摘要
采用微波无极紫外技术,以难降解硝基苯模拟废水为研究对象,考察了催化剂投加量、反应时间、微波功率和初始pH值等因素对硝基苯去除效果的影响。结果表明,采用微波无极紫外技术降解硝基苯的最佳条件为:催化剂投加量16 g/L、微波功率500 W、初始pH为5。在此条件下,降解8 min时,硝基苯去除率达99.2%。继续延长反应时间至20 min时,COD去除率达82.5%。同时,研究了硝基苯降解反应动力学,此降解过程符合一级反应动力学模型,反应速率常数k为0.608 min-1,半衰期为1.14 min,其反应增强因子为1.94,表明微波与无极紫外同时降解硝基苯时具有协同效应。
Electrodeless discharge lamp-assisted microwave catalytic degradation on nitrobenzene in simulated wastewater is studied.The influence factors,such as catalyst dosage,irradiation time,microwave power,and initial pH on degradation rate of nitrobenzene,are investigated.The optimal operating conditions are as follows： the catalyst dosage is 16 g/L,the microwave power is 500 W,and the initial pH is 5.After degradation for 8 min,the removal of the nitrobenzene is 99.2%.When the degradation time comes to 20 min under the optimal operating conditions,the COD removal is 82.5%.The kinetics study of degradation on nitrobenzene indicates that the degradation process accords with the first-order reaction kinetics.The reaction velocity constant k is 0.608 min-1,and the enhancement factor of the kinetics constant is 1.94.It is suggested that the microwave and the ultraviolet have a cooperative effect.
出处
《南京航空航天大学学报》
EI
CAS
CSCD
北大核心
2010年第4期510-514,共5页
Journal of Nanjing University of Aeronautics & Astronautics
基金
国家重大水专项子课题(2008ZX07101-003)资助项目
国家高技术研究发展计划("八六三"计划)重大专项课题(2007AA06A402)资助项目
江苏省普通高校研究生科研创新计划(CX09B-144Z)资助项目
关键词
微波
无极紫外灯
硝基苯
降解
microwave
electrodeless discharge lamp
nitrobenzene
degradation
