Construction Of Yolk-shell Microreactor And Analysis Of Pollutant Degradation By Fenton-like Reactio

The low absorption capacity for bios on antibiotics,so most of antibiotics often discharged into water environment in the form of excreta,posing a serious threat to human health and ecological environment.Therefore,it is urgent to solve the problem of antibiotic water pollution.In this paper,by constructing yolk-shell microreactor with encapsulate the Prussian Blue Analogue(PBA)into polypyrrole(PPy)shell and utilizing Fenton-like reaction to degrade antibiotics in water.It not only exhibits high degradation efficiency,but also effectively inhibits the leaching of toxic metal ions,avoiding the occurrence of secondary pollution.The specific research contents are as follows:(1)The "double-yolk egg-like" Fe3O4/PBA@PPy microreactor was synthesized using Fe3O4@PPy precursor via a reactive-template method and utilized as catalysts to degrade tetracycline in Fenton-like reaction.The degradation rate of Fe3O4/PBA@PPy10(0.38 L·min·mol-1)was 5.1 times than that of the reference Fe3O4/PBA-10(0.074 L·min·mol-1)with the help of confinement effect.Besides,the concentration of leached cobalt ions was reduced from 1.47 mg/L to 0.174 mg/L by the protective function from the PPy shell.The "double-yolk egg-like" Fe3O4/PBA@PPy microreactor displayed the high recyclability,84.5%of activity was still remained even after the 4th cycle.(2)The yolk-shell microreactor with coordinately unsaturated metal sites(CUMSs)was constructed and the PBA@PPy as precursor.PBA@PPy-250-12 displayed maximum PMS utilization efficiency(37.7%),the highest removal efficiency(92.1%)and the best mineralization performance(69.7%)with the help of confinement effect and CUMSs generation.The amount of CUMSs were function as Lewis acid,and the PMS adsorption and activation were favored by Lewis acid-base reaction.The contribution of both ·OH and 1O2 were remarkably prompted in PBA@PPy-25012+PMS system,which due to confinement effect.Besides,the PPy shell becomes more compact after calcination process,the leached metal ions was effectively confined inside the microreactor.