title: Microemulsion synthesis, characterization of highly visible light responsive rare earth-doped Bi2O3.
abstract: In this paper, Bi(2)O(3) and rare earth (La, Ce)-doped Bi(2)O(3) visible-light-driven photocatalysts were prepared in a Triton X-100/n-hexanol/cyclohexane/water reverse microemulsion. The resulting materials were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Brunauer-Emmett-Teller (BET) surface area, photoluminescence spectra (PLS) and UV-Vis diffuse reflectance spectroscopy. The XRD patterns of the as-prepared catalysts calcined at 500 °C exhibited only the characteristic peaks of monoclinic α-Bi(2)O(3). PLS analysis implied that the separation efficiency for electron-hole has been enhanced when Bi(2)O(3) was doped with rare earth. UV-Vis diffuse reflectance spectroscopy measurements presented an extension of light absorption into the visible region. The photocatalytic activity of the samples was evaluated by degradation of methyl orange (MO) and 2,4-dichlorophenol (2,4-DCP). The results displayed that the photocatalytic activity of rare earth-doped Bi(2)O(3) was higher than that of dopant-free Bi(2)O(3). The optimal dopant amount of La or Ce was 1.0 mol%. And the mechanisms of influence on the photocatalytic activity of the catalysts were discussed.
authors.affiliation: School of Chemistry and Environment, South China Normal University, Guangzhou, China.
authors.forename: Shuxing
authors.initials: S
authors.lastname: Wu
authors.forename: Jianzhang
authors.initials: J
authors.lastname: Fang
authors.forename: Xiaoxin
authors.initials: X
authors.lastname: Xu
authors.forename: Zhang
authors.initials: Z
authors.lastname: Liu
authors.forename: Ximiao
authors.initials: X
authors.lastname: Zhu
authors.forename: Weicheng
authors.initials: W
authors.lastname: Xu
mesh_terms: D001391:Azo Compounds / Q000737:chemistry; D001729:Bismuth / Q000737:chemistry*; D002384:Catalysis; D002563:Cerium / Q000737:chemistry*; D002733:Chlorophenols / Q000737:chemistry; D003510:Cyclohexanes / Q000737:chemistry; D004655:Emulsions; D000441:Hexanols / Q000737:chemistry; D006358:Hot Temperature; D007811:Lanthanum / Q000737:chemistry*; D008027:Light; D008163:Luminescent Measurements; D046529:Microscopy, Electron, Transmission; D017830:Octoxynol / Q000737:chemistry; D055668:Photochemical Processes; D013056:Spectrophotometry, Ultraviolet; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction
chemical_list: D001391:Azo Compounds; D002733:Chlorophenols; D003510:Cyclohexanes; D004655:Emulsions; D000441:Hexanols; D014867:Water; D002563:Cerium; C100258:methyl orange; C036260:1-hexanol; D007811:Lanthanum; D017830:Octoxynol; C033301:bismuth oxide; C004762:2,4-dichlorophenol; D001729:Bismuth