【摘要】 紫外光/双氧水(UV/H2O2)复合氧化过程在废水处理领域有很广泛的应用前景,但动力学方面的研究较少,为此研究了UV/H2O2工艺降解苯酚废水的动力学。结果表明,苯酚在单独的紫外辐射(UV)、过氧化氢(H2O2)氧化和UV/H2O2协同下的降解均符合表观一级反应动力学。在单独的紫外辐射或过氧化氢氧化下苯酚去除速率很小, 而在复合氧化过程UV/H2O2工艺中有显著的提高,表明存在协同效应。苯酚去除的速率常数增强因子可达7.35。进一步从 UV/H2O2系统中存在的UV、H2O2和羟基自由基(OH)三部分协同作用的降解机理,推导出了简化的机理动力学模型,能很好地反映过氧化氢浓度过量条件下苯酚的降解。苯酚降解的动力学方程为: 5-55322022002.1410[HO]d[R]5.3310[R]2.0410[HO][R][R]d[R]rt---=-=+?更多还原

【Abstract】 Though UV/H2O2 process has showed potential application for waster treatment, there were only a few reports on degradation kinetics. In this paper, the synergetic kinetics of phenol wastewater treatment by using UV/H2O2 system was studied. It was found that phenol degradation followed pseudo-first order reaction under individual UV radiation, H2O2 oxidation and UV/H2O2 process. The removal rate of phenol was fairly low in the single UV radiation or H2O2 oxidation process, while it significantly enhanced in the combined UV/H2O2 system. This indicated that there exist synergetic effects in the UV/H2O2 process and it was found that the promoted factor for phenol degradation rate constant is about 7.35. A simplified mechanistic model for phenol degradation was derived accounting for the contribution of individual UV radiation, H2O2 oxidation and hydroxyl radical in the combined UV/H2O2 system. The model was proved to be well suitable for the phenol degradation in the presence of superfluous H2O2. The kinetic reaction equation was fitted as follows, 55322022002.1410[HO]d[R]5.3310[R]2.0410[HO][R][R]d[R]rt---=-=+?.更多还原