Study On Preparation Of Porous Ti/SnO₂-Sb₂O₃/PbO₂ Electrode For The Reducing Of Chloride Ions In Desulfurization Wastewater

In recent years,China has raised the level of environmental protection,which requires industrial wastewaters not to be discharged from various enterprises.Therefore,in order to ensure the normal operation of its own production,each enterprise must realize the recycling of water.At present,the commonly used method is to properly dispose of the drainage and then replenish it into the industrial water system.However,various ions are continuously enriched in the water when the water is reused,which causes various adverse effects on the operation of equipment.The amount of scale cations（such as calcium ions and magnesium ions,etc.）in water can be reduced by changing the p H of the water body and by inducing flocculation sedimentation,but there is no effective method of reducing anions（such as chloride ions）which have corrosive effects on equipment in water.Therefore,there is a need to find a way to quickly and easily reduce chloride ions in wastewater.China is a big power-consuming country,and its power demand mainly depends on coal-fired power generation.The wastewater produced by coal-fired power plants is large in volume and complex in composition,and the most difficult to treatment is the desulfurization wastewater.At present,it is difficult to remove high-concentration chloride ions in the desulfurization wastewater by traditional treatment methods.Based on the above research background,it was found in the previous experimental exploration that the porous Ti/SnO₂-Sb₂O₃/PbO₂electrode has a significant effect in removing chloride ions in wastewater by electrocatalytic oxidation technology.Therefore,this subject focuses on the electrocatalytic oxidation technology.By preparing porous Ti/SnO₂-Sb₂O₃/PbO₂electrodes with different pore sizes,the electrodes are physically and electrochemically characterized,and applied to the simulation of chlorine-containing wastewater and actual desulfurization wastewater and find the best reaction conditions.In this paper,the preparation and characterization of three porous Ti/SnO₂-Sb₂O₃/PbO₂electrodes with three pore sizes（50μm,100μm,and 150μm）are studied.Field emission scanning electron microscope analysis shows that the PbO₂particles are very compact and uniformly distributed on the electrode surface.The composition and chemical state of the porous Ti/SnO₂-Sb₂O₃/PbO₂electrode can be determined by X-ray photoelectron spectroscopy（XPS）analysis and characterization.It is concluded that the porous Ti/SnO₂-Sb₂O₃/PbO₂electrode was successfully prepared.In addition,X-ray diffraction spectroscopy（XRD）analysis revealed that there were no diffraction peaks of Ti,SnO₂and Sb₂O₃,which proved that the PbO₂coating had completely covered the porous Ti/SnO₂-Sb₂O₃electrode.By linear scanning voltammetry（LSV）curves of three porous Ti/SnO₂-Sb₂O₃/PbO₂electrodes with different pore sizes,it was found that the oxygen evolution potentials of the 150μm,100μm,and 50μm porous electrodes were 2.02 V,1.99 V and 1.96 V,respectively.A high oxygen evolution potential indicates that a reaction of oxygen formation is unlikely to occur.Through cyclic voltammetry（CV）curves of three porous Ti/SnO₂-Sb₂O₃/PbO₂electrodes with different pore sizes,the results show that the 50μm porous Ti/SnO₂-Sb₂O₃/PbO₂electrode has the highest redox peak and 150μm porous Ti/SnO₂-Sb₂O₃/PbO₂electrode has the lowest redox peak,so it can be concluded that the 150μm porous Ti/SnO₂-Sb₂O₃/PbO₂electrode has a higher oxygen evolution potential and therefore a lower oxygen evolution active site,which is helpful for electrocatalytic oxidation of removing chloride ions from wastewater.This article explores the effects of porous Ti/SnO₂-Sb₂O₃/PbO₂electrodes under different operating conditions under simulated chlorine-containing wastewater,including pore size,initial chloride ion concentration,current density,initial p H,and electrode plate spacing.The results show that when the initial concentration of Na Cl is 10 g L^-1,the current density is 125 m A cm^-2,the initial p H is 9,and the electrode plate spacing is 0.5 cm,the 150μm porous Ti/SnO₂-Sb₂O₃/PbO₂electrode has the best removal effect on the chloride ions and the removal ratio of chloride ions could reach 98.5%.This article explores the effects of different operating conditions on porous Ti/SnO₂-Sb₂O₃/PbO₂electrodes under actual desulfurization wastewater,including pore size,current density,and electrode plate spacing.The results show that when the current density is 125 m A cm^-2and the electrode plate spacing is 0.5 cm,the 150μm porous Ti/SnO₂-Sb₂O₃/PbO₂electrode has the best effect on removing chloride ions,and the removal rate of chlorine ions can reach 94.6.%.Through the exploration results in this article,it was found that porous Ti/SnO₂-Sb₂O₃/PbO₂electrodes have a good effect on the electrocatalytic oxidation of chloride ions in wastewater,and provide a practical method for removing chloride ions in wastewater.