▎ 摘　　要

Silver ferrite-graphene (AgFeO2-G) as a nanocomposite photocatalyst shows potent visible-light photocatalytic activity for the degradation of organic contaminants, and generates the strong oxidants hydroxyl radical ((OH)-O-center dot) and superoxide anion radical (O-2(center dot-)) via photoelectrochemical decomposition of H2O and O-2 in the presence of air and visible light irradiation. The photogenerated electrons of AgFeO2 can transfer easily from the conduction band to the reduced graphene oxide, efficiently preventing the direct recombination of electrons and holes. As a matter of fact, AgFeO2 has a low bandgap. Furthermore, AgFeO2 nanoparticles themselves have a magnetic property, which makes them magnetically separable. The experimental results show that the graphene nanosheets in the nanocomposite catalyst are exfoliated and decorated homogeneously with AgFeO2 nanoparticles. The photodegradation occurs in a short time (ca 40min). Also, the photocatalytic activity of the nanocomposite does not show any clear loss after ten recycles of the degradation process.