Characteristics of electrochemical oxidation of phenol with Mn-Sn-Sb/γ-Al_2O_3 particle-electrodes
A three-dimensional electrode system for electrochemical oxidation was developed in which Mn-Sn-Sb complex metal oxides supported on γ-Al_2O_3 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.