Preparation Of A New Modified Titanium Based Lead Dioxide Electrode And Its Application In Dye Wastewater Treatment

As a green and efficient technology of wastewater treatment,electrocatalytic oxidation obtained many research and attention of scientific research workers in recent years.The traditional titanium-based lead dioxide electrode has good electrocatalytic performance,but the lead dioxide easily fall off from the matrix,and make the electrode exists some disadvantages in the stability,catalytic and service life.Therefore,it is necessary to modify the titanium-based lead dioxide(PbO2)electrode to further optimize and improve the electrochemical performance,so that it can be better applied in wastewater treatment.This paper focused on the preparation,characterization and application of cerium(Ce)and neodymium(Nd)co-doped PbO2 electrode,i.e.Ti/SnO2-Sb2O3/α-PbO2/Ce-Nd-β-PbO2.The doped lead dioxide electrode was prepared by electrodeposition.The electrochemical activities of the modified electrode were investigated and compared with Ce-PbO2,Nd-PbO2 and pure PbO2 electrodes.Scanning electron microscopy(SEM),energy-dispersive X-ray spectroscopy(EDS),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS)were used to characterize the surface morphology,crystal structure and elemental states of the modified electrode.The Ce and Nd co-doped PbO2 electrode had smaller crystal particles,more compact structure and higher activity of electrocatalysis compared with the single doped and undoped PbO2 electrodes.Linear-sweep voltammetry(LSV)and electrochemical impedance spectroscopy(EIS)were also utilized to study the electrochemical response of the modified electrodes.The results show that the prepared Ce-Nd-PbO2 electrode has the highest O2 evolution potential(OEP)and lowest charge transfer resistance,the OEP is 2.17V,suggesting that it has the lower energy consumption than other three kinds of electrodes.Electrochemical oxidation methyl orange(MO)as a model dye wastewater was studied to evaluate the potential applications of this modified electrode in environmental science.It was found that the Ce-Nd-PbO2 electrode exhibited higher MO and chemical oxygen demand(COD)removal efficiency than single doped and pure PbO2 electrodes,close to 100%.Therefore,the modified lead dioxide electrode has more efficient electrocatalytic oxidation activity.