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Improved photocatalytic decolorization of methyl orang over Pd‐doped Bi 2 O 3
Author(s) -
Zhong Junbo,
Li Jianzhang,
Feng Famei,
Fan Guangyin,
Zeng Jun,
Huang Shengtian,
Hu Wei,
Li Minjiao
Publication year - 2014
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.11919
Subject(s) - photocatalysis , x ray photoelectron spectroscopy , methyl orange , doping , materials science , scanning electron microscope , aqueous solution , visible spectrum , surface photovoltage , irradiation , nuclear chemistry , photochemistry , analytical chemistry (journal) , catalysis , chemistry , optoelectronics , chemical engineering , spectroscopy , organic chemistry , physics , composite material , quantum mechanics , engineering , nuclear physics
In this article, Pd‐doped Bi 2 O 3 photocatalysts with different molar ratios of Pd/Bi (1/100, 2/100, 3/100, 4/100, and 5/100) have been prepared by a facile sol–gel method. The photocatalysts prepared were characterized by Brunauer‐Emmett‐Teller method (BET), X‐ray diffraction (XRD), UV/Vis diffuse reflectance, scanning electron microscopy (SEM), X‐ray photoelectron spectroscopic (XPS) techniques, and surface photovoltage (SPV), respectively. The results indicate that Pd‐doped enhances the photo‐induced charge separation efficiency and leads to different electronic properties when Pd‐doped Bi 2 O 3 photocatalysts are illuminated by different wavelengths of light: one is an electron acceptor in the UV light region, while the other is an electron donor in the visible light region. The photocatalytic activity of Pd‐doped Bi 2 O 3 photocatalysts for decolorization of methyl orange aqueous solution was evaluated, the result shows that 4% Pd possesses the best photocatalytic activity under UV light irradiation and 3% Pd possesses the best photocatalytic activity under simulated sun light irradiation, and the possible reason is suggested. Doping with Pd is an effective way to promote the photocatalytic performance of Bi 2 O 3 . © 2014 American Institute of Chemical Engineers Environ Prog, 33: 1229–1234, 2014