Metal Oxide/graphite Cathode For H₂O₂ Production And Degradation Of Norfloxacin In Water

Nowadays,due to the abuse and improper treatment of antibiotics,they are widespread in the natural environment and have a very bad impact on the environment,and cause potential toxicity to organisms in the environment,and ultimately endanger human health.Therefore,it has become an important research topic in the world to seek an environmentally sustainable method to effectively remove antibiotics.Advanced oxidation process（AOP）can effectively degrade antibiotics in wastewater by generating active groups with strong oxidation ability,among which electrocatalytic oxidation technology is a very promising AOP.In the process of electrocatalytic oxidation degradation of pollutants,the performance of the electrode plays a crucial role.The selection of appropriate cathode materials can not only inhibit the occurrence of side reactions,but also enhance the degradation effect of pollutants through the cathodic oxygen reduction reaction to generate hydrogen peroxide and free radicals.In this thesis,CeO₂/Nano-G and Zn O-CeO₂/Nano-G composites were prepared by in-situ solvothermal growth method and impregnation sintering method,respectively.The results show that the concentration of H₂O₂ and·OH generated by Zn O-CeO₂/Nano-G composite electrode is higher than that of CeO₂/Nano-G composite electrode,and both of them have good degradation effect on norfloxacin,among which Zn O-CeO₂/Nano-G composite electrode is the best The degradation efficiency of polar is higher.The results show that the oxygen reduction ability of the cathode is enhanced by the loading of metal oxides,which increases the degradation performance of the electrode.The synergistic effect of bimetallic oxides not only improves the electron transport performance,but also enhances the efficiency and stability of the electrode.When 0.1mol/l Na₂SO₄ solution was used as electrolyte,the electrode spacing was 3cm,the initial concentration of norfloxacin was 10mg/L,the applied current density was 30m A·cm^-2,and the p H of electrolyte was 3,the removal efficiency of the two electrodes was the best,88.6%and 98.2%respectively.