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Mechanochemical synthesis of nanoparticulate ZnO–ZnWO4 powders and their photocatalytic activity

Dodd, Aaron, McKinley, Allan, Tsuzuki, Takuya and Saunders, Martin 2009, Mechanochemical synthesis of nanoparticulate ZnO–ZnWO4 powders and their photocatalytic activity, Journal of the European ceramic society, vol. 29, no. 1, pp. 139-144, doi: 10.1016/j.jeurceramsoc.2008.05.027.

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Title Mechanochemical synthesis of nanoparticulate ZnO–ZnWO4 powders and their photocatalytic activity
Formatted title Mechanochemical synthesis of nanoparticulate ZnO–ZnWO4 powders and their photocatalytic activity
Author(s) Dodd, Aaron
McKinley, Allan
Tsuzuki, Takuya
Saunders, Martin
Journal name Journal of the European ceramic society
Volume number 29
Issue number 1
Start page 139
End page 144
Publisher Elsevier
Place of publication Amsterdam, The Netherlands
Publication date 2009-01
ISSN 0955-2219
1873-619X
Keyword(s) milling
powders-solid state reaction
platelets
chemical properties
ZnO
Summary In this study, mechanochemical reaction systems with H2WO4 as a precursor were investigated for the synthesis of nanoparticulate powders of WO3, ZnWO4, and dual-phase (ZnWO4)x(ZnO)1–x. The objective was to establish whether mechanochemical processing can be used to manufacture high activity photocatalysts in the ZnO–WO3 system. Milling and heat treatment of H2WO4 + 12NaCl was found to result in the formation of irregularly shaped platelets of a sodium tungstate rather than nanoparticles of WO3. Powders of single-phase ZnWO4 and dual-phase (ZnWO4)x(ZnO)1–x were successfully synthesised by incorporating H2WO4 into the ZnCl2 + Na2CO3 + 4NaCl reactant mixture. The photocatalytic activity of these powders was evaluated using the spin-trapping technique with electron paramagnetic resonance spectroscopy. It was found that the photocatalytic activity decreased with the ZnWO4 content. This decrease in activity was attributed to the larger average particle size of the ZnWO4 component compared to the ZnO, which reduced the surface area available for interfacial transfer of the photogenerated charge carriers.
Language eng
DOI 10.1016/j.jeurceramsoc.2008.05.027
Field of Research 100708 - Nanomaterials
HERDC Research category C1.1 Refereed article in a scholarly journal
HERDC collection year 2009
Copyright notice ©2008, Elsevier Ltd.
Persistent URL http://hdl.handle.net/10536/DRO/DU:30020685

Document type: Journal Article
Collection: Centre for Material and Fibre Innovation
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Created: Wed, 21 Oct 2009, 16:28:16 EST by Takuya Tsuzuki

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