Journal
CHEMICAL ENGINEERING JOURNAL
Volume 148, Issue 2-3, Pages 263-269Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2008.08.039
Keywords
N-containing ZnO powder; Photocatalyst; Heat treatment; Activity; Characterization
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Funding
- Natural Science Foundation of China [20673042]
- Natural Science Foundation of Anhui Province [070415211]
- Ministry of Education of China [208062]
- Natural Science Foundation of Anhui Provincial Education Committee [KJ2007A015]
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N-containing ZnO photocatalyst was prepared by decomposition of zinc nitrate at different heat treatment conditions. The photocatalyst was characterized by DRS, XRD, TG-DTA, XPS, and BET analysis. The results show that the optimum preparation condition for N-containing ZnO is at 350 degrees C for 3 h, and the sample shows higher photocatalytic activity. The photo-absorption wavelength range of the samples is shifted to long wavelength. Compared with pure ZnO, the samples show higher visible-light photocatalytic activity. However, under UV irradiation, the photocatalytic reduction activity of the N-containing ZnO is higher than that of pure ZnO, and the photocatalytic oxidation activity of the N-containing ZnO is much lower than that of pure ZnO. It is proposed that the change of photocatalytic activity of the sample should be attributed to the nitrogen introduction. The doped nitrogen atoms in a ZnO crystal lattice will probably cause the conductivity conversion of the sample from n-type to p-type. (C) 2008 Elsevier B.V. All rights reserved.
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