Abstract
In this article, Pd‐doped Bi2O3 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 Bi2O3 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 Bi2O3 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 Bi2O3. © 2014 American Institute of Chemical Engineers Environ Prog, 33: 1229–1234, 2014
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