Electrochemical Decolorizaton of Dye in Solution with Modified Ti/α-PbO2/β-PbO2 Mesh Electrode

Abstract

The synthetic dyes with high stable aromatic structures severely impair watery environments, due to their low biodegradability and deep color-staining. Furthermore, dye pollution would inhibit aquatic plants’ photosynthsis process, decrease the concentration of dissolved oxygen, and contain substances that are toxic to the human body.The electrochemical oxidation is an attractive advanced wastewater oxidation process, which has been applied in toxic or refractory wastewater treatment, owing to its simplicity, easy operation, environmental compatibility, mild condition and high efficiency. Their degradation performance depends strongly on the selected anode materials. Thus, it is necessary to develop excellent anode materials with high stability and electrocatalytic activity.Recently, various anode materials have been fabricated and studied. PbO2 electrodes could be regarded as important metal oxide anodes for pollutant remediation, because of their high chemical stability, easy preparation, high oxygen evolution overpotential, good conductivity, high catalytic activity, cheap and available. However, PbO2 film can peel off easily for its relatively large internal stress. The phenomena cause the leakage of Pb ions and releasing into the solution. Therefore, the improvements of stability and electrocatalytic performance for PbO2 electrodes are significant for the application. Recently, many studies have been investigated for the enhancement of electrode performance, such as the modification of substrate, the introduction of interlayers and the doping of metal ions or particles [1-3].In the previous study, the electrochemical decolorizaton of Methylene blue in solution with Ti/α-PbO2/β-PbO2 Sheet electrode has been investigate. In the present work, Ti/α-PbO2/β-PbO2 Mesh electrode was modifeid by the doping of metal, and have been applied into the electrochemical remediation of Methylene blue in the solution.