Premium
Microemulsion Synthesis, Characterization of Highly Visible Light Responsive Rare Earth‐Doped Bi 2 O 3
Author(s) -
Wu Shuxing,
Fang Jianzhang,
Xu Xiaoxin,
Liu Zhang,
Zhu Ximiao,
Xu Weicheng
Publication year - 2012
Publication title -
photochemistry and photobiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.818
H-Index - 131
eISSN - 1751-1097
pISSN - 0031-8655
DOI - 10.1111/j.1751-1097.2012.01164.x
Subject(s) - dopant , photocatalysis , materials science , diffuse reflectance infrared fourier transform , microemulsion , photoluminescence , visible spectrum , diffuse reflection , analytical chemistry (journal) , doping , spectroscopy , methyl orange , powder diffraction , calcination , nuclear chemistry , catalysis , chemistry , crystallography , pulmonary surfactant , optics , organic chemistry , biochemistry , physics , optoelectronics , quantum mechanics
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.