微波强化臭氧氧化降解苯酚动力学研究  

Kinetics of phenol degradation in water using microwave/O_3 system

作　　者：赵德明[1,2] 张建庭[2] 金宁人[2] 徐新华[1] 

机构地区：[1]浙江大学环境与资源学院,浙江杭州310027 [2]浙江工业大学化学工程与材料学院,浙江杭州310032

出　　处：《浙江大学学报（工学版）》2011年第4期770-774,共5页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(20877066);中国博士后科学基金资助项目(20100471716);浙江省自然科学基金资助项目(Y5100075)

摘　　要：研究微波强化臭氧(MW/O3)系统下主要影响因素如臭氧投量、微波功率、pH值及温度等对苯酚降解效果和动力学的影响.结果表明:在单独的微波辐射下苯酚去除率很小,在复合氧化过程MW/O3工艺中有显著的提高,表明微波对臭氧氧化存在明显的强化作用;在单独微波辐照或者臭氧氧化工艺和MW/O3强化氧化系统中苯酚的降解均符合拟一级动力学关系,其中MW/O3氧化系统苯酚去除的速率常数增强因子可以达到3.6,降解机理类似臭氧氧化苯酚的降解过程,羟基自由基氧化机制为主.通过实验推导出简化的与pH值、臭氧投量、微波功率和反应温度等因素相关的苯酚降解动力学模型.The mainly influential factors on the removal rate and synergetic kinetics of phenol degradation in water by using the microwave enhanced ozonation （MW/O3） system were studied. Results showed that the removal rate of phenol degradation was lower under individual microwave ultrasonic radiation, while it was significantly enhanced in the combined MW/O3 system. There existed obviously enhanced effects in the MW/O3 process. In all cases, the degradation of phenol followed pseudo-first-order kinetics reaction, with the enhancement factor of the pseudo-first-order kinetics constant being around 3.6 in the combined MW/O3 system. The phenol degradation mechanism in MW/O3 system was greatly similar with that in ozonization oxidation process, and hydroxyl radicals oxidation was dominant. A simplified model for phenol degradation kinetics was derived by accounting for the contribution of pH value, ozone dose, microwave power and reaction temperature in the MW/O3 system.

关 键 词：微波 臭氧 苯酚 强化作用 动力学 

分 类 号：X78[环境科学与工程—环境工程] TQ209[化学工程—有机化工]