UV/Fenton、UV/草酸铁/H2O2而言,其最佳反应条件为pH=4.0、m(H2O2)/m(Fe)=1/25、铁离子的质量浓度以25 mg/L左右为宜;TiO2光催化体系催化产生的.OH尽管受环境pH的影响相对较小,但在同等条件下.OH的表观生成率最低;4种体系中以UV/草酸铁/H2O2体系中.OH表观生成率最高,而且以线性的规律递增.By using a Phenanthroline Hydrate-Fe（Ⅱ）（salmon pink） Spectro-measurement to dictate the production efficiency of the hydroxyl radicals by the Fenton, UV/Fenton, UV/Fe（ Ⅲ ）-Oxalate/ H2O2 ,UV/TiO2 under the different conditions, analyzed the mechanism reaction of different major factors. The results show that the optimal reaction conditions were pH = 4.0, m（H2O2 ）/m（Fe） = 1/25, and quality concentration of iron about 25 mg/L for the Fentbn, UV/Fenton, UV/Fe（ Ⅲ ）- Oxalate/H2O2. The production efficiency of the hydroxyl radicals by UV/TiO2 was smaller changed with the change of the environmental pH relative Fenton,UV/Fenton,UV/Fe（ Ⅲ ）-Oxalate/H2O2, but the production efficiency of the hydroxyl radicals by UV/TiO2 was the lowest and UV/Fe（ Ⅲ ）- Oxalate/H2O2 was the best among the four mechanism reaction systems.

关 键 词：羟基自由基 光催化 分光光度法 

分 类 号：X703[环境科学与工程—环境工程]