O_3/UV降解水中有机物机理研究  

Study on the Mechanism of Ozonation of Organic Combination with UV Radiation

作　　者：童少平[1] 王梓[1] 马淳安[1] 

机构地区：[1]浙江工业大学化学工程与材料学院绿色化学合成技术国家重点实验室培育基地,杭州310032

出　　处：《环境科学》2007年第2期342-345,共4页Environmental Science

基　　金：国家自然科学基金项目(50578146)

摘　　要：利用O3/UV降解了水中的硝基苯、乙醇酸和乙酸.在硝基苯的降解过程中,当加入对H2O2具有催化分解作用的MnO2时,O3/UV降解效率明显下降,TOC的去除率甚至比单独臭氧化还低,在相同条件下处理40 min后,O3/UV、O3和O3/UV+MnO2对溶液TOC的去除率分别为44%、41%和39%.该结果表明中间产物H2O2对O3/UV降解效率的提高具有重要的作用.另外,有机物本身对自由基链反应是否具有促进作用也直接影响着O3/UV的降解效率,当目标有机物是对自由基链反应具有促进作用的乙醇酸时,O3/UV降解效率较高,30 min后乙醇酸的去除率即达76%;而当目标有机物是对自由基链反应具有抑制作用的乙酸时,O3/UV对其几乎无降解能力.Nitrobenzene, glycolic acid and acetic acid were selected to be degraded by O3/UV. During the degradation of nitrobenzene by O3/ UV, addition of MnO2, an effective catalyst to decompose H2O2 in water, decreased the degradation efficiency obviously, and the degradation efficiency of O3/UV was even lower than that of ozonation alone, for example, the TOC removal rates of nitrobenzene by O3/UV, O3 and O3/ UV ＋ MnO2 were 44%, 41% and 39% in 40 minutes, respectively. These results demonstrate that intermediate H2O2 plays an important role in enhancement of degradation efficiency of O3/UV. Furthermore, the characteristic of organic, which acts as promoter or inhibitor in the process of ozonation, also affects the degradation efficiency of O3/UV directly, when glycolic acid, a promoter in ozonation, was degraded, the combination UV radiation with ozonation could remove it effieiency, the removal rate of glycolic acid reached 76% in 30 minutes; however, when acetic acid, an inhibitor in ozonation, was degraded by O3/UV, the removal rate of acetic acid was very low, which was similar with that of ozonation alone.

关 键 词：臭氧 紫外 硝基苯 乙酸 乙醇酸 降解 

分 类 号：X131.2[环境科学与工程—环境科学]