摘要
以磺胺嘧啶(SD)为研究对象,探讨了超声功率、初始浓度、pH值以及超声协同H2O2、Fenton、TiO2等组合工艺对超声降解SD效率的影响。实验结果表明,超声可有效降解水中低浓度的SD,尤其在酸性条件下,超声降解更为显著,降解过程遵循准二级反应动力学模型。加入H2O2或TiO2可在一定程度上促进SD的超声降解,加入Fenton试剂则显著提升SD的去除率。依据量化计算以及LC-MS测定结果,探讨了SD的超声降解机理。超声降解水中SD主要是基于.OH自由基的氧化过程。
The effects of ultrasonic power,initial concentrations,solution pH values and addition of oxidant H2O2,Fenton reagent,TiO2 on the degradation efficiency of SD by ultrasonic（US） were studied.Experimental results show that low-concentration SD can be effectively removed by ultrasonic in aqueous solution,the removal efficiencies can be remarkably enhanced in acidic solution,and the degradation of SD was in accordance with the pseudo-second-order kinetic model.In addition,H2O2 and TiO2 can promote ultrasonic induced degradation of SD to a certain extent.However,SD removal can be markedly improved with the addition of Fenton reagent.The degradation mechanism of SD was supposed by results of quantum chemical calculations and LC-MS.Ultrasonic induced degradation of SD is mainly ascribed to ·OH oxidation.
出处
《环境工程学报》
CAS
CSCD
北大核心
2012年第9期3143-3147,共5页
Chinese Journal of Environmental Engineering
基金
江苏省科技项目(BK2009414)
江苏省"青蓝工程"人才项目
江苏省环保科研课题(201017)
江苏省"六大人才高峰"资助项目
江苏省大学生实践创新计划项目(11CX006)
关键词
超声
降解
磺胺嘧啶
机理
ultrasonic
degradation
sulfadiazine
mechanism
