Nanosheet-based Bi2MoxW1- xO6 solid solutions with adjustable band gaps and enhanced visible-light-driven photocatalytic activities

Zhou, Liang, Yu, Minmin, Yang, Jie, Wang, Yunhua and Yu, Chengzhong (2010) Nanosheet-based Bi2MoxW1- xO6 solid solutions with adjustable band gaps and enhanced visible-light-driven photocatalytic activities. The Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter, 114 44: 18812-18818. doi:10.1021/jp107061p


Author Zhou, Liang
Yu, Minmin
Yang, Jie
Wang, Yunhua
Yu, Chengzhong
Title Nanosheet-based Bi2MoxW1- xO6 solid solutions with adjustable band gaps and enhanced visible-light-driven photocatalytic activities
Formatted title
Nanosheet-based Bi2MoxW1- xO6 solid solutions with adjustable band gaps and enhanced visible-light-driven photocatalytic activities
Journal name The Journal of Physical Chemistry Part C: Nanomaterials, Interfaces and Hard Matter   Check publisher's open access policy
ISSN 1932-7447
1932-7455
Publication date 2010-11-11
Sub-type Article (original research)
DOI 10.1021/jp107061p
Volume 114
Issue 44
Start page 18812
End page 18818
Total pages 7
Place of publication Washington, DC, U.S.A.
Publisher American Chemical Society
Collection year 2011
Language eng
Formatted abstract
Bi2MoxW1-xO6 solid solutions with various compositions (x = 0, 0.25, 0.50, 0.75, and 1.00) have been synthesized by a facile hydrothermal crystallization method. All the as-synthesized products are composed of nanosheets with similar orthorhombic Aurivillius layered structures. With decreasing Mo content, the thickness of the nanosheets decreases. The nanosheets begin to intergrow at x = 0.75 and further assemble into hierarchical superstructures through "oriented attachmenta" with even less Mo content. For the Bi2Mo xW1-xO6 solid solutions with x = 0.25, 0.50, and 0.75, the valence band is widened and the conduction band is elevated when compared with the most intensively studied Bi2WO6 photocatalyst. As a result, the Bi2MoxW 1-xO6 solid solutions (x = 0.25, 0.50, and 0.75) show narrowed band gaps of ~2.69 eV when compared with Bi2WO6 (2.94 eV) and Bi2MoO6 (2.72 eV). The photocatalytic activities of the as-prepared products have been evaluated using the photodecomposition of methylene blue under visible light irradiation as a model reaction. The sample, Bi2Mo0.25W0.75O 6, exhibits the highest photocatalytic activity. The intrinsic layered structure, nanosheet morphology, manipulated band structure and band gap, and the W content play important roles in the photocatalytic activity. Our approach provides a facile technique to tune both the nanostructure and the band gap of photocatalysts by simply adjusting the composition of the solid solutions, leading to photocatalysts with enhanced visible light photocatalytic activity. This method may be further extended to the designed synthesis of novel and highly efficient visible-light-driven semiconductors for environmental remediation.
© 2010 American Chemical Society.
Keyword Flake-ball particles
Titanium dioxide
Photphysical properties
Hydrothermal properties
Irradiation
Water
TIO2
Decomposition
Oxide
Photoactivity
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Chemical Engineering Publications
Official 2011 Collection
 
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Created: Sun, 05 Dec 2010, 10:10:33 EST