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

Aaron Dodd, Allan Mckinley, T. Tsuzuki, Martin Saunders

Research output: Contribution to journalArticle

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Abstract

In this study, mechanochemical reaction systems withH2WO4 as a precursor were investigated for the synthesis of nanoparticulate powders ofWO3,ZnWO4, and dual-phase (ZnWO4)x(ZnO)1–x. The objective was to establish whether mechanochemical processing can be used to manufacture highactivity photocatalysts in the ZnO–WO3 system. Milling and heat treatment of H2WO4 + 12NaCl was found to result in the formation of irregularlyshaped platelets of a sodium tungstate rather than nanoparticles ofWO3. Powders of single-phase ZnWO4 and dual-phase (ZnWO4)x(ZnO)1–x weresuccessfully synthesised by incorporating H2WO4 into the ZnCl2 +Na2CO3 + 4NaCl reactant mixture. The photocatalytic activity of these powderswas evaluated using the spin-trapping technique with electron paramagnetic resonance spectroscopy. It was found that the photocatalytic activitydecreased with the ZnWO4 content. This decrease in activity was attributed to the larger average particle size of the ZnWO4 component comparedto the ZnO, which reduced the surface area available for interfacial transfer of the photogenerated charge carriers.
Original languageEnglish
Pages (from-to)139-144
JournalJournal of the European Ceramic Society
Volume29
Issue number1
DOIs
Publication statusPublished - 2009

Fingerprint

Powders
Milling (machining)
Photocatalysts
Platelets
Charge carriers
Paramagnetic resonance
Particle size
Heat treatment
Sodium
Spectroscopy
Nanoparticles
Processing
sodium tungstate(VI)

Cite this

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title = "Mechanochemical synthesis of nanoparticulate ZnO-ZnWO4 powders and their photocatalytic activity",
abstract = "In this study, mechanochemical reaction systems withH2WO4 as a precursor were investigated for the synthesis of nanoparticulate powders ofWO3,ZnWO4, and dual-phase (ZnWO4)x(ZnO)1–x. The objective was to establish whether mechanochemical processing can be used to manufacture highactivity photocatalysts in the ZnO–WO3 system. Milling and heat treatment of H2WO4 + 12NaCl was found to result in the formation of irregularlyshaped platelets of a sodium tungstate rather than nanoparticles ofWO3. Powders of single-phase ZnWO4 and dual-phase (ZnWO4)x(ZnO)1–x weresuccessfully synthesised by incorporating H2WO4 into the ZnCl2 +Na2CO3 + 4NaCl reactant mixture. The photocatalytic activity of these powderswas evaluated using the spin-trapping technique with electron paramagnetic resonance spectroscopy. It was found that the photocatalytic activitydecreased with the ZnWO4 content. This decrease in activity was attributed to the larger average particle size of the ZnWO4 component comparedto the ZnO, which reduced the surface area available for interfacial transfer of the photogenerated charge carriers.",
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Mechanochemical synthesis of nanoparticulate ZnO-ZnWO4 powders and their photocatalytic activity. / Dodd, Aaron; Mckinley, Allan; Tsuzuki, T.; Saunders, Martin.

In: Journal of the European Ceramic Society, Vol. 29, No. 1, 2009, p. 139-144.

Research output: Contribution to journalArticle

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AU - Saunders, Martin

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AB - In this study, mechanochemical reaction systems withH2WO4 as a precursor were investigated for the synthesis of nanoparticulate powders ofWO3,ZnWO4, and dual-phase (ZnWO4)x(ZnO)1–x. The objective was to establish whether mechanochemical processing can be used to manufacture highactivity photocatalysts in the ZnO–WO3 system. Milling and heat treatment of H2WO4 + 12NaCl was found to result in the formation of irregularlyshaped platelets of a sodium tungstate rather than nanoparticles ofWO3. Powders of single-phase ZnWO4 and dual-phase (ZnWO4)x(ZnO)1–x weresuccessfully synthesised by incorporating H2WO4 into the ZnCl2 +Na2CO3 + 4NaCl reactant mixture. The photocatalytic activity of these powderswas evaluated using the spin-trapping technique with electron paramagnetic resonance spectroscopy. It was found that the photocatalytic activitydecreased with the ZnWO4 content. This decrease in activity was attributed to the larger average particle size of the ZnWO4 component comparedto the ZnO, which reduced the surface area available for interfacial transfer of the photogenerated charge carriers.

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