| In recent decades,along with the rapid development of human society,people’s living standards and quality of life have been significantly improved,accompanied by the continuous improvement of people’s requirements for living environment.Water is the source of life and its importance to humanity is beyond doubt.However,the harm caused by the continuous progress of industrialization has also emerged with the development of society,and water resources have been seriously harmed.Among them,the harm of organic pollution to water resources cannot be ignored.Traditional treatment processes（biological,physical）have been unable to cope with the huge amount of organic wastewater produced in today’s society.Therefore,since the invention of electrochemical oxidation in the 1940s,this method has been regarded as an efficient and environmentally friendly treatment method,which has been studied by scholars from all walks of life and intends to be applied to industrial production.The method generates·OH in the degradation process of organic wastewater,and·OH is a strong oxidant which has strong oxidizing property and does not cause secondary pollution,and can effectively degrade organic poisoning substances.At the same time,the electrochemical oxidation method has been widely concerned because of its ease of combination with other treatment methods,small footprint,and easy process automation.The most important part of the development of electrochemical oxidation technology is the electrode.Titanium-based tin dioxide electrode has become a research hotspot because of its high oxygen evolution potential,high catalytic activity,simple preparation process and easy doping modification.However,in the process of use,the Ti/Sb-SnO2 electrode has problems of low degradation efficiency,short service life and low power utilization.In this paper,the paper uses this titanium matrix to prepare titanium-based tin dioxide,which is characterized by physical properties,phone chemical catalytic oxidation performance,electrochemical performance detection and stability detection.The optimum substrate for the preparation of the titanium-based tin dioxide electrode was determined.The main research conclusions are as follows:（1）The surface active layer of Ti/SnO2-Sb-La electrode prepared by thermal decomposition method is more refined than flat Ti/SnO2-Sb-La,and The phenomenon of"cracking"and"agglomeration"was significantly improved,and there was no significant change in the network of Ti/SnO2-Sb-La and copper-coated Ti/SnO2-Sb-La electrodes.The results of electrochemical experiments show that the electrode prepared by porous titanium has obvious characteristics of high oxygen evolution potential（2.09V）and low membrane resistance（5.722V）.At the same time,the experimental results of catalytic degradation of organic pollutants with simulated phenol wastewater indicate that the degradation efficiency of phenol can reach 90.8%and the COD removal rate can reach 79.9%.The enhanced life time is 105min.It is 5 times that of a flat titanium substrate electrode.Under the same apparent area,the catalytic properties of the reticulated Ti/SnO2-Sb-La and titanium-coated copper Ti/SnO2-Sb-La electrodes are lower than those prepared by using flat titanium as the matrix.At the same time,the accelerated life test results have also been reduced.（2）By comparing the electrodes prepared by porous titanium substrates with different pore diameters,the porous titanium matrix with a pore size of 30μm exhibited the most excellent performance,and was superior to other pore-base electrodes in terms of degradation efficiency and stability.Firstly,the porous titanium with a pore size of 30μm is used as the matrix to make the surface layer of the active layer more excellent,and the binding force between the active layer and the substrate is improved,so that the stability is improved compared with other apertured substrate electrodes.The 160μm pore size matrix has certain advantages in surface specific surface area.Therefore,the test results of the cyclic voltammetry curve of the electrode prepared by the matrix are better,but the combination effect of the matrix and the surface activity is poor.Therefore,in general,the 160μm aperture base electrode did not exhibit very good overall performance. |
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