Synthesis Of Ce-Fe-Zn/AC Catalyst And Study On Catalytic Ozonation For Degradation Of Sulfachloropyridazine Sodium Wastewater

Now,the water enviro nment is seriously threatened by the massive use of antibiotics.Antibiotic wastewater has the characteristics of high chemical oxygen demand,high SS content in wastewater,and complex components,and is difficult to biodegrade.Sulfachloropyridazine sodium is a new generation of broad-spectrum antibacterial drugs that play a significant role in the treatment of E.coli and Pasteurella infections in livestock and poultry.However,wastewater containing residual sulfa has a strong inhibitory effect on the growth of microorganisms in water bodies and may cause damage to the water enviro nment.With the large-scale use of antibiotics,the resistance of bacteria is also increasing,but there is little research on the treatment of sulfachloropyridazine sodium wastewater.Therefore,it is necessary to find an efficient wastewater treatment method to remove sulfachloropyridazine sodium in wastewater.The traditional wastewater treatment technology has certain limitations in the removal of high-concentration organic wastewater.Heterogeneous catalytic ozonation technology has received more and more attention because of its advantages of fast reaction,no secondary pollution and high treatment efficiency.etc.Ozone is a strong oxidant,and its redox potential in water is 2.07 V.Under the catalysis of the active site of the catalyst,ozone can react to generate ·OH radicals,and the oxidation ability is stronger.The free radical destroys organic macromolecules to form small molecules of inorganic matter or carbon dioxide and water by combining with organic molecules,thereby reducing the toxicity of wastewater.In this paper,commercial sulfachloropyridazine sodium was used to configure a solution with a certain concentration as the reference wastewater,and the COD value was used as the evaluation standard.In the experiment,activated carbon was used as the carrier,and the supported metal oxide catalyst Ce-Fe-Zn/AC was prepared by chemical co-precipitation method,and the best preparation process was determined.The experimental results show that when Ce: Fe: Zn(molar ratio)= 1: 0.3: 0.02,the mass of the carrier(AC)is 10 g,and the calcination temperature is 350 ?,the catalyst has higher activity.The influencing factors such as reaction temperature,PH,amount of catalyst and number of repeated use were investigated to explore the process conditions of catalytic ozone degradation of sulfachloropyridazine sodiumwastewater.The results show that when the amount of catalyst added is 1.5 g / 0.1 L,the solution PH = 10,and the wastewater reaction temperature is 25 ?,the catalyst has the best degradation efficiency for sulfachloropyridazine sodium wastewater,with a degradation rate of 95.70 %.The lower the initial concentration of wastewater,the better the degradation effect.When the initial concentration is COD = 614 mg/L,the degradation rate can reach 97.4 %.In order to investigate the stability of the catalyst,the catalyst was reused eight times under optimal conditions.After repeated use eight times,the degradation rate of sulfachloropyridazine sodium wastewater can still reach81.6 %,indicating that the catalyst has good stability.The catalyst was characterized by BET,SEM,XPS,FTIR,XRD and other methods to explore the PHysical structure and properties of the catalyst.Finally,a kinetic study on the catalytic degradation of sulfachloropyridazine sodium wastewater showed that the catalytic ozonation reaction conforms to first-order reaction kinetics.Using TBA and PHos PHate,the experimental mechanism of catalytic ozone oxidation degradation of sulfachloropyridazine sodium wastewater was verified.