title: In situ preparation of novel p-n junction photocatalyst BiOI/(BiO)2CO3 with enhanced visible light photocatalytic activity.
abstract: Novel p-n junction photocatalysts BiOI/(BiO)2CO3 with different contents of BiOI were in situ synthesized by etching (BiO)2CO3 precursor with hydroiodic acid (HI) solution. X-ray diffraction (XRD), field emission scanning electron microscopy (FE-SEM), Fourier transform infrared spectrometry (FT-IR), energy-dispersive spectroscopy (EDS) and UV-vis diffuse reflectance spectroscopy (DRS) were employed to study the structures, morphologies and optical properties of the as-prepared samples. Under visible light (λ>420 nm), BiOI/(BiO)2CO3 hybrid displayed much higher photocatalytic activity than pure (BiO)2CO3 and BiOI for the degradation of methyl orange (MO). The increased photocatalytic activity of BiOI/(BiO)2CO3 could be attributed to the formation of the p-n junction between p-BiOI and n-(BiO)2CO3, which effectively suppresses the recombination of photoinduced electron-hole pairs. Moreover, the tests of radical scavengers confirmed that •O2- and h+ were the main reactive species for the degradation of MO.
authors.affiliation: College of Chemistry and Materials Science, Huaibei Normal University, Huaibei 235000, Anhui, PR China. caojing@mail.ipc.ac.cn
authors.forename: Jing
authors.initials: J
authors.lastname: Cao
authors.forename: Xin
authors.initials: X
authors.lastname: Li
authors.forename: Haili
authors.initials: H
authors.lastname: Lin
authors.forename: Shifu
authors.initials: S
authors.lastname: Chen
authors.forename: Xianliang
authors.initials: X
authors.lastname: Fu
mesh_terms: D001391:Azo Compounds / Q000737:chemistry* / Q000528:radiation effects; D001729:Bismuth / Q000737:chemistry* / Q000528:radiation effects; D002384:Catalysis; D004396:Coloring Agents / Q000737:chemistry* / Q000528:radiation effects; D007454:Iodides / Q000737:chemistry* / Q000528:radiation effects; D008027:Light; D055668:Photochemical Processes; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000528:radiation effects; D018508:Water Purification / Q000379:methods
chemical_list: D001391:Azo Compounds; D004396:Coloring Agents; D007454:Iodides; D014874:Water Pollutants, Chemical; C100258:methyl orange; D001729:Bismuth