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In Situ X-ray Absorption Spectroscopy/Energy-Dispersive X-ray Diffraction Studies on the Hydrothermal Formation of Bi2W1-xMoxO6 Nanomaterials


Zhou, Y; Antonova, E; Lin, Y; Grunwaldt, J D; Bensch, W; Patzke, Greta R (2012). In Situ X-ray Absorption Spectroscopy/Energy-Dispersive X-ray Diffraction Studies on the Hydrothermal Formation of Bi2W1-xMoxO6 Nanomaterials. European Journal of Inorganic Chemistry, (5):783-789.

Abstract

Bi2WO6 has attracted considerable interest as a visible-lightdriven photocatalyst with a layered Aurivillius structure. The catalytic performance of bismuth tungstate is notably enhanced through the partial substitution of tungsten with molybdenum. Whereas hydrothermally obtained Bi2W1-xMoxO6 solid solutions maintain the Bi2WO6 structure, their morphologies vary with the molybdenum content. Lower Mo contents (x < 0.5) favor the formation of hierarchically nanostructured microspheres that consist of sheet-like building blocks. Their disintegration is observed for greater extents of W/Mo substitution, hand in hand with a decrease in the surface area. Raman spectra furthermore indicate changes in the local structure of the octahedral W/Mo moieties upon variation of the Mo content. As little is known about the growth kinetics and hydrothermal formation processes of nanostructured Bi2W1-xMoxO6 catalysts, in situ XAS investigations were performed to determine the onset of their hydrothermal formation from Bi(NO3)(3)center dot 5H(2)O, K2WO4 and Na2MoO4. In situ energy- dispersive X-ray diffraction (EDXRD) experiments revealed a correlation between particle shape, Mo content and formation pathway of the Bi2W1-xMoxO6 nanomaterials. The results are compared to related in situ studies on hierarchically structured W/Mo oxides.

Abstract

Bi2WO6 has attracted considerable interest as a visible-lightdriven photocatalyst with a layered Aurivillius structure. The catalytic performance of bismuth tungstate is notably enhanced through the partial substitution of tungsten with molybdenum. Whereas hydrothermally obtained Bi2W1-xMoxO6 solid solutions maintain the Bi2WO6 structure, their morphologies vary with the molybdenum content. Lower Mo contents (x < 0.5) favor the formation of hierarchically nanostructured microspheres that consist of sheet-like building blocks. Their disintegration is observed for greater extents of W/Mo substitution, hand in hand with a decrease in the surface area. Raman spectra furthermore indicate changes in the local structure of the octahedral W/Mo moieties upon variation of the Mo content. As little is known about the growth kinetics and hydrothermal formation processes of nanostructured Bi2W1-xMoxO6 catalysts, in situ XAS investigations were performed to determine the onset of their hydrothermal formation from Bi(NO3)(3)center dot 5H(2)O, K2WO4 and Na2MoO4. In situ energy- dispersive X-ray diffraction (EDXRD) experiments revealed a correlation between particle shape, Mo content and formation pathway of the Bi2W1-xMoxO6 nanomaterials. The results are compared to related in situ studies on hierarchically structured W/Mo oxides.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
Dewey Decimal Classification:540 Chemistry
Language:English
Date:2012
Deposited On:05 Mar 2013 11:56
Last Modified:17 May 2017 07:05
Publisher:Wiley-Blackwell
ISSN:1434-1948
Publisher DOI:https://doi.org/10.1002/ejic.201101116

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