The Prepared,Modification And Electrocatalysis Degradation Methylene Blue Of Ti/TiO₂NTs/PbO₂ Electrode

TiO2 is a good semiconductor,and it is known for its excellent chemical stability,high oxidation reduction,no secondary pollution and good selectivity.Ti02NTs because of its high specific surface area and unique size effect,take ours great interest.We can take TiO2NTs these characteristics putting them as a template,and modify some catalysts in the TiO2NTs tube or its surface,prepared electrode materials of nanometer size,in order to enhance the electrochemical properties of the electrode.Based on the Ti/TiO2NTs electrode,and modified it,in order to improve its catalytic performance.Using pulse electrodeposition take Pr element doping of TiO2NTs.The preparation of a new type of electrode material of Ti/TiO2NTs/PbO2-Pr.Tested by cyclic voltammograms(CV),linear voltammetry(LSV)and other means to evaluate the performance of the electrode,the results show that the new electrode materials of Ti/TiO2NTs/PbO2-Pr has high catalytic activity.The result of scanning electron microscope(SEM),X-ray diffraction(XRD)and X-ray photoelectron spectroscopy(XPS)indicate the electrode surface morphology,crystalline structure and element composition.And we try to using the sol-gel prepared of titanium dioxide nanoparticles contained CeO2(TiO2nano-CeO2),and characterized its performance.The main research results were as follows:1.Under the optimized conditions,with nitric acid praseodymium(Pr(NO3)3 ·6H2O)for the sources of rare earth doped,successfully took the Pr element doped in Ti/TiO2NTs/PbO2 electrode.The results showed that:from the CV figure in 0.1 mol/L sodium sulfate solution,Ti/TiO2NTs/PbO2-Pr electrode had higher oxygen evolution potential.From SEM figure,we can found that the grain more smaller and the specific surface area more bigger.By XRD analysis,TiO2 peak intensity were decreases after the doping of PbO2-Pr,the reason was probably some PbO2-Pr coverage to the Ti/TiO2NTs surface caused TiO2 can't detected.The XPS figure shows that the doping of rare earth elements(Pr)in the form of three price in Ti/TiO2NTs/PbO2-Pr electrode.Electrocataly experiments proved that the Ti/TiO2NTs/PbO2-Pr electrode was prepared have good catalytic ability and stability.2.Peppered titanium dioxide nanoparticles with doped of cerium dioxide by sol-gel under the optimized conditions.And take the nanoTiO2/CeO2 modification to TiO2NTs internal or surface,through SEM,XRD,XPS characterization methods to explore its(Ti/TiO2NTs/PbO2-TiO2nano/CeO2)morphology,crystal structure and the elemental composition.Tested by cyclic voltammograms(CV)and electrochemical impedance spectroscopy(EIS)to evaluate performance of the Ti/TiO2NTs/PbO2-TiO2nano/CeO2 electrode.The result shows that the Ti/TiO2NTs/PbO2-TiO2nano/CeO2 electrode had a larger specific surface area,high oxygen potential and low impedance.3.Using the Ti/TiO2NTs/PbO2-Pr electrode,studies the characteristics of the Ti/TiO2NTs/PbO2-Pr electrode catalytic degradation of methylene blue.The result shows that the Ti/TiO2NTs/PbO2-Pr electrode peak current density in the methylene blue organic solution of 50 mA/cm.And electrolysis after 120 min,the removal rate of Ti/TiO2NTs/PbO2-Pr electrode reached 99.7%and COD removal rate was 88.0%,and Ti/TiO2NTs/PbO2 electrode was only 84.9%and 55.1%.