Preparation Of Graphene And Eu Doped Ti/SnO₂-Sb Electrode And Study On Its Electrocatalytic Degradation Of Clothianidin Wastewater

The use of pesticides in China has shown a rapid rising trend in recent years.In addition,The use and intensity of pesticides vary greatly in different areas because of the vast territory of our country.Problems such as pesticide poisoning,food safety and environmental pollution caused by pesticide residues affect human health and ecological environment to varying degrees.Clothianidin pesticide has a broad market prospect due to its high performance effect.However,there is no specific use and testing standard for the use of the pesticide in China at present,which may cause the abuses of tiamines to cause environmental pollution.In this paper,the electrodes doped with grapheme and rare earth Eu are introduced into the electrocatalytic degradation system.We explored the optimum preparation parameters of the modified electrode and optimized the degradation conditions.Various conditions for the degradation process of clothianidin were analyzed and optimized.The degradation mechanism and pathway were explored,which can enrich the theoretical knowledge of electrocatalytic treatment of wastewater and provide some theoretical support and technical guidance for the actual degradation of thiamidate in water.Preparation of modified electrodes for doped graphene and rare earth Eu by Pechini method.The calcination temperature and the doping ratio of graphene and rare earth were optimized.Finally,the best preparation process of the modified electrode was determined as follows:calcination temperature 600?,graphene doping ratio 0.015wt.%,rare earth Eu doping ratio 0.05wt.%.Scanning electron microscopy(SEM),X ray diffraction(XRD),oxygen evolution potential(LSV)and cyclic voltammetry(CV)were used to characterize the surface morphology,crystal morphology and electrochemical properties of the electrode.The factors such as initial pH,electrolyte concentration,current density and initial clothianidin concentration were investigated in the degradation experiment of clothianidin simulated wastewater.The optimal experimental conditions:initial pH=5,current density 20mA/cm2,electrolyte concentration 0.3mol/L,initial concentration 75mg/L.The intermediates in the degradation process of clothianidin were analyzed by mass spectrometry,and the samples with degradation time of Omin(original),60min and 120min were analyzed by mass spectrometry.The possible degradation pathways and degradation mechanism were deduced:·OH was the main factor of the degradation of clothianidin,and the main reaction during the degradation was the C-N bond between N-N bond and nitro guanidine and thiazole ring.