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US/H2O2系统协同降解苯酚的动力学研究
引用本文:史惠祥,赵德明,雷乐成,汪大翚. US/H2O2系统协同降解苯酚的动力学研究[J]. 化工学报, 2003, 54(10): 1436-1441
作者姓名:史惠祥  赵德明  雷乐成  汪大翚
作者单位:浙江大学环境工程研究所,浙江 杭州 310027;浙江工业大学化工与材料学院,浙江 杭州 310032 ;
基金项目:国家自然科学基金资助项目(No.20176053).
摘    要:超声波/过氧化氢(US/H2O2)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/H2O2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(H2O2)氧化和超声波/过氧化氢(US/H2O2)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/H2O2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6.904.进一步从US/H2O2系统中存在US、H2O2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.

关 键 词:超声波/过氧化氢  苯酚  协同效应  动力学  
文章编号:0438-1157(2003)10-1436-06
收稿时间:2002-11-11
修稿时间:2002-11-11

SYNERGETIC KINETICS OF PHENOL DEGRADATION IN WATER USING ULTRASONIC/H2O2 SYSTEM
SHI Huixiang,ZHAO Deming,LEI Lecheng,WANG Dahui. SYNERGETIC KINETICS OF PHENOL DEGRADATION IN WATER USING ULTRASONIC/H2O2 SYSTEM[J]. Journal of Chemical Industry and Engineering(China), 2003, 54(10): 1436-1441
Authors:SHI Huixiang  ZHAO Deming  LEI Lecheng  WANG Dahui
Abstract:Though the ultrasonic/H2O2 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/H2O2 system was studied. It was found that phenol degradation followed pseudo-first order reaction under individual ultrasonic radiation or H2O2 process, while it was significantly enhanced in the combined ultrasonic/H2O2 system. This indicated that there exist synergetic effects in the ultrasonic/H2O2 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, H2O2 oxidation and hydroxyl radical in the combined ultrasonic/H2O2 system. The model was proved to be well suitable for the phenol degradation in the presence of surplus H2O2.
Keywords:US/H2O2  phenol  synergetic effects  kinetics
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