Preparation Of Ti/SnO₂-Sb-Ni Electrode And Degradation Mechanism Of CAP Wastewater

Since the 19th National Congress of the Communist Party of China,the safety of the water environment has attracted the attention of the people,and researchers have gradually carried out extensive research on the prevention and control of water pollution.China's water pollution control is already in a bottleneck period,the main reason is due to the lack of effective water treatment technology,resulting in China's water pollution can not be better prevented.Since the 19th National Congress of the Communist Party of China,the safety of the water environment has attracted the attention of the people,and researchers have gradually carried out extensive research on the prevention and control of water pollution.Antibiotic drugs are a type of persistent organic pollutants?PPCPs?,which are commonly found in surface water,groundwater and even tap water.The presence of antibiotics has been detected,which poses a huge threat to human and biological health.Advanced oxidation technology plays an important role in the prevention and control of water pollution.Electrocatalytic oxidation technology is a kind of advanced oxidation technology.During the electrocatalytic reaction,active substances will be generated to decompose pollutants in water.However,the development of electrochemical technology has encountered The problem is mainly the problem of the electrode,the first highly active electrode,the second long-life electrode and the third cheap electrode.The electrode is the core of the electrocatalytic oxidation technology,so researching the electrode with high catalytic activity and long life is one of the research focuses.Secondly,taking chloramphenicol wastewater as an example to study the energy efficiency relationship of electrocatalytic oxidation.In the study,the Sol-gel method was used to prepare Ti/SnO₂-Sb-Ni electrode and Ti/SnO₂-Sb electrode,and the electrode was characterized.Stable,the particle size of the Ti/SnO₂-Sb-Ni electrode surface is small,the coating is uniform and compact,and the oxygen absorption potential is higher and the life is longer.The Ti and antimony oxide electrodes on the titanium substrate have the best reaction conditions for electrocatalytic oxidation of CAP wastewater.Under the conditions of current density of 20 mA/cm²,initial reaction pH of 7,stirring speed of 500rpm,electrode spacing of 2cm,electrolyte selection of Na₂SO₄,Na₂SO₄ concentration of 6.25 g/L?0.044mol/L?,the reaction effect is the best.After 300 minutes of catalytic reaction,the CAP removal in the wastewater exceeds 99%,and the TOC removal rate exceeds 65%.CAP has antibacterial activity against Escherichia coli.After treating CAP wastewater under the optimal treatment conditions,the effluent after 180 minutes of reaction has no antibacterial activity.In the free radical quenching experiment using ethanol and tert-butanol as quenching agents,it was found that OH?and SO₄^-?will be produced in the electrocatalytic system to improve the efficiency of electrocatalytic oxidation.When ethanol is used as a quencher,the electrode coating will be damaged,resulting in shortened electrode life.In the process of electrocatalytic oxidation,the anode chamber and the cathode chamber have different degradation effects and degradation mechanisms on the CAP.The anode chamber mainly degrades the CAP through direct oxidation and indirect oxidation,and both the removal rate and mineralization rate of CAP in wastewater Better,the cathode mainly decomposes CAP through reduction,but the decomposition of CAP is not complete,the removal rate of CAP is high but the mineralization rate is less than 5%,indicating that the reduction of CAP is only part of the functional group and does not change the overall characteristics of CAP.There is antibacterial activity,and the color of the wastewater is yellow.Therefore,the electrocatalytic treatment of CAP wastewater is based on anodic oxidation,and the cathode plays an auxiliary role.