Abstract:

We  prepared Ti/PbO₂, Ti/F-PbO₂ and Ti/F-La-PbO₂ electrodes with thermal decompositionplating method and analyzed the surface morphology and phase of Ti/PbO₂, Ti/F-PbO₂ and Ti/F-La-PbO₂ electrodes with SEM and XRD. With the experiment of accelerating electrolytic life and oxidizing nitrobenzene in wastewater, we researched the influences of stability and electric catalytic activity of PbO₂ electrodes with Fdoping and F^-  and  La³⁺ co-doping. SEM and XRD were used to analyze the surface structure and crystal type of Fe³⁺/MgO. The catalyst was added in the electric catalytic oxi
dation system to test  the influence of the relevant factors on degradation  of COD and NB in the wastewater. The experimental results show that compared with undoped Ti/PbO₂ electrode, the incorporation of La³⁺ made the electrode coating surface grain refinement. Different doping  produces certain effects on growth  orientation of crystal. Fdoping significantly raised electrolytic life of PbO₂ anode. La³⁺doping improved the conductive performance. Compared with those of Ti/PbO₂, Ti/FPbO₂ electrode, electrical catalytic degradation activity of the Ti/F-La-PbO₂ electrode increased significantly. In the electrolytic system, the  catalyst added significantly improved the electrolytic reaction rate, COD and nitrobenzene degradations. The degradation of nitrobenzene fit the pseudofirstorder reaction kinetics in the amount of the catalyst.

Key words:  nitrobenzene, catalyst, electrolytic, catalytic oxidation