Preparation Of Ti/Ru-Ir Electrode And Its Application To Degradation Of Benzene Wastewater

With the rapid development of industry,a large number of benzene wastewater has been produced,which containing a wide range of sources and type is inflammable and toxic.If it is discharged directly without treatment,it will seriously affect human health and even endanger lives.Therefore,how to quickly,efficiently and greenly treat benzene waste water is urgent.Electrocatalytic oxidation(ECO)technology can effectively degrade benzene series wastewater by direct or indirect reaction on the surface of anode electrode through the action of electric field.Compared with traditional treatment technology,this technology has the advantages of simple operation,small occupation area,low cost,green and efficient,and no secondary pollution.Therefore,in order to achieve effective degradation of benzene series wastewater in industrial wastewater,Ti/Ru-Ir electrode was used for electrooxidation degradation of benzene series wastewater.Aiming at the characteristics of benzene series wastewater in industrial wastewater that are difficult to degrade,Ti/Ru-Ir electrode was successfully prepared by thermal decomposition method in this paper,which was used to degrade three typical benzene series simulated wastewater.The suitable calcination temperature was determined by thermogravimetric differential scanning calorimetry,and the electrochemical performance of the electrode was analyzed by cyclic voltammetry(CV)and AC impedance(EIS).The results show that the prepared electrode has a voltammetric charge of 185C,an electrochemical relative active surface area of 82.29,an oxygen evolution potential of 1.40V,and good electrical conductivity.At the same time,ECO technology was used to treat the simulated wastewater of benzene series(represented by phenol,aniline and toluene).The influence factors and energy consumption of ECO electrode in the treatment of simulated wastewater of benzene series were investigated.The results exhibited excellent electrochemical performance and significant treatment effect for benzene series simulated wastewater.Firstly,this paper studies the application of Ti/Ru-Ir electrode in the treatment of acidic phenol simulated wastewater was studied,and the influence of the initial concentration of phenol,the concentration of chloride ions,and the current density on the treatment effect was systematically investigated in this paper.The research results show that the increase in the initial concentration of phenol,chloride ion concentration,and current density is beneficial to improve the degradation of phenol.Taking into account energy consumption and other factors,the optimal treatment conditions are obtained:the initial concentration of phenol is 200ppm,the initial concentration of Cl~-is 800ppm,and the removal rate of phenol reached 85.7%at120min at the current density of 30m A/cm~2.In addition,the effect of p H on the degradation of phenol was investigated,and it was found that the degradation rate can reach 83.9%after30 minutes when p H=3.This is because the ionization of phenol is inhibited under acidic conditions,preventing the oxidation of phenol to the more difficult-to-degrade quinones intermediate,which is conducive to further degradation of phenol.Under alkaline conditions,phenol is prone to produce benzoquinone intermediates,which leads to a decrease in the degradation rate of phenol.Secondly,the application of Ti/Ru-Ir electrode in the treatment of alkaline aniline simulated wastewater was studied,and the influence of current density,electrolyte concentration and initial concentration of aniline on the degradation effect were investigated in this paper.The results show that,unlike phenol degradation,aniline has the best degradation effect at p H=9.The main reason is that alkaline conditions are conducive to the generation of hydroxyl radicals,which is conducive to the degradation of aniline.Finally,the application of Ti/Ru-Ir electrodes in the treatment of neutral toluene simulated wastewater and the influence of different factors,focusing on the effect of p H was investigated.The results show that overall acidic conditions are more conducive to the degradation of toluene simulated wastewater.This is due to that H~+can inhibit the decomposition of hydroxyl radicals and the occurrence of side reactions of oxygen evolution,thereby improving the degradability of pollutants and current efficiency under acidic conditions.