臭氧氧化过程中羟基自由基产率测定与分析

Determination of hydroxyl radical yields in the ozone reactions

摘要:

为研究臭氧氧化过程中OH·的产生,利用“叔丁醇方法”测定了芳香类、胺类、烯烃类等活性物质与O₃反应过程中OH·的产率,并进一步测定了不同水体条件下O₃氧化过程中的OH·产率．结果表明:芳香类物质与O₃反应的OH·产率在10％～30％;胺类物质与O₃反应的OH·产率在15％～35％;烯烃类物质与O₃反应迅速,但基本没有OH·产生;OH-诱导O₃分解产生OH·的产率为41％．在不同水体的O₃氧化过程中,水中背景成分中DOC越高时OH·的产率越低,这是由于OH-与背景成分中有机活性物质相互竞争产生OH·．一般情况下,OH·的产率为地下水>地表水>污水厂二级出水．

Abstract:

To investigate the hydroxyl radical (OH·) formation during ozonation, OH· yields (Φ) in the reactions of O₃ with O₃ reactive compounds such as electron-activated aromatic compounds and amines were determined by the “tBuOH· assay”. In addition, the Φ values in the ozonation of waste water effluent, surface water and groundwater were investigated. The results showed that the Φ values in the reactions of aromatic compounds, amines and olefins with ozone were in the range of 10％-30％, 15％-35％ and 0, respectively. The Φ value was about 41％ in the reaction of hydroxyl ion (OH-) with ozone. Competition of OH- with water matrix for O₃ consumption resulted in lower Φ value in waters with higher content of DOC. Generally, the Φ values were in the trend of groundwater> surface water> waste water effluent.