Preparation,Characterization Of Porous Titanium Anode And Its Application In Simulated Wastewater Treatment

Titanium anode has currently become research hotspot at home and abroad,because it is the key material for the application of Electrocatalytic Oxidation Technology.This artical focused on the structure of matrix material,aimed at fabricating a novel SnO2-based anode with high electrocatalytic activity and service life.By using the hydrothermal synthesis method,a layer of TiO2-NW/PTi material composed of TiO2 nanowires was formed on the surface of PTi,and the surface area of the titanium matrix was improved.In order to improve the bonding strength between the substrate and the oxide coating,while satisfying the PTi has certain mechanical strength requirements,the optimum etching condition is the microboil etching of 30min in 10%oxalic acid solution.This paper focused on fabricated SnO2-Sb/PTi anode,SnO2-Sb/DTi anode and SnO2-Sb/TiO2-NW/PTi anode by thermal decomposition method with DTi,PTi and TiO2-NW/PTi as the matrix respectively.From the surface morphology analysis,the surface morphology of the porous SnO2-Sb/TiO2/Ti is completely different from the porous SnO2-Sb/Ti and SnO2-Sb/DTi anode.The surface of the anodic coating is mainly composed of nanoparticles and nanowires,which greatly increases the active area of the titanium anode.Meanwhile,it can also contributes to the segregation of SnO2 on the anode surface and the degree of crystallinity of the oxide,thus increasing the number of active centers on the surface of the coating,and improving the catalytic efficiency of the anode.The electrochemical properties of porous SnO2-Sb/Ti anode,SnO2-Sb/DTi anode and SnO2-Sb/TiO2-NW/PTi anode were compared,and LSV test shows that the oxygen evolution potential of the porous SnO2-Sb/Ti anode,the SnO2-Sb/DTi anode and the SnO2-Sb/TiO2-NW/PTi anode are 2.06V,1.94V and 2.15V respectively.The accelerated life test showed that the SnO2-Sb/TiO2-NW/PTi anode had a higher enhanced electrolysis life and reached 38.5h.The effects of SnO2-Sb/TiO2-NW/PTi anode on removal efficiency of methyl orange simulated wastewater under different current density,electrolyte concentration and initial methyl orange concentration were investigated.At the optimal parameter conditions of current density(40mA/cm2),electrolyte concentration(10g/L)and initial concentration(100mg/L),the removal rate of 2h in methyl orange wastewater treatment reached 92.9%.The effect of electrocatalytic oxidation of SnO2-Sb/DTi anode,SnO2-Sb/PTi anode and SnO2-Sb/TiO2-NW/PTi anode for the degradation of methyl orange wastewater was compared.The results show that the SnO2-Sb/TiO2-NW/PTi anode has an obvious treatment effect on the simulated wastewater of methyl orange,and the decolorization rate reached 93.2%.However,the decolorization rate of SnO2-Sb/DTi anode and SnO2-Sb/PTi anode for methyl orange wastewater is only 53.4%and 70.1%respectively.The removal rate of SnO2-Sb/TiO2-NW/PTi anode to methyl orange COD reached 90.6%,while the SnO2-Sb/DTi anode and SnO2-Sb/PTi anode were 51.6%and 71.2%respectively.The degradation rate constant k of methyl orange degradation catalyzed by three titanium anodes was compared:SnO2-Sb/TiO2-NW/PTi anode(2.01×10-2min-1)?SnO2-Sb/PTi anode(1.15×10-2min-1)?SnO2-Sb/DTi anode(0.67×10-2 min-1).Compared the above data,SnO2-Sb/TiO2-NW/PTi anode has higher electrocatalytic activity and electrochemical stability,which is a new type of anode material with wide application prospects.