Mn-Sn-Sb/γ-Al_2O_3粒子电极对苯酚的降解特性  

Characteristics of electrochemical oxidation of phenol with Mn-Sn-Sb/γ-Al_2O_3 particle-electrodes

作　　者：张芳[1] 李光明[1] 张志刚[1] 胡惠康[1] 盛怡[1] 

机构地区：[1]同济大学污染控制与资源化研究国家重点实验室,上海200092

出　　处：《化工学报》2006年第10期2515-2521,共7页CIESC Journal

基　　金：国家自然科学基金项目(50378066);上海市教委曙光计划项目(03SG17).~~

摘　　要：研制了复合氧化物负载型Mn-Sn-Sb/γ-Al2O3粒子电极并填充于主阴阳极之间,实现了三维电催化氧化反应,并采用XRD、SEM对粒子电极进行了表征·结果表明,该粒子电极对目标污染物苯酚显示了良好的电催化活性和稳定性,在相同反应条件下,不加粒子电极的二维电解时苯酚的降解率为55·6%,而三维电催化氧化过程中降解率为90·8%,大大提高了苯酚去除效果·研究苯酚降解的动力学规律表明,苯酚降解符合表观一级反应动力学规律·利用GC-MS分析了苯酚降解主要中间产物为异丁酸、丙二酸、对苯醌、丁烯酸、乙二酸、顺丁烯二酸、丁二酸、邻苯二酚、对苯二酚及间苯二酚等,并据此推测了苯酚电催化氧化的可能反应途径.A three-dimensional electrode system for electrochemical oxidation was developed in which Mn-Sn-Sb complex metal oxides supported on γ-Al2O3 were packed between the two main electrodes. X-ray diffraction （XRD） and scanning electron microscope （SEM） were used to characterize the particleelectrodes. The two-dimensional electrolysis efficiency of phenol degradation without particle-electrodes was 55.6%, while the phenol degradation efficiency with three-dimensional particle-electrodes reached 90.8%. The results showed that the particle-electrodes had good electrocatalytic activity and stability for the degradation of phenol. It was found that phenol degradation followed a pseudo-first-order reaction kinetic model. Analysis of the treated aqueous solution was conducted with GC-MS, and the main intermediates during phenol degradation were isobutyric acid, malonic acid, benzoquinone, butenoic acid, oxalic acid, maleic acid, succinic acid, hydroquinone, catechol and resorcin. According to the GC-MS analysis, a possible pathway for the electrochemical oxidation of phenol was presented.

关 键 词：电催化氧化 粒子电极 废水处理 苯酚 动力学 

分 类 号：X703[环境科学与工程—环境工程]