Ren, Lu and Ma, Lili and Jin, Lei and Wang, Jian-Bo and Qiu, Mingqiang and Yu, Ying (2009) Template-free synthesis of BiVO 4 nanostructures: II. Relationship between various microstructures for monoclinic BiVO 4 and their photocatalytic activity for the degradation of rhodamine B under visible light. Nanotechnology, 20 (40). p. 405602.
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Official URL: http://stacks.iop.org/0957-4484/20/i=40/a=405602
The shape-controlled synthesis of nanostructured materials has opened up new possibilities to improve their physical and chemical properties. In this work, new types of monoclinic structured BiVO 4 with complex morphologies, namely flowerlike, disclike, tubelike and platelike shapes, have been synthesized in a binary green solvent (water and ethanol) through controlling reaction conditions such as solvent, pH value, concentration of precursors and reaction temperature. The morphology of BiVO 4 can transform from three-dimensional (3D) flowerlike superstructures and hexagonal-prismatic nanotubes to two-dimensional (2D) platelike and disclike structures. UVâvis absorption spectra show that all of the prepared nano- and microstructures can respond to visible light and the optical properties of BiVO 4 samples are relevant to their structures. More importantly, the photocatalytic activities of various BiVO 4 samples are strongly dependent on their morphology for the degradation of rhodamine B (RhB) under visible-light irradiation. The 2D (disclike and platelike) BiVO 4 demonstrates better photocatalytic activity than 3D and bulk BiVO 4 . Among the nano- and microstructures, the nanoplate BiVO 4 exhibit the highest photocatalytic activity for degradation of organic pollutants. Additionally, it is found that the different microstructure of BiVO 4 leads to the different degradation route for organic compounds of RhB. The reasons for the differences in the photocatalytic behavior for these BiVO 4 nanostructures are further discussed. The relationship between the microstructure and the photocatalytic activity for BiVO 4 may give clues for the preparation of photocatalysts with high activity based on material morphology design. Moreover, the prepared 2D BiVO 4 can be a good photocatalyst used in environmental pollution control.
|Deposited By:||Prof. Alexey Ivanov|
|Deposited On:||01 Nov 2011 23:35|
|Last Modified:||02 Nov 2011 00:47|
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