The Porous Titanium Substrate PbO₂ Tubular Membrane Electrode Preparation And Application

This paper developed a new method of electrodeposition-nflation electrodeposition method, which overcame the problem of traditional electrodeposition method can’t deposited metal oxide layer on a porous substrate. This process can successfully deposited uniform thin layer of lead dioxide on the outer surface of porous titanium tubes The prepared titanium porous tubular membrane electrode with PbO2 layer equipped with the ability of filtration and electrochemical oxidation, which is better than traditional lead dioxide electrode on the aspects of electrochemical performance and service life.The porous titanium tube as anode, stainless steel ring as the cathode. Titanium porous tubular membrane electrode can be obtained under the conditions of constant temperature, continuous inflation electrodeposition of lead dioxide for 80min. Through pore size analysis and scanning electron microscopy can observe that average pore diameter is 2-3 μm, cyclic voltammetry curve analysis and accelerated life test suggested that oxygen evolution electrode potential is 1.6Vand service life is 43 hours.Acephate wastewater was used as the subject to investigate the electrochemical performance of the prepared electrode. The outcome was compared with the method of photocatalytic degradation and traditional lead dioxide electrode static degradation in the same conditions, the light photocatalytic degradation rate of 84% after 2h and the degradation rate of prepared membrane electrode can reach 100% after 1.5h. At the same time, the dynamic electrochemical degradation process of acephate also showed better performance than traditional static electrochemical degradation. Through changing a series of operating parameters such as the initial concentration of acephate wastewater, concentration of Na2SO4, pH value and current density, the experiments studied the effects of different parameters on the degradation effects. It showed that with the higher the initial concentration of wastewater, the degradation rate is much lower and when solution pH value is higher, the degradation effect is better. The electrolyte concentration is 5g/L can achieve best treatment results; With the higher current density, the higher degradation rate can be. To a certain extent, current density has smaller influence on the degradation rate.