| The In doped Ti/Sb-SnO2were prepared by a sol-gel process . The electro-catalytic performances of the electrodes were evaluated based on the disposal efficiency.The effects of the calcination temperature and doping amount of In on the performances of the electrodes were also investigated. The results showed that the suitable calcination temperature was 600℃and the best doping amount of In was determined with the molar ratio of Sn:Sb:In being 100:10:0.15.Then the surface morphology, chemical compostion and the crystal structure of the electrodes were analyzed by SEM and XRD. The oxygen evolution potentials of both the blank electrode and the Ti/Sb-SnO2 electrode doped with In were investigated by polarization curve. Electrode life was also measured by damaged checking method. The results show that the Ti/Sb-SnO2 electrode doped In has higher oxygen evolution potential and longer electrode life than the blank electrode.We use the In doped Ti/Sb-SnO2 electrode as anode and the titanium plate as cathode to degrade stimulant p-nitrophenol waste water in a glass trough. The effects of reaction time,current density,electrolyte concentration and pH on degradation were systematically investigated. The results indicated that the degradation efficiency increased with the reation time and the tends became smooth when the raction time reached to certain degree. The degradation efficiency reached 97.2% when the reaction time was 120 min. the lower degradation efficiency. And the degradation efficiency also increased with the increasing of incurrent density. But after the current density reached 20mA/cm2,the degradation efficiency would lower with the occurrence of negative effect. The higher electrolyte concentration of p-NP, the higher degradation efficiency. And after the electrolyte concentration reached 0.03mol/LNa2SO4,the degradation efficiency would not increase. The degradation efficiency of p-NP was higher in the acidic conditions when compared to alkaline and neutral conditions.The results indicated that the optimum time was 120min,the optimum electrolyte concentration was 0.03 mol/L Na2SO4,and the optimum current density was 20 mA/cm2. It also showed that the degradation of the p-NP conformed to the first order kinetics. With the help of HPLC and IC, the intermediate products of p-NP were detected, base on which, the reaction process was presumed. |
