Preparation Of Titanium Suboxide Electrode And Research On Degradation Efficiency Of Phenolic Wastewater By Three-dimensional Electrode System

In recent years,environmental pollution caused by refractory organic industrial wastewater has become more serious.Among them,phenol-containing wastewater has a wide source,large discharge and strong hazards,and needs to be controlled and efficiently treated in time.As one of industrial wastewater pretreatment and advanced treatment technologies,electrocatalytic oxidation technology has high catalytic efficiency,good treatment effect,simple process and will not cause no secondary pollution,and can efficiently treat refractory organic industrial wastewater.At present,the main factors restricting the wide application of electrocatalytic oxidation technology are electrode performance and system energy consumption.Therefore,improving electrode material performance and improving electrochemical treatment devices have become research hotspots in this field.In this paper,using phenol-containing wastewater as the target pollutant.Using titanium suboxide as the electrode material,the preparation process of titanium suboxide anode and particle electrode was optimized,and the electrode structure and electrochemical performance were characterized.On this basis,a three-dimensional electrode system was established and the processing parameters were optimized.In this paper,metal reduction method,non-metal reduction method,sol-gel method and rolling method are used to titanium suboxide anodes.SEM,EDS and XRD are used to characterize the anode prepared by different methods,and EIS,CV and other electrical chemical performance testing.The results show that the best preparation process of titanium suboxide anode is by rolling method,the mass ratio of titanium oxide to binder was 3: 1 and was not subjected to subsequent calcination.The internal resistance of this electrode is 15.2 ?,the internal resistance of charge transfer is 27.3 ?,and the electrochemical performance is good.Use the impregnation method to load the titanium suboxide material on the quartz glass ceramic ring carrier,and determines and optimizes the preparation process conditions of the ceramic ring particle electrode.The best preparation condition is a large ring with a diameter of 2 cm as a carrier,a mass ratio of titanium oxide to binder of 4:1,and sintering at 350 ? for 2 h.SEM,XRD,XPS and BET were used to characterize the surface structure of the particle electrode,and electrochemical tests were performed on the system before and after the particle electrode was filled.The results show that the active component of titanium suboxide has been successfully loaded on the ceramic ring carrier.The specific surface area of the ceramic ring particle electrode can reach 0.3376 m2/g,showing a rich pore structure with large pores and mesopores,and good circulation.The filling of the particle electrode can improve the electrochemical performance of the electrode system,so that the ohmic internal resistance and charge transfer internal resistance of the two-dimensional electrode system with titanium suboxide as the anode are reduced,and phenol direct oxidation peak appears at 0.19 V(vs.SCE).The titanium suboxide anode,stainless steel cathode and ceramic ring particle electrode are used to construct a three-dimensional electrode system,which degrades the simulated wastewater with an initial concentration of 100 mg/L phenol and optimizes important process parameters of the system.The results show that the best parameters for the degradation of phenol in the three-dimensional electrode system are cell voltage 12 V,electrode spacing 50 mm,particle electrode filling mass 55 g,and p H 3.0.After 3 hours of reaction,the phenol degradation rate of the three-dimensional electrode system reached 92.22%,the COD removal rate reached 94.26%,and the energy consumption was only 39.68 k Wh/t.Compared with the two-dimensional electrode system,phenol degradation rate and COD removal rate increased by 39.06% and 51.74%,energy consumption is reduced by 46.57 k Wh/t.Finally,the experimental parameters and CFD simulation are used to design a three-dimensional electrode reactor for pretreatment of certain gas washing water.The treatment cost is 2.614 yuan/ton,which has practical application value.