Preparation Of Lanthanon Doped PbO₂/Ti Electrode And Performance Of Electrocatalytic Nitrobenzene

In the field of wastewater treatment industry, electrocatalytic oxidative methods have attracted ever-increasing interests due to their environmental compatibility and amity, especially their direct or indirect oxidation of bio-refractory organic pollutants. Virtually, electrodes play important roles in electrocatalytic oxidative processes, so that it is especially essential to find and prepare proper material for electrodes.In this thesis, a large number of experiments were carried out to optimize technology for electrode preparation. Attempt to improve solvent for preparing undercoat was studied. Three kinds of PbO₂/Ti electrodes were prepared by anodic electrodeposition, which were coated by the oxides of Bi^α+,Ce^β+ or La^γ+. Electrocatalytic characteristic of these electrodes were investigated by its degradation of phenol wastewater and electrode lifetime. Try to increase the efficiency of organic sewage degradation and reduce energy consumption of electrolytic apparatus by optimize electrode preparation, an attempt of electrochemical degradation of organic pollutants in wastewater was applied on the experiments.The experiment results that Ce²⁺doped PbO₂/Ti electrode obtained high electrocatalytic activity and stability, i.e. 83.5% phenol removal rate and electrode lifetime of 41.5 h were achieved respectively, in the condition of current density 30mA/cm2, electrolysis time 60 min and phenol concentration 20 mg/L. The micrographs,element analysis,the crystal structure on the surface of electrode and the electrocatalytic performance of the electrodes were analyzed by SEM, EDX, XRD and the Potentioatat. The results showed that the crystal granule of Bi^α+ doped PbO₂/Ti electrode was uniformity and much smaller. Ce²⁺ doped PbO2/Ti electrode made the more uniformity crystal distribution and stable solide structure , although the dimension of crystal particle wasn't still change, however, La^γ+ doped PbO₂/Ti electrode did harmful to the electrocatalytic activity of electrode because the dimension of crystal granule was disunity,more larger and even . The results of Potentioatat suggested that...