双功能铝催化降解MTBE的试验研究  

Degradation mechanism and kinetics of Methyl tert-butyl Ether (MTBE) by bifunction aluminum

作　　者：胡勤海[1] 毛柯辉[1] 陈艳[1] 熊云龙[1] 朱妙军[1] 张杏青[1] 

机构地区：[1]浙江大学环境工程系,浙江杭州310029

出　　处：《浙江大学学报（理学版）》2008年第1期63-67,共5页Journal of Zhejiang University（Science Edition）

摘　　要：采用双功能铝对MTBE进行降解试验.结果表明双功能铝通过氧化还原反应,能利用分子氧有效地降解MTBE.在各MTBE初始浓度条件下,经过24 h的反应,MTBE的去除率均可达到92%以上.酸性的环境条件(pH<3.5)比较适宜双功能铝对MTBE的降解,最佳初始pH约在2.0左右.实验检测到的降解产物有丙酮、叔丁醇、乙酸甲酯和甲酸异丁酯.动力学研究表明:MTBE的降解遵循表观一级反应动力学规律.Bifunctional aluminum was prepared by sulfating aluminum metal with sulfuric acid. The use of bifunctional aluminum to degrade MTBE has been examined by using batch system. At all initial concentrations, more than 92% of MTBE was degraded by bifunctional aluminum within 24 hours. Acidic condition （pH （3.5） was benefit for MTBE degradation, the optimal pH was - 2. 0. Primary degradation products were tert-butyl alcohol （TBA）, tert-butyl formate （TBF）, acetone, and methyl acetate. A postulated mechanism of the degradation is that sulfate acts as an electron carrier which transfers electrons from aluminum metal to dioxygen. Aluminum metal serves as the electron source for the reduction of oxidized sulfur species, thus creating an active site. The rate of MTBE degradation is in conformity with the first order kinetic law in appearance,and the half-life of reaction was less than 7.2 h. At an initial MTBE concentration of 1 mol/L, aluminum concentration of 10 g · L^-1 , pH of 2.0, the rate of MTBE degradation was 0. 1402 h^-1 , and the half-life of reaction was 4.94 h.

关 键 词：MTBE 双功能铝 分子氧 降解 动力学 

分 类 号：X131.2[环境科学与工程—环境科学]