Journal
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
Volume 178, Issue 20, Pages 1371-1379Publisher
ELSEVIER
DOI: 10.1016/j.mseb.2013.08.008
Keywords
Heterojunction; ZnO-SnO2; Coprecipitation; Methylene blue; Photocatalysis
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Nanocomposites of coupled ZnO-SnO2 photocatalysts were synthesized by the coprecipitation method and were characterized by X-ray diffraction, UV-vis diffuse reflectance spectroscopy, surface area analyzer and scanning electron microscopy. Their photocatalytic activity was investigated under UV, visible and solar light and evaluated using methylene blue (MB) as a model pollutant. The performance of the coupled ZnO-SnO2 photocatalysts was found to be related to the Zn/Sn molar ratio and to the calcination conditions. The photocatalyst with a Zn/Sn molar ratio of 1:0.05 calcined at 600 degrees C for 2 h showed the maximum degradation rate of MB under different lights used. Its photocatalytic activity was found to be about two times that of ZnO and about 10 times that of SnO2 which can be explained by the heterojunction effect. Charge separation mechanism has been studied. (C) 2013 Elsevier B.V. All rights reserved.
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