| It is predicted that the world population will reach 9.1 billion in 2050.Therefore,the problems related to environmental pollution and water pollution have become the main challenges in today’s world.In the context of environmental,social and economic sustainable development,the development of ideal pollution treatment technology is the key to effectively deal with this problem.Among them,electrocatalytic oxidation technology can completely oxidize organic pollutants into inorganic substances such as CO2 and H2O,which is one of the very ideal degradation technologies.In the mid-1960s,Dutch scientist h.beer invented ruthenium titanium oxide coated electrode(called dimensional stability anode,DSA anode for short).It is widely used because of its excellent electrocatalytic activity,corrosion resistance and good stability.The process is efficient and environment-friendly.At present,lead dioxide electrode is widely used in Wastewater treatment,chlor alkali industry and other fields.But its application in some fields is hindered by the problem of lead dissolution and release.In this paper,Ti/SnO2-Sb electrode is selected as the research object.Compared with lead dioxide electrode,Ti/SnO2-Sb electrode is free of heavy metals,friendly to the environment,easy to obtain raw materials,low price,excellent oxidation ability and has a wide application prospect.In this paper,the electrode coating materials were prepared by sol-gel and thermal decomposition methods.Different electrodes were prepared by doping elements,and the electrochemical properties of the electrodes were a ffected by changing the surface density of electrodes.The purpose of improving the actual life of electrodes was achieved.Rhodamine B degradation tests were carried out to explore the electrocatalytic activity.(1)Ni doped Ti/SnO2-Sb electrode was prepared by sol-gel method and brushing thermal decomposition method.The structure was characterized by SEM,EDS,XRD and Raman,and physical chemistry and electrochemical properties were tested by CV,i-t and LSV.The results show that different brushing times have a significant impact on the surface morphology of the electrode.With the increase of calcination temperature,the electrode surface becomes more dense.Electrochemical research shows that after 60 times of brushing,the Ti/SnO2-Sb-Ni electrode at 450℃ sintering temperature shows better electrochemical performance.The electrode material doped with Ni has higher oxygen evolution potential.The electrocatalytic oxidation of Rhodamine B by Ti/SnO2-Sb-Ni electrode is caused by ·OH.The enhanced life test shows that the life of the electrode increases with the increase of brushing times and sintering temperature,including 60 times of brushing,The Ti/SnO2-Sb electrode at 650℃ sintering temperature has the longest anode strengthening life.(2)Further,Ni and F Doped Ti/SnO2-Sb electrodes will be prepared.The doping of F has many detailed changes on the surface morphology of the electrode.With the increase of calcination temperature,the electrode surface becomes more dense.The electrochemical study showed that the Ti/SnO2-Sb-Ni+F electrode at 450℃ sintering temperature showed better electrochemical performance after 60 times of brushing.Compared with Ti/SnO2-Sb-Ni,the stability of Ti/SnO2-Sb-Ni+F electrode was higher,the oxygen evolution potential of Ti/SnO2Sb-Ni+F electrode was higher than that of Ni doping.The doping of F significantly improves the strengthening life of the electrode.With the increase of brushing times and temperature,the life of the electrode increases significantly.Among them,the Ti/SnO2-Sb electrode with 60 brushing and 650℃ sintering temperature has the longest anode strengthening life.(3)In order to enhance the service life of the material,the Ni,F doped Ti/SnO2-Sb electrode was introduced into TiO2 to form a composite electrode material.The introduction of TiO2 significantly improved the flatness and uniformity of the electrode surface.With the increase of calcination temperature,the electrode surface became denser.The electrochemical study showed that after 60 times of brushing,the Ti/SnO2-Sb-Ni+F electrode at 650℃ sintering temperature showed excellent electrochemical performance and higher stability than Ti/SnO2-Sb-Ni.At the same time,the degradation of Rhodamine B by Ti/SnO2-Sb-Ni+F+TiO2 electrode was same as Ti/SnO2-Sb-Ni.The enhanced life test results show that the life of the electrode increases with the increase of brushing times and temperature,but the difference between the life of Ti/SnO2Sb-Ni+F+TiO2.Electrode under 30 brushing and 60 brushing is not very large,which may be due to the rapid deactivation of the electrode caused by the falling off of electrode surfactant during electrolysis.Although the doping of rutile TiO2 increases the surface density of the electrode,it does not significantly improve the electrochemical performance and service life of the electrode.In conclusion,Ti/SnO2-Sb-Ni electrode can produce O3 in situ.Ti/SnO2-Sb-Ni+F electrode has the longest acceleration life.Ti/SnO2-Sb-Ni+F+TiO2 can significantly improve the surface morphology of the electrode.The three electrodes have high oxygen evolution potential and can effectively degrade Rhodamine B.They are DSA anode materials with good performance. |
