Abstract: 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 particle-electrodes.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.

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.