Study On The Preparation And Application On Electro-Chemical Oxidation Of Phenol By Modified Titanium Base Lead Dioxide Electrode

Phenol is an important raw material for chemical synthesis,which are finding there an advanced field of application.Phenol has high bio-toxicity and carcinogenicity,and the treatment of phenol wastewater is continuously optimized and developed.Electrocatalytic oxidation technology is widely used due to its advantages of simple operation,automation and environmental compatibility.Titanium-based lead dioxide?Ti/PbO₂?electrodes are widely used in various industrial production.This thesis is based on the research achievements of domestic and foreign scholars on the improvement of preparation methods and doping modification,dealing with the modification,preparation and application on electrochemical oxidation of Phenol to improve the service life and catalytic performanceIn this paper,carbon nanotubes were covalently modified with strong acid,modified by Nafion on titanium substrate by coating method,and direct current electrodeposition was used to modify electrode with?-PbO₂ active coating.The preparation process analysis showed that the thickness quality of each component layer was well controlled,and it was determined that the performance of the electrode coated with 5 layers of polyester film was the best.FTIR spectroscopy analysis showed that oxygen-containing functional group such as carboxyl or hydroxyl groups were effectively introduced into the surface of the carbon nanotube tube walls after the mixed acid treatment.Surface morphology analysis of multi-walled carbon nanotubes and lead dioxide electrodes pre-and post modification were analyzed by OM,SEM.The results showed that The surface of the modified electrode is compact and smooth,with increased mechanical strength and reaction area.The statistical results of the size distribution showed that the surface pore size was nanometer.At the end of electrodeposition,the modified electrode voltage was 1.6 V,and the conventional electrode was 2.4 V.The conductivity of the electrode was significantly enhanced.Accelerated electrode life test showed that the life of the modified electrode was 73.1 h,which was 1.98 times that of the conventional electrode.Through the electro-reduction cycle test,there was no significant decrease in the performance of the electrode after repeated use for 20 times,indicating that the electrode has good stability and reusability.The self-made modified Ti/PbO₂ electrode was used as the anode and the graphite plate was used as the cathode to study the degradation of simulated phenol wastewater.In the experiment,the effects of current intensity,electrolyte concentration,pH,plate spacing,electrolysis time,stirring rate and temperature on the electrocatalytic oxidation of phenol by modified electrode were investigated.The kinetic analysis and energy consumption analysis were carried out.It was found that the electrochemical degradation of the modified electrode was better?The removal rate of phenol was over 99%.The phenol removal rate increases with the increase of current intensity,electrolyte concentration,reaction time,stirring rate and temperature.In the range investigated,the positive effect of current intensity and time plays a leading role;There was a significant effect of pH and the spacing plateon on the removal rate of phenol,but both have an optimum value.The results of kinetic analysis showed that the electrochemical degradation process of phenol was different in different reaction stages and generally followed the pseudo-first order kinetics.Two paths of indirect oxidation of phenol were discussed.In addition,the cost analysis results showed that the electrode has good practical economics.