The Study On The Degradation Of Simulated Textile Wastewaters By Anodic Oxidation Using A PbO₂ Anode Modified With Neodymium And By Electro-Fenton Process Using Activated Carbon Fiber Cathode

Electro-catalytic oxidation technology is an efficient degradation of dye wastewater treatment technology. The experimental study was carried on the degradation of simulated dye wastewater by anodic oxidation using Nd modified PbO2 anode and electro-Fenton process treatment using activated carbon fiber cathode and proposed a possiable degradation mechanism.The result of anodic oxidation degradation of RB49 by using Nd modified PbO2 anodes shows that:the doping of Nd enhances electro-catalytic performance and stability of the PbO2 layer. Based on XRD and SEM analysis, the main component of the electrode surface is still β-PbO2, the existence of Nd is Nd2O3. With the increase of Nd content the crystallinity and roughness on the surface of PbO2 layer increased.In addition, the COD reduction, the current efficiency and electrode stability were investigated by the anodic oxidation experiments at a certain current density (30mA/cm2) and initial concentration of pollutants (100mg/L). The COD results show that the performance of electrocatalytic activity increased with the increase of Nd doped, and optimum theoretical molar ratio of the Nd/Pb is 5%. And the improved Nd-doped PbO2 electrodes life and stability are probably related with more oxygen vacancies caused by the doping of the Nd into the PbO2 layer, thereby improving the electrocatalytic performance and electrode stability. Moreover, the effect of the concentration of Fe2+, pH, initial concentration of dye and current density for the removal of total organic carbon (TOC) by electro-Fenton degradation of RB49 was examined. The result shows that when pH 3.0, the initial concentration 100 mg/L, the concentration of Fe2+ 0.5 mmol/L and current density 3mA/cm2, the removal of TOC values reaches 90% after 6h, indicating the electro-Fenton degradation of RB49 simulated wastewater is significantly effective.Additionally, based on the major aromatic intermediates identified by GC-MS spectrometry, including salicylaldehyde, salicylic acid and 2-nitrosobenzaldehyde, etc., a possible degradation pathway of RB49 is proposed.