title: Visible light photocatalytic activity enhancement and mechanism of AgBr/Ag3PO4 hybrids for degradation of methyl orange.
abstract: Novel AgBr/Ag(3)PO(4) hybrids were synthesized via an in situ anion-exchange method and characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), energy-dispersive spectroscopy (EDS) and UV-vis diffuse reflectance spectroscopy (DRS). Under visible light (λ>420 nm), AgBr/Ag(3)PO(4) degraded methyl orange (MO) efficiently and displayed much higher photocatalytic activity than that of pure AgBr or Ag(3)PO(4). X-ray photoelectron spectroscopy (XPS) suggests that AgBr/Ag(3)PO(4) transformed to be Ag@AgBr/Ag(3)PO(4)@Ag system while remained good photocatalytic activity after 5 times of cycle experiments. In addition, the quenching effects of different scavengers proved that reactive OH and h(+) played the major role for the MO degradation. The photocatalytic activity enhancement of AgBr/Ag(3)PO(4) is closely related to the efficient separation of electron-hole pairs derived from the matching band potentials between AgBr and Ag(3)PO(4), as well as the good electron trapping role of Ag nanoparticles in situ formed on the surfaces of AgBr and Ag(3)PO(4) particles during the photocatalytic reaction.
authors.affiliation: College of Chemistry and Materials Science, Huaibei Normal University, Anhui, Huaibei, China. caojing@mail.ipc.ac.cn
authors.forename: Jing
authors.initials: J
authors.lastname: Cao
authors.forename: Bangde
authors.initials: B
authors.lastname: Luo
authors.forename: Haili
authors.initials: H
authors.lastname: Lin
authors.forename: Benyan
authors.initials: B
authors.lastname: Xu
authors.forename: Shifu
authors.initials: S
authors.lastname: Chen
mesh_terms: D001391:Azo Compounds / Q000737:chemistry*; D001965:Bromides / Q000737:chemistry*; D002384:Catalysis; D008027:Light; D010710:Phosphates / Q000737:chemistry*; D055668:Photochemical Processes; D056951:Photoelectron Spectroscopy; D018030:Silver Compounds / Q000737:chemistry*; D014961:X-Ray Diffraction
chemical_list: D001391:Azo Compounds; D001965:Bromides; D010710:Phosphates; D018030:Silver Compounds; C100258:methyl orange; C047751:silver bromide; C039072:silver phosphate