电助光催化氧化过程中羟基自由基(OH·)的定量分析  

Quantitative analysis of OH· generated in electrically assisted photocatalysis

作　　者：王海燕[1] 蒋展鹏[1] 杨宏伟[1] 

机构地区：[1]清华大学环境科学与工程系

出　　处：《环境工程学报》2008年第2期225-228,共4页Chinese Journal of Environmental Engineering

摘　　要：电助光催化氧化技术是一种增强型的光催化氧化技术,应用前景广阔。对电助光催化氧化过程中产生的羟基自由基(OH.)进行定量分析对进一步探讨电场辅助作用机理十分重要。以对氯苯甲酸为探针化合物对电助光催化氧化过程中的OH.进行定量分析,发现电助光催化氧化过程中的OH.浓度是普通光催化氧化过程的2倍。对苯甲酰胺进行电助光催化氧化降解试验,求得了苯甲酰胺与羟基自由基的二级反应动力学常数。研究还对电场辅助作用机理进行了分析。Electrically assisted photocatalysis（EAP） is one of the enhanced photocatalysis technology with wide application field. The quantitative analysis of hydroxyl radical （OH·） generated in EAP is very important for the research of EAP mechanism. This paper aimed at the quantitative analysis of OH· generated in EAP through probe compound method taking o-chlorine benzoic acid as the probe compoud. It was found that the concentration of OH · in EAP was twice larger than that in photocatalysis. The second order reaction dynamics constant of benzamide reacting with OH· was worked out through the degradation experiment of benzamide by EAP. The mechanism of EAP was analyzed.

关 键 词：光催化 电助光催化 羟基自由基 

分 类 号：X705[环境科学与工程—环境工程]