Journal
APPLIED CATALYSIS A-GENERAL
Volume 334, Issue 1-2, Pages 51-58Publisher
ELSEVIER
DOI: 10.1016/j.apcata.2007.09.033
Keywords
photocatalysis; visible light; Ag2ZnGeO4; dye degradation; rhodamine B; orange II
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We report a multiple-metal oxide Ag2ZnGeO4 With cristobalite-related structure as a visible light-sensitive photocatalyst (Eg 2.29 eV) for dye degradation. The physical characteristics of the samples were examined by techniques such as XRD, UV-vis diffuse reflectance spectroscopy and SEM. The photocatalytic activity of Ag2ZnGeO4 was confirmed by Rhodamine B (RhB) and Orange II photodegradation in aqueous phase. After 360 min of visible light (lambda > 420 nm) irradiation, the conversions of RhB and Orange II reached 100% and 69.2%, respectively. The electronic structure of Ag2ZnGeO4 was investigated by band structure calculation based on the density function theory (DFY). Results revealed that the hybridized Ag 4d(10) and O 2P(6) orbitals form the valence band top of Ag2ZnGeO4, which leads to a much narrowed band gap as compared with that of the Na2ZnGeO4 parent sample. We propose that the specific cristobalite structure of Ag2ZnGeO4 favors the mobility of photo-generated carriers, and that this contributes positively to the observed photocatalytic activity for dye degradation. (c) 2007 Elsevier B.V. All rights reserved.
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