Ti_nO_(2n-1)电极电催化氧化有机污水中二甲基苯酚的探究

Electrocatalytic Oxidation of Ti_nO_(2n-1) Porous Electrodes for Dimethylphenol in Organic Pollutants

从Ti_nO_(2n-1)电极的制备入手,以Ti H2与Ti O2为合成原料,采用高温压片-真空烧结法制得Ti_nO_(2n-1)多孔电极。通过SEM、XRD技术对电极进行了表征,随后利用电化学测试方法考察了Ti_nO_(2n-1)电极的性能,并设计了有机污染物处理试验考察了电极的电催化氧化效能。结果显示:自制得到了主相为Ti4O7的Ti_nO_(2n-1)多孔电极,将自制的Ti_nO_(2n-1)多孔电极与石墨电极分别进行电化学测试,Ti_nO_(2n-1)电极的析氧电位保持在2.25 V左右,石墨电极仅为1.60 V、电化学稳定性等指标均优于石墨电极。在二甲基苯酚(DPM)模拟污水的电催化氧化过程中,Ti_nO_(2n-1)电极在105 min内对DPM的消解率达到93.1%,对COD的去除率达到84%,反应过程符合一级动力学过程。

In this paper,starting from the preparation of TinO2n-1 electrode,using Ti H2 and TiO2 as synthetic raw materials,TinO2n-1 electrode was prepared by the high-temperature compression-vacuum sintering method. The characterization of the material was carried out by SEM and XRD techniques,and the performance of the TinO2n-1 electrode was investigated using an electrochemical test method. Moreover,an organic pollutant treatment experiment was designed to investigate the electrocatalytic oxidation performance of the electrode. Results showed that the homemade porous TinO2n-1 electrode possessed the main phase of Ti4 O7. The as-prepared TinO2n-1 porous electrode and the graphite electrode were tested by electrochemical methods. The oxygen evolution potential of the TinO2n-1 electrode was maintained at about 2.25 V,while that of graphite electrode was only at 1.60 V,revealing that the catalytic activity,electrochemical stability,and electrochemical window of the TinO2n-1 electrode were superior to those of the graphite electrode. Furthermore,in the process of electrocatalytic oxidation of organic pollutants,the dissolution efficiency of dimethylphenol( DPM) reached 93.1% within 105 min and the removal efficiency of COD reached 84%. The reaction process conformed to the first-order kinetics process.