Preparation And Research Of Titanium-substrated Lead Dioxide Electrode For The Simulated Electrocatalytic Dye Wastewater Treatment

Dye wastewater has features of high chroma, complex composition, high toxicity, less-biodegradability, and large variation in quality and quantity. As one of the points in the degradation of industry wastewater, dye wastewater is difficult to be treated by common methods. Therefore, treatment of dye wastewater has always been a problem in dye industry.Electrocatalytic oxidation technology has played an increasing prominent role in treating dye wastewater, and has been considered to be one of the most promising water treatment technologies. Electrode materials have been one of the key factors of the electrocatalytic oxidation technology. Focusing on the problem mentioned above, in this thesis, the direct current electrodeposition method and the pulse electrodeposition method were used to prepare four kinds of Ti/PbO2 electrodes and studied the electro-catalytic property and the accelerated life.The direct current electrodeposition method was used to prepare Ti/PbO2 electrode in different temperature and CNT-Fe modified Ti/PbO2 electrode. And the electrode performance was examined by some characterizations and tests including SEM, XRD, electrochemical performance measurements, the accelerated life test and so on. The results showed that the optimal deposit temperature was determined, which is 40 ?. Ti/PbO2 electrode and Ti/PbO2-CNT-Fe electrode were used to remove methyl orange, methylene blue and acid orange. The degradation efficiency of methyl orange is greater than those of acid orange and methylene blue after 70min processing. The degradation efficiencies of methyl orange on two electrodes were 95.32% and 96.83%, respectively. And the cell voltage were 5.9 V and 5.6 V,respectively. After compositing CNT and Fe, the accelerated life was 2.33 h which is 1.49 times as much as that of Ti/PbO2 electrode.The pulse electrodeposition method was used to prepare Ti/PbO2 electrode and CNT-Fe modified Ti/PbO2 electrode. The SEM analysis result indicated that Ti/PbO2 electrode made in pulse frequency of 10Hz is more even and fine than Ti/PbO2 electrode by direct current electrodeposition method, which enhances the accelerated life and the catalytic property. The degradation efficiency of methyl orange is greater than those of acid orange and methylene blue after 70min processing. The degradation efficiencies of methyl orange on two electrodes were 97.38% and 98.96%, respectively. And the cell voltage were 5.4 V and 4.4 V,respectively. The accelerated lives are 3.09 h and 4.88 h, which are 1.98 and 3.13 times as much as that of Ti/PbO2 electrodes by the direct current electrodeposition. Kinetic studies showed that all the degradation processes follow the first-order kinetic law.In conclusion, the pulse electrodeposition method and CNT-Fe modification enhance the electro-catalytic property and the accelerated life, reduce the cell voltage and save the running cost. The Ti/PbO2 electrode has great value in engineering application.