Study On The Treatment Of Ceftazidime In Water With A Metal Oxide/nanographite Composite Electrode

Antibiotics are a kind of typical organic pollutants in Pharmaceutical and Personal Care Products?PPCPs?.Which are widely used in China.Antibiotics could inhibit biological activity,and biochemical degradation is not obvious.It is a kind of persistent pollutants.In order to further improve the treatment efficiency of antibiotic wastewater,advanced oxidation process began to gradually replace biological treatment technology to degrade antibiotic?including ceftazidime?wastewater.Electrocatalysis is a highly efficient advanced oxidation process.In electrocatalytic wastewater treatment systems,the performance of the electrode is critical in electrocatalytic reactors;currently,commercial dimensionally stable anodes?DSA?are widely used,but due to their complicated preparation process,high price,and the surface coating will fall into the water during the long time use,causing secondary pollution.Therefore,the preparation of an electrode with both excellent electrical conductivity and long-term cycle stability is to improve the electrocatalytic efficiency,and is the key to speeding up the degradation and reducing the generation of intermediate toxic substances.In this thesis,SnO_2/Nano-G,SnO₂-WO₃/Nano-G catalysts were prepared by solvothermal-calcine method,and the electrodes were prepared by hot pressing.Combined with structural characterization and actual electrocatalytic degradation tests,the effects of different metal oxide contents on the degradation properties of composites were investigated.The results show that the two electrodes have good removal effect on the simulated ceftazidime wastewater,indicating that the metal oxide modified Nano-G electrode improves the electrode oxidation ability while maintaining its good conductivity.Comparing the two electrodes,SnO₂-WO₃/Nano-G has higher degradation efficiency,which is due to the synergistic effect of bimetal oxides and the co-catalytic ability of WO₃,so that contaminants will not accumulate on the electrode surface,improving the efficiency and stability of the electrode.When the concentration of ceftazidime is 10 mg/L,and pH is close to neutral,and the electrode spacing is 3 cm,SnO₂-WO₃/Nano-G can completely convert mineralized pollutants into H₂O and CO₂ in only 40 minutes,achieving high efficiency and harmless degradation antibiotic wastewater.