【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.更多还原

【Abstract】 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 efficiency,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.更多还原