| O3/UV降解水中有机物机理研究 |
| 摘要点击 1420 全文点击 1224 投稿时间：2006-03-13 修订日期：2006-03-13 |
| 查看HTML全文
查看全文 查看/发表评论 下载PDF阅读器 |
| 中文关键词 臭氧 紫外 硝基苯 乙酸 乙醇酸 降解 |
| 英文关键词 ozone UV nitrobenzene glycolic acid acetic acid degradation |
|
| 中文摘要 |
| 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. |
| 英文摘要 |
| 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. |
|
|
|
