Efficient Electro-Catalytic Oxidation Ultra-High Concentration Organic Dye with Ce Doped Titanium-Based Composite Electrode

Removing high-concentration organic dye from wastewater is of great concern because the hazards can cause serious damage to the environment and human health. In this study, the hybrid dimensionally stable anode (DSA) with Ce-doped and SnO2- Sb2O5 intermediate layer was fabricated and used for the electro-catalytic oxidation of three kinds ultra-high concentration organic dyes.Scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) confirmed the more dense surface structure and morphology of the composite Ti/SnO2-Sb2O5/Ce-PbO2 electrode, Moreover, the electrode exhibited excellent oxygen evolution potential of 1.58 V. The effect on the removal efficiencies of high concentrations up to 1 g/L of methyl orange, methylene blue, and neutral red solutions with the above composite electrode were investigated.The research results illustrated that target molecules in the three different dye solutions were rapidly decolorized and decomposed by electro-catalytic oxidation less than 35 min. Additionally, the degradation process still followed pseudo-first-order kinetics for high concentrations dye solution. The removal efficiency of TOC and COD for the three dye solutions was more than 98%, and the results of the GC-MS analysis showed that it had the best degradation effects for neutral red, which decomposed more thoroughly. More than 80 h of accelerated life also revealed excellent performance of the composite electrode in face of high-concentration dye solution degradation. Considering these results, the Ti/SnO2-Sb2O5/Ce-PbO2 anode could be utilized to treat wastewater containing high-concentration dyes with high efficiency.