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Appl. Sci. 2018, 8(2), 216; https://doi.org/10.3390/app8020216

Flower-like BiVO4 Microspheres and Their Visible Light-Driven Photocatalytic Activity

1
Graduate School of Engineering, Shibaura Institute of Technology, Saitama 337-8570, Japan
2
Department of Machinery and Control Systems, Shibaura Institute of Technology, Saitama 337-8570, Japan
*
Author to whom correspondence should be addressed.
Received: 13 November 2017 / Revised: 21 January 2018 / Accepted: 22 January 2018 / Published: 31 January 2018
(This article belongs to the Special Issue Nanotechnology in Wastewater Treatment Technology)
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Abstract

A flower-like BiVO4 microsphere photocatalyst was synthesized with a simple template-free homogeneous precipitation method at 60 °C for 24 h. The purpose of this study is to explore a low-cost, simple method of synthesizing the self-assembled 3D structure in order to enhance photocatalytic performance under visible light irradiation (λ > 420 nm). In this study, the morphology, structure, and photo-absorption of flower-like BiVO4 microspheres were characterized, and the effects of photocatalysis were analyzed. The results indicate that the size of the flower-like microspheres was about 2 μm to 4 μm and they were composed of several nanosheets. The mechanism of hierarchical microsphere formation has been proposed as the Ostwald ripening process and the self-assembled process. The obtained samples were calcined under different temperatures (300 °C, 400 °C, 500 °C and 600 °C) to study the effects of calcination on the structure and on photocatalysis. The photocatalytic process was then evaluated by decolorization of methylene blue dye under visible-light irradiation. View Full-Text
Keywords: bismuth vanadate; low-cost method; methylene blue dye; microspheres; photocatalyst; visible light bismuth vanadate; low-cost method; methylene blue dye; microspheres; photocatalyst; visible light
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Zulkifili, A.N.; Fujiki, A.; Kimijima, S. Flower-like BiVO4 Microspheres and Their Visible Light-Driven Photocatalytic Activity. Appl. Sci. 2018, 8, 216.

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