Synthesis and Visible-light Photocatalytic Activities of Bi2Sn2O7

doi:10.15541/jim20140236

Abstract

Abstract:

Bi₂Sn₂O₇ photocatalysts with rods and microspheres composed of particles were successfully synthesized via a facile hydrothermal route. Adding order change of the raw materials resulted in different forms of nucleation, thus affected the final morphology of the products. The as-prepared Bi₂Sn₂O₇ was a special kind of complex oxide with pyrochlore structure, which possessed visible photocatalytic performance with the band gap of 2.61 eV. Photocatalytic activities of the products were evaluated by degradation of RhB under visible light. Bi₂Sn₂O₇ exhibited high Photocatalytic activities with degradation rate of 98% within 100 min. Particularly, microsphere shaped Bi₂Sn₂O₇ composed of particles possessed higher photocatalytic activities. Under condition of different free radicals quenchers, ·O₂^- and h⁺ were recognized as primary active species responsible for RhB degradation.

Key words: Bi2Sn2O7, visible light, hydrothermal synthesis, photocatalysis

CLC Number:

O643

GAO Er-Ping, WANG Wen-Zhong. Synthesis and Visible-light Photocatalytic Activities of Bi₂Sn₂O₇[J]. Journal of Inorganic Materials, 2015, 30(1): 87-92.

Figures/Tables 6

Fig. 1 XRD patterns of as-prepared Bi2Sn2O7-particle and Bi2Sn2O7-rod samples

Fig. 2 UV-visible diffuse reflectance spectra of γ-Bi2Sn2O7 products. Inset: plots of (αhυ)2 versus photon energy (hυ)

Fig. 3 SEM images of Bi2Sn2O7-rod samples (a and b) and Bi2Sn2O7-particle samples (c and d)

Fig. 4 Photocatalytic degradation of RhB as a function of irradiation time by different photocatalysts

Fig. 5 Effect of different scavengers on the photocatalytic degradation of RhB

Fig. 6 Schematic structure of Bi2Sn2O7 (a), diagrammatic representation of Bi3+ cation environments (b), coordination environment around Bi atom (c) and coordination environment around Sn atom (d)

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Synthesis and Visible-light Photocatalytic Activities of Bi₂Sn₂O₇

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