The Modification Of Lead Dioxide And Its Electriccatalytic Application Research

With the advantages of low price, good chemical stability, higher oxygen evolution potential and good electric catalytic activity, lead dioxide electrode is considered to be the best anode material in the future. In order to further improve the service life and electric catalytic activity of lead dioxide electrode, in this article, through changing the structure and doping metal elements to improve the performance of lead dioxide, specific work is as follows:Co doped Ti/TiO2 nanotube/PbO2 (Co-PbO2/TiO2-NTs/Ti) was prepared by the pulse electrodeposition technique for methylene blue (MB) degradation.The Co-PbO2/TiO2-NTs/Ti (P) electrode was characterized by SEM, XPS and XRD. The results indicated that Co-PbO2/TiO2-NTs/Ti (P)prepared by pulse electrodeposition technique possess more compact structure and finer grain size than Co-PbO2/TiO2-NTs/Ti (D) electrodes prepared by direct electrodeposition.The size of the nanoparticl of Co-PbO2/TiO2-NTs/Ti (P) is 10.62nm, while the size of the nanoparticles of Co-PbO2/TiO2-NTs/Ti (D) is 23.15nm. The electrochemical properties of electrodes were studied by steady-state polarization curves, cyclic voltammetry (CV) and eletrochemical impendence spectroscopy (EIS), results showed that the Co-PbO2/TiO2-NTs/Ti (P) electrode has higher oxygen evolution potential and electric catalytic activity. The oxygen evolution potential of Co-PbO2/TiO2-NTs/Ti (P) is 1.75V, whicle the Co-PbO2/TiO2-NTs/Ti (D) is 1.60V. The bulk electrolysis showed that the methylene blue (MB) and chemical oxygen demand (COD) removal efficiency of Co-PbO2/TiO2-NTs/Ti (P) reach 100% and74.0% respectively after 120 min. Co-PbO2/TiO2-NTs/Ti(P) electrode has a longer service life than others.Through the pulse electrodeposition (PED), a novel rare-earth yttrium modified PbO2 electrodeposited into TiO2 nanotube arrays (Y2O3-PbO2/TiO2-NTs/Ti) was successfully fabricated.After the analysis of SEM, XRD, XPS, the results show that yttrium oxide and lead dioxide deposition in the titanium dioxide nanotubes, while the nozzle is not blocked. The CV, EIS test of Y2O3-PbO2/TiO2-NTs/Ti electrode showed that when the deposition time is 45 min, electric catalytic properties of the electrode is best. Accelerating experiment shows that the service life of Y203-Pb02/Ti02-NTs/Ti (P-45min) life is 627 h, compared with Y203-Pb02/Ti02-NTs/Ti (D-45min) (509 h) got obvious improvemen. The MB removal efficiency and the TOC removal efficiencies of Y203-Pb02/Ti02-NTs/Ti (P-45min) reach 100% and 79% after 2 h electrolysis, respectively. Through the experiment of electrical catalytic degradation of methylene blue to study the influence of the initial concentration, current density and pH value of Y203-Pb02/Ti02-NTs/Ti (P-45 min) on the degradation of methylene blue, the experimental results show that when the initial concentration is 30 mg/L, the current density is 60 m A.cm-2 and the pH is 3, the Y203-Pb02/Ti02-NTs/Ti(P-45min) electrode has the highest catalytic activity.