Preparation Of Hydrophobic Lead Dioxide Electrodes For The Degradation Of Phenolic Wastewater

The electro-oxidation processes has been developed to date,there are three challenges in the way.First,the development of the electro-oxidation processes lacks electrodes with high activity selectivity and stability;Second,it is necessary to complete the mechanism of organic pollutants electro-oxidation.Third,the electro-oxidation processes have not been popularized in industrial applications.The ?-PbO₂ of a Ti/Sn-SbO_x/PbO₂ electrode was modified with polydimethylsiloxane?PDMS??Ti/Sn-SbO_x/PbO₂-PDMS?through a facile electrodeposition method.The results from scanning electron microscopy,energy-dispersive spectrometry and X-ray diffraction demonstrated that the PDMS was irreversibly adsorbed on the?-PbO₂ of Ti/Sn-SbO_x/PbO₂-PDMS,leading to a decrease in the crystal size,surface cracks and preferential growth trend of?-PbO₂.Compared with its PDMS-unmodified counterparts,the Ti/Sn-SbO_x/PbO₂-PDMS electrode exhibited relatively higher activity,selectivity and stability in the anodic oxidation of p-chlorophenol.Moreover,the Ti/Sn-SbO_x/PbO₂-PDMS electrode was more stable than the Ti/Sn-SbO_x/PbO₂ electrode,as evidenced by the accelerated life test.Based on the quantitative measurements of contact angle,hydroxyl radicals?HO·?and the initial surface concentration of various p-substituted phenols,including p-cresol,p-methoxyphenol,phenol,and p-chlorophenol,and with the help of electrochemical characterization of linear sweep voltammetry,it could be concluded that the improved electrochemical activity and stability of Ti/Sn-SbO_x/PbO₂-PDMS originated from the enhanced hydrophobicity of the electrode surface.Different from a traditional Ti/Sn-SbO_x/PbO₂ electrode withadsorbed·OH as the dominant active species,the Ti/Sn-SbO_x/PbO₂-PDMS with a hydrophobic surface favors the generation of more free·OH.According to the water treatment requirements of a chemical plant wastewater treatment project,a simple electro-oxidation process was designed.The electrocatalytic reactor is amplified by laboratory reactor,and its configuration is optimized based on the mass transfer kinetics of fluid flow within the reactor.According to the volume load of·OH,a new electrocatalytic reactor volume algorithm is proposed.The specific parameters of the electrocatalytic reactor and internal configurations are calculated,and showed in the design drawing.The theoretical energy consumption of the equipment is also estimated.