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SOLAR ENERGY R&D IN ASIA

A Simple Preparation Method of Visible-Light-Driven $BiVO4$ Photocatalysts From Oxide Starting Materials ($Bi2O3$ and $V2O5$) and Their Photocatalytic Activities

[+] Author and Article Information
Akihide Iwase

Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan

Hideki Kato1

Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japan

Akihiko Kudo

Department of Applied Chemistry, Faculty of Science, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo 162-8601, Japana-kudo@rs.kagu.tus.ac.jp

1

J. Sol. Energy Eng 132(2), 021106 (May 18, 2010) (5 pages) doi:10.1115/1.4001172 History: Received February 28, 2009; Revised June 22, 2009; Published May 18, 2010

Abstract

$BiVO4$ powder was easily prepared from $Bi2O3$ and $V2O5$ in an aqueous nitric acid solution at room temperature. The obtained crystal structure depended on the molar ratio of $Bi2O3$ to $V2O5$, which is the concentration and volume of an aqueous nitric acid solution. $BiVO4$ with monoclinic scheelite structure formed using starting materials, in which the molar ratio of $Bi2O3$ to $V2O5$ was 1:1. When the molar ratio was 4:3, $BiVO4$ with tetragonal zircon structure was obtained. Although $BiVO4$ with monoclinic scheelite structure was platelike particles reflecting the crystal structure, the thickness of the particle increased with an increase in the concentration of an aqueous nitric acid solution. The obtained $BiVO4$ with monoclinic scheelite structure showed good photocatalytic performances for $O2$ evolution and methylene blue degradation under visible-light irradiation.

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Figures

Figure 1

XRD patterns of BiVO4 prepared by stirring Bi2O3 and V2O5 for (a) 24 h, (b) 30 h, and (c) 48 h in 0.5 mol L−1 of an aqueous nitric acid solution, for (d) 6 h, (e) 12 h, and (f) 24 h in 0.75 mol L−1 of an aqueous nitric acid solution, and for (g) 6 h and (h) 12 h in 1 mol L−1 of an aqueous nitric acid solution. Circles and triangles indicate the peaks of BiVO4 with monoclinic scheelite and tetragonal zircon structures, respectively.

Figure 2

Raman spectra of BiVO4 prepared by stirring Bi2O3 and V2O5 for (a) 6 h, (b) 12 h, (c) 18 h, (d) 24 h, and (e) 48 h in 0.5 mol L−1 of an aqueous nitric acid solution. A semiconductor laser was used as an excitation source (785.542 nm).

Figure 3

(A) XRD patterns and (B) SEM photograph of BiVO4 with tetragonal zircon structure prepared by stirring Bi2O3 (5 mmol) and V2O5 (3.75 mmol) in 0.5 mol L−1 of an aqueous nitric solution. The XRD pattern (A)(b) is the reference of BiVO4 with tetragonal zircon structure (PDF: 14–133).

Figure 4

SEM photographs of BiVO4 prepared at different nitric acid concentrations: (a) 0.5 mol L−1; 48 h, (b) 0.75 mol L−1; 48 h, and (c) 1 mol L−1; 12 h

Figure 5

(A)(a) Diffuse reflectance spectrum of BiVO4(0.5,48,50,1:1) and (b) absorption spectrum of MB; (B) photocatalytic MB degradation in the presence (closed mark) and absence (open mark) of BiVO4 photocatalyst (0.5, 48, 50, 1:1); square: a band-pass filter (BP42), circle: a cut-off filter (R60); catalyst: 0.2 g, reactant solution: MB 50 mL, light source: 300-W Xe lamp

Figure 6

Photocatalytic MB degradation over BiVO4 under monochromatic light irradiation: (a) scheelite structure with monoclinic system (0.5. 48, 50, 1:1), (b) scheelite structure with monoclinic system (1, 12, 50, 1:1), and (c) zircon structure with tetragonal system (0.5, 48, 50, 4:3); catalyst: 0.1 g, reactant solution: MB 50 mL, light source: 300-W Xe lamp with a band-pass filter (BP42)

Figure 7

Photocatalytic MB degradation over BiVO4 under visible-light irradiation; scheelite structure with monoclinic system (0.5, 48, 50, 1:1); catalyst: 0.2 g, reactant solution: MB 50 mL, light source: 300-W Xe lamp with a cut-off filter (L42)

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