The Preparation Of Particle Electrode And Its Three-dimensional Photoelectrocatalytic Oxidation Of PAM And P-NPh

Three-dimensional photoelectrocatalytic oxidation is a kind of environmental friendly technology,degrading pollutant under the synergistic effect of photocatalysis and electrocatalysis.It consists with particle electrode as the third pole of the reactor on the basis of two-dimensional.Pollution is degradated under photoelectrocatalytic system through loading the material of photoelectrocatalytic performance on the surface of particles or anode.Compared a separate electric catalytic system,it has the stronger ability to deal with contaminants and no secondary pollution.With the shale gas mining,oil wastewater containing polyacrylamide(PAM)and its derivatives after its use repeatedly is bigger and more difficult to deal with.The petroleum and chemical processing,oil refining and other industrial produced a large number of phenol wastewater with high concentration and high biological toxicity.Their treatment processes are complicated and costly.For human health and social development,the treatment of refractory wastewater using high efficient and green methods of is of great significance.In this paper,the active carbon was used as particle electrode,loading with good optical catalytic metal oxide.And the three-dimensional photoelectrocatalysis device was used to degradate PAM simulated wastewater for comparing the electric catalytic and photoelectric effect of Ti/AC,Zn/AC,Sn/AC,TiZn/AC,TiSn/AC,ZnSn/AC,TiZnSn/AC particle electrode.Under the photoelectric system,the treatment effect of TiZnSn/AC particle was higher.The preparation conditions of TiZnSn/AC particle electrode were optimized,and the result was that n(ZnSn):n(Ti)= 3:7,n(Zn):n(Sn)= 4:1,calcination temperature 500?.SEM,EDS XRD and XPS were used to analyze the characterization of particle morphology and structure.The electrochemical workstation was used to analyze the electrochemical properties of AC,Ti/AC,and TiZnSn/AC.The CV curve showed TiZnSn/AC particles with greater voltammetric charge,electric catalytic activity.The polarization curve showed that the oxygen evolution overpotential were 0.62,0.87,0.96V.And TiZnSn/AC particles have higher oxygen potential and higher electric catalytic activity.The electrochemical impendance diagram showed that TiZnSn/AC particles resistance was smaller,and electrical conductivity was better.The particle of TiZnSn/AC was used to degradate PAM and p-NPh simulated wastewater under photoelectricity system.The single factor and response surface method were used to optimize the PAM simulated wastewater treatment process,analyzing the energy consumption on electrochemical system,getting the best treatment conditions that pulse frequency of 2400 Hz,the duty ratio of 0.5,the particle added amount of 33 g/L,pH = 3,current density of 17 mA/cm2.By ultraviolet-visible absorption spectra and GC-MS analysis showed that the polyacrylamide was mainly degradated to linear fracture carboxylic acids and short chain alkane,further degradation of small molecules,eventually reduced to inorganic.The TiZnSn/AC particles were used to treat nitrophenol simulation wastewater,exploring the treatment effect and its degradation dynamics equation in different particles added amount,different initial concentration of p-NPh,under different pH and current density.The degradation process of p-NPh was explored by the COD and ultraviolet-visible absorption spectra.Under the role of the free radicals and other reactive groups,p-NPh was oxidized gradually into small molecules until they are all degraded.