| In this paper,Zr doped IrO2 electrodes were prepared by thermal decomposition method.Through a series of physical and chemical characterization,we found that Ti/SnO2-Sb/Zr0.3Ir0.7O2 electrode has good electrocatalytic characteristics:1)Low onset potential,the overpotential is only 0.329V when the current density is 10 mA·cm-2,the Tafel slope is 65.00 mV·dec-1,ECSA is up to 350cm2,the mass activity per unit Ir is 1.8 times that of IrO2.These excellent OER properties enable the electrode to produce active intermediates at lower voltages,which can degrade organic pollutants and reduce energy consumption.Larger electroactive surface area can improve the contact between active substances and pollutant molecules,then improve the degradation effect of pollutants.2)Doping Zr into IrO2 reduces the content of Ir and increases the possibility of its actual degradation application.3)In the accelerated life test,the life of electrode is up to 800h,with good stability.Based on these good characteristics,we applied Ti-f/SnO2-Sb/Zr0.3Ir0.7O2 to the degradation of different types of organic pollutants.The main research work is as follows:(1)When degrading PPCPs wastewater simulated by sulfamethoxazole,we found that our system can degrade sulfamethoxazole efficiently in a large range of factors.Under the optimal conditions,sulfamethoxazole can be completely degraded in 3 hours.At the same time,the energy consumption is low,EE/O is only 8.50 kwhm-3 at 4V constant pressure degradation.(2)When degrading dye wastewater simulated by Congo red,we found that different factors of our ystem have a great impact on the degradation of Congo red,but can basically degrade Congo red in 4 hours,while the removal of IrO2 electrode is 89%.The removal of Congo red can be increased from 59%to 98%in 4h by using titanium foam as matrix,mainly due to the action of three-dimensional porous structure.At the same time,the energy consumption is low,EE/O is only 13.51 kwhm-3 at 4V constant pressure degradation. |
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