Cux-Bi25FeO40活化过硫酸盐降解水中磺胺嘧啶研究OA北大核心CSTPCD

This study focuses on the issue of sulfonamide antibiotic pollution in aquatic environments,targeting the pollutant sulfadiazine(SD),which has a higher environmental risk.A Cu-doped Cux-Bi25FeO40 bismuth ferrite composite material was prepared using a hydrothermal synthesis method and used to activate persulfate(PS)for the degradation of SD in water bodies.This study systematically analyzed the impact of factors such as the copper-iron doping molar ratio,composite material dosage,PS concentration,solution pH,and reaction temperature on the SD degradation rate of the Cux-Bi25FeO40/PS system.The experimental results showed that under a reaction time of 1 h and a copper-iron doping molar ratio of 1꞉1,the SD degradation effect in the PS system activated by bismuth ferrite was higher than that of the other doping ratios.Under the experimental conditions,as the initial pH of the reaction solution increased from 3 to 7,the degradation rate of SD in the water body increased by 64.1%,which was higher than that of the other three influencing factors.Single-factor optimization experimental results indicated that under the experimental conditions of a Cu-Bi25FeO40 dosage of 0.4 g·L-1,PS concentration of 4 mmol·L-1,pH of 5,and reaction temperature of 55℃,the SD degradation rate in the Cu-Bi25FeO40/PS reaction system was the highest.To analyze the impact of these factors and their interactive effects on the SD degradation rate in water,the Box-Behnken response surface method was used to establish a quadratic polynomial regression model with PS concentration,temperature,and pH value as variables.The model predicted the optimal degradation conditions for SD as a PS concentration of 5.1 mmol·L-1,a pH value of 6.6,and a temperature of 52℃,achieving a degradation rate of 96.7%.The relative deviation between the experimental verification results and the model predictions was less than 5%,confirming the reliability of the model,which can be used to predict the SD degradation rate in the Cu-Bi25FeO40/PS system.This study provides a theoretical basis and technical support for the treatment of SD pollution in aquatic environments using PS-activated bismuth ferrite.