Synthesis and photocatalytic activity of ZnO/ZnO2 composite
Resource
Journal of Photochemistry and Photobiology A: Chemistry 172 (3): 269-274
Journal
Journal of Photochemistry and Photobiology A: Chemistry
Journal Volume
172
Journal Issue
3
Pages
269-274
Date Issued
2005
Date
2005
Author(s)
Hsu, Chin-Cheng
Abstract
ZnO/ZnO2composite photocatalysts were synthesized by hydrothermal treatment at 120-180 °C of ZnO2, which in turn was obtained from an aqueous solution of ZnSO4 and H2O2. The composite particles showed morphology of ZnO prismatic crystallites with small ZnO2 granules "fused"; at surface. Photocatalytic activity was characterized based on photocatalytic degradation of methyl orange under UV-light (300 nm) illumination, and the maximum activity was observed for the powder with an intermediate ZnO2-to-ZnO conversion. The enhanced activity, as compared with the pure ZnO crystallites, has been attributed to the presence of the intimately bonded ZnO/ZnO2 surface hetero-structure. This study also points out a new approach to synthesize a composite photocatalyst containing strongly coupled constituents by phase transformation reactions among the constituents. © 2004 Elsevier B.V. All rights reserved.
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journal article
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