Mechanochemical synthesis of nanocrystalline SnO2-ZnO photocatalysts
Data(s) |
14/02/2006
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Resumo |
Mechanochemical processing of anhydrous chloride precursors with Na<sub>2</sub>CO<sub>3</sub> has been investigated as a means of manufacturing nanocrystalline SnO<sub>2</sub> doped ZnO photocatalysts. High-energy milling and heat-treatment of a 0.1SnCl<sub>2</sub>+0.9ZnCl<sub>2</sub>+Na<sub>2</sub>CO<sub>3</sub>+4NaCl reactant mixture was found to result in the formation of a composite powder consisting of oxide grains embedded within a matrix of NaCl. Subsequent washing with deionized water resulted in removal of the NaCl matrix phase and partial hydration of the oxide reaction product with the consequent formation of ZnSn(OH)<sub>6</sub>. The extent of this hydration reaction was found to decrease in a linear fashion with the temperature of the post-milling heat-treatment over the range of 400–700 °C. For a heat-treatment temperature of 700 °C, the SnO<sub>2</sub> doped ZnO powder was found to exhibit significantly higher photocatalytic activity than either single-phase SnO<sub>2</sub> or ZnO powders that were synthesized using similar processing conditions. The heightened photocatalytic activity of the SnO<sub>2</sub> doped ZnO was attributed to its higher specific surface area and the enhanced charge separation arising from the coupling of ZnO with SnO<sub>2</sub>.<br /> |
Identificador | |
Idioma(s) |
eng |
Publicador |
Institute of Physics Publishing |
Relação |
http://dro.deakin.edu.au/eserv/DU:30022534/tsuzuki-mechanochemicalsynthesis-2006.pdf http://dx.doi.org/10.1088/0957-4484/17/3/013 |
Direitos |
2006, IOP Publishing Ltd |
Tipo |
Journal Article |