US/H2O2系统协同降解苯酚的动力学研究

超声波 过氧化氢 (US H2 O2 )复合氧化过程在废水处理领域有很广泛的应用前景 ,但在动力学方面的研究很少 ,为此研究了US H2 O2 工艺降解苯酚的动力学 .结果表明 ,苯酚在单独超声波辐射 (US)、过氧化氢 (H2 O2 )氧化和超声波 过氧化氢 (US H2 O2 )协同下的降解均符合表观一级动力学 .在单独的超声波辐射或者过氧化氢氧化下苯酚去除率很小 ,而在复合氧化过程US H2 O2 工艺中有显著的提高 ,表明协同效应存在 .苯酚去除的速率常数增强因子可达到 6 90 4 .进一步从US H2 O2 系统中存在US、H2 O2 和羟基自由基 (·OH) 3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 ,很好地反应过氧化氢浓度过量条件下苯酚的降解 .

SYNERGETIC KINETICS OF PHENOL DEGRADATION IN WATER USING ULTRASONIC/H2O2 SYSTEM

Though the ultrasonic/H 2O 2 process shows potential application for wastewater treatment, there were only a few reports on degradation kinetics In this paper, the synergetic kinetics of phenol degradation in water by using ultrasonic/H 2O 2 system was studied It was found that phenol degradation followed pseudo first order reaction under individual ultrasonic radiation or H 2O 2 process, while it was significantly enhanced in the combined ultrasonic/H 2O 2 system This indicated that there exist synergetic effects in the ultrasonic/H 2O 2 process and it was found that the enhancement factor for phenol degradation rate constant was about 6 904 A simplified mechanistic model for phenol degradation was derived by accounting for the contribution of individual ultrasonic radiation, H 2O 2 oxidation and hydroxyl radical in the combined ultrasonic/H 2O 2 system The model was proved to be well suitable for the phenol degradation in the presence of surplus H 2O 2