The Preparation Of F-SnO₂/GAC Particle Electrode And Its Electrocatalytic Performance

As an important mark of three-dimensional electrode different from two-dimensional electrode,particle electrode has always been the research hotspot of three-dimensional electrode method.With the development of three-dimensional electrode electrocatalytic oxidation technology,more and more researchers turn their attention to the research of particle electrode materials in recent years.The research and development of high catalytic activity,good conductivity,strong adsorption and high stability particle electrode materials is the development direction of electrocatalytic oxidation technology.In this paper,F^-doped F-SnO₂/GAC particle electrode was prepared by sol-gel method using granular activated carbon?GAC?as the carrier.The particle electrode was characterized by SEM,EDS,XRD,XPS and CV.The results show that the F-SnO₂/GAC particle electrode with the content of n_F:n_Sn=1:10,calcined at 500?for 2 hours,has the best electrocatalytic activity.In this paper,the degradation efficiency of F-SnO₂/GAC particle electrode for different azo dyes?anionic dye:reactive brilliant red X-3B;cationic dye:rhodamine B?was studied,and the operation conditions of the three-dimensional electrode reactor were optimized.The experimental results show that the three-dimensional electrode system has good treatment effect on the simulated anionic and anionic dyes.When the p H of the system is 3,the cell voltage is 9V,the concentration of electrolyte Na₂SO₄is0.1mol/L,and the amount of particle electrode is 30g,the three-dimensional electrode reactor has the best degradation effect on wastewater containing nitrogen dyes.The decolorization rates of reactive brilliant red X-3B and Rhodamine B were 98.5%and96%respectively,and the removal rates of cod were 68.7%and 75.2%respectively.In this paper,the feasibility of continuous flow three-dimensional electrode reactor filled with F-SnO₂/GAC particles to treat the actual wastewater produced in the process of seed coating agent manufacturing in a company in Tianjin is further verified.The effect of different HRT on COD removal of seed coating wastewater was analyzed.The results show that the continuous flow three-dimensional electrode reactor has the best treatment effect and the lowest energy consumption when the hydraulic retention time is 10 min in the continuous 100 min electrolysis experiment.It is revealed by ESR that the three-dimensional electrode system can remove pollutants mainly by indirect oxidation of hydroxyl radicals?·OH?.