Preparation And Characterization Of Catalytic Performance Of Composite Tin Oxide Electrode

Electrochemical advanced oxidation processes?EAOPs?has been considered as a promising approach for the treatment of refractory organic wastewater due to its high efficiency,simple equipment,ease of operation,fast reaction rate,adding no catalyst and environmental friendliness.It is investigated that the properties of anodes is the key factor in the effectiveness of electrochemical oxidation.In order to improve the catalytic efficiency and adsorption effect of SnO₂ Composite electrode,a new composite SnO₂ adsorption electrode?TSS-CAs?with good adsorption and electrochemical properties was successfully prepared by introducing carbon aerogels,and was used to degrade three isomers of dihydroxybenzenes?catechol,resorcinol,hydroquinone?.Scanning electron microscopy?SEM?and cyclic voltammentry?CV?analysis showed that the sintering conditions had a significant effect on the morphology,structure and composition distribution of TSS-CAs electrodes.under the condition of oxygen,the surface active layer and structure of the electrode prepared by sintering at 450?are more stable,and the electrocatalytic effect is remarkable.In this study,it is observed that the optimum TSS-0.5%CAs possessed prominent porous structure by SEM,and larger specific surface area of180.83 m²·g^-1 by BET analysis.Electrochemical measurements exhibited that the electrode with0.5 wt%carbon aerogels had the enhanced electrocatalytic activity,larger electroactive area,and higher oxygen evolution potential?2.2 V?,the electrochemical porosity is 0.98.Under the optimum parameters,the average catalytic efficiency of the electrode was 98.99%and the reaction rate constant is 0.0501 min^-1.The relevant operation parameters including initial contaminant concentration,pH,electrolyte concentration,current density,and optimum electrode were optimized and the best condition for Catechol,degradation was obtained as selecting TSS-CAs as anode.It is demonstrated that adding proper amount of carbon aerogel is very important for the adsorption performance and catalytic degradation performance of the electrode.Compared with hydroquinone and resorcin,the Gibbs free energy of catechol is lower,then the volumetric work required for the reaction to occur is small,the reaction is easier to occur,and the degradation time is greatly shortened.The intermediates of dihydroxybenzenes oxidation were also confirmed.