Visible light-driven characterisation of AgI/CeO2/rGO nanocomposites and their application in levofloxacin degradation

AgI/CeO2/rGO complexes were prepared in different proportions and characterized by XRD, SEM, TEM, FT-IR, XPS, BET, PL, I-T and EIS. The photocatalytic degradation experiments of levofloxacin (LVF) under visible light (λmax=245 nm) was performed to determined the photocatalytic activity of the composites. When the concentration of simulated pollutants is 20 mg/L and the amount of application is 15 mg, the doping ratio is AgI/CeO2/3%-rGO, and the photocatalytic effect of the nanocomposite with pH 5 is the best. The maximum photocatalytic degradation rate of 98.02% can be achieved. The cyclic stability of the composites and the kinetics were also analyzed, and possible degradation mechanisms were also proposed. The intermediates were also detected using high performance liquid chromatography-mass spectrometry(HPLC-MS) to obtain the possible degradation process. The results show that AgI/CeO2/rGO composite exhibits good photocatalytic degradation performance under visible light, and the maximum photocatalytic degradation rate for treating pollutants containing LVF is 98.02%. These findings are expected to provide important theoretical and practical guidance for environmental treatment and research and development of photocatalytic materials.