Bi2MoO6/BiVO4异质结的水热合成和可见光催化活性

doi:10.3866/PKU.WHXB201409052

Abstract

Abstract:

A Bi₂MoO₆/BiVO₄ photocatalyst with a heterojunction structure was synthesized by a one-pot hydrothermal method. Its crystal structure and microstructure were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), and high-resolution transmission electron microscopy (HRTEM). The FESEM and HRTEM images indicated that Bi₂MoO₆ nanoparticles were loaded on the surface of BiVO₄ nanoplates to form a heterojunction. The ultraviolet visible (UV-Vis) diffuse reflection spectra (DRS) showed that the resulting Bi₂MoO₆/BiVO₄ heterojunction possessed more intensive absorption within the visible light range compared with pure Bi₂MoO₆ and BiVO₄. These excellent structural and spectral properties endowed the Bi₂MoO₆/BiVO₄ heterojunction with enhanced photocatalytic activity. It was found that the Rhodamine B (RhB) degradation rate with Bi₂MoO₆/BiVO₄ was higher than that with pure BiVO₄ and Bi₂MoO₆ under visible light (λ>420 nm) by photocatalytic measurements. The enhanced photocatalytic performance of the Bi₂MoO₆/BiVO₄ sample can be attributed to the improved separation efficiency of photogenerated hole-electron pairs generated by the heterojunction between Bi₂MoO₆ and BiVO₄, intensive absorption within the visible light range, and high specific surface area.

Key words: Bi₂MoO₆/BiVO₄, Composite material, Nanostructure, Photocatalytic activity

LIN Xue, GUO Xiao-Yu, WANG Qing-Wei, CHANG Li-Min, ZHAI Hong-Ju. Hydrothermal Synthesis and Efficient Visible Light Photocatalytic Activity of Bi₂MoO₆/BiVO₄ Heterojunction[J]. Acta Phys. -Chim. Sin. 2014, 30(11), 2113-2120. doi: 10.3866/PKU.WHXB201409052

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Hydrothermal Synthesis and Efficient Visible Light Photocatalytic Activity of Bi₂MoO₆/BiVO₄ Heterojunction

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Hydrothermal Synthesis and Efficient Visible Light Photocatalytic Activity of Bi₂MoO₆/BiVO₄ Heterojunction