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.
出处
《环境科学》
EI
CAS
CSCD
北大核心
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)
关键词
臭氧
紫外
硝基苯
乙酸
乙醇酸
降解
ozone
UV
nitrobenzene
glycolic acid
acetic acid
degradation
