球形、花形和线状钒酸铋的可控合成及光催化性能

doi:10.3866/PKU.WHXB201305131

Abstract

Abstract:

Spherical, flowerlike, and threadlike bismuth vanadates (BiVO₄) were synthesized via a controllable hydrothermal method without using any surfactant or template. The optical and photocatalytic properties of the BiVO₄ samples were investigated. The phase structures of the BiVO₄ samples were observed by X-ray diffraction (XRD), which indicated that the as-prepared samples possessed monoclinic cells. Transmission electron microscope (TEM) observations showed that BiVO₄ crystals with different morphologies were fabricated simply by manipulating the parameters of the hydrothermal reaction. On the basis of the structural analysis of samples obtained under different conditions, a possible mechanism for the formation of these distinct morphologies was proposed. UV-visible diffuse reflectance spectra (UV-Vis DRS) of the samples revealed that the band gaps of the BiVO₄ photocatalysts were about 2.19-2.33 eV. The as-prepared BiVO₄ photocatalysts exhibited higher photocatalytic activities toward the degradation of rhodamine B (RhB) under visible light irradiation (λ>420 nm) than commercial P25 TiO₂ and traditional N-doped TiO₂ (N-TiO₂). Spherical BiVO₄ showed the highest photocatalytic activity of the samples, decolorizing up to 100% of RhB upon visible light irradiation for 180 min. The reason for the different photocatalytic activities of the BiVO₄ samples fabricated at different pH was systematically studied by considering their structure and morphology.

Key words: BiVO₄, Microsphere, Microflower, Microwire, Controllable synthesis, Photocatalytic degradation

LIN Xue, YU Li-Li, Yan Li-Na, GUAN Qing-Feng, Yan Yong-Sheng, ZHAO Han. Controllable Synthesis and Photocatalytic Activity of Spherical, Flowerlike and Threadlike Bismuth Vanadates[J]. Acta Phys. -Chim. Sin. 2013, 29(08), 1771-1777. doi: 10.3866/PKU.WHXB201305131

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Controllable Synthesis and Photocatalytic Activity of Spherical, Flowerlike and Threadlike Bismuth Vanadates

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