期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 142, 期 -, 页码 598-603出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2013.05.079
关键词
Bi2O3; Surface modification; Multi-electron oxygen reduction; Visible light; Photocatalyst
资金
- National Natural Science Foundation of China (NSFC) [21273038]
- National Basic Research Program of China (973 Program) [2013CB632405]
Using a facile hydrothermal method, pure alpha-Bi2O3 samples with rod-like structure were synthesized. Amorphous Cu(II) clusters were loaded on the as-obtained alpha-Bi2O3 samples by an impregnation method. The prepared samples were characterized by X-ray diffraction, scanning electron and transmission microscopy, X-ray photoelectron spectroscopy, and UV-visible diffuse reflectance spectroscopy. The photocatalytic activities were evaluated from gaseous 2-propanol decomposition under visible light irradiation. It is found that crystal structure and the morphologies were not changed by the Cu(II) clusters modification. Pure Bi2O3 sample showed a limited photocatalytic activity due to its low conduction band edge. After Cu(II) clusters modification, the photocatalytic activity was significantly improved. The Cu(II) clusters play a critical role in the charge separation and efficient oxygen reduction, which explains the enhanced photocatalytic activity. (c) 2013 Elsevier B.V. All rights reserved.
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