摘要
采用芬顿氧化工艺降解水中污染物甲基叔丁基醚(MTBE),使用Box-Behnken设计方法进行实验设计,基于响应面分析考察了MTBE初始浓度、H_2O_2浓度、Fe^(2+)浓度、反应时间和pH等条件对MTBE降解率的影响,对反应条件进行了优化。结果表明,在MTBE初始浓度1.1 mmol·L^(-1)、H_2O_2浓度18.0 mmol·L^(-1)、Fe^(2+)浓度3.0 mmol·L^(-1)、反应时间20 min、溶液pH=3.0时,MTBE降解率高达99.3%,与模型预测结果较接近,表明模型具有较好的模拟和预测能力。MTBE芬顿氧化过程检出了乙酸甲酯、叔丁醇和丙酮等中间产物,推测其主要降解过程有两种途径:一是在甲氧基上发生反应,生成甲酸叔丁酯、叔丁醇和丙酮;二是在甲基上发生反应,生成乙酸甲酯和丙酮。
Fenton oxidation process is applied for methyl tert-butyl ether (MTBE) degradation.The experimental design is established by Box-Behnken design method (BBD) of response surface methodology(RSM),where influencing factors,namely MTBE initial concentration,H 2O 2 concentration,Fe^2+ concentration,reaction time and solution pH are fitted.Optimized results show that at initial concentration 1.1 mmol·L^-1,H 2O 2 concentration 18.0 mmol·L^-1,Fe^2+ concentration 3.0 mmol·L^-1 reaction time 20 min and pH of 3.0,the degradation rate of MTBE reaches 99.3%,which is consistent with prediction,indicating good simulation and a forecasting model.Intermediates,namely methyl acetate,tert-butanol and acetone are detected during degradation.Thus it is speculated that there are two main pathways.One occurs on the methoxy group producing tert-butyl formate,tert-butyl alcohol and acetone;the other is on the methyl group,producing methyl acetate and acetone.
作者
戴竹青
戴巍
杜尔登
王明新
DAI Zhuqing;DAI Wei;DU Erdeng;WANG Mingxin(School of Environmental & Safety Engineering,Changzhou University,Changzhou 213164,China;Viva Biotech (Shanghai) Ltd.,Shanghai 201203,China)
出处
《常州大学学报（自然科学版）》
CAS
2019年第3期71-79,共9页
Journal of Changzhou University：Natural Science Edition
基金
国家自然科学基金资助项目(41641032)
关键词
甲基叔丁基醚
芬顿氧化
响应面分析
降解机理
methyl tert-butyl ether
Fenton oxidation
response surface analysis
degradation mechanism
