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Journal of Materials Science

, Volume 41, Issue 23, pp 8001–8012 | Cite as

Structural, photophysical and photocatalytic properties of Bi2MTaO7 (M = La and Y)

  • Jing-Fei Luan
  • Xi-Ping Hao
  • Shou-Rong Zheng
  • Guo-You Luan
  • Xiao-Shan Wu
Article

Abstract

Bi2MTaO7 (M = Y and La) were synthesized by solid-state reaction method and their structural and photocatalytic properties were investigated. The results indicated that these compounds crystallize in the pyrochlore-type structure, cubic system with space group Fd-3 m. In addition, the band gaps of Bi2LaTaO7 and Bi2YTaO7 were estimated to be about 2.17(3) and 2.22(7) eV, respectively. For the photocatalytic water splitting reaction, H2 or O2 evolution was observed from pure water respectively with Bi2MTaO7 (M = Y and La) as the photocatalysts under ultraviolet light irradiation. Photocatalytic degradation of aqueous methylene blue (MB) dye over these compounds was further investigated under visible light irradiation. Bi2MTaO7 (M = Y and La) showed markedly higher catalytic activity compared to P-25 for MB photocatalytic degradation under visible light irradiation. Complete removal of aqueous MB was observed after visible light irradiation for 190 min with Bi2LaTaO7 as the photocatalyst and for 200 min with Bi2YTaO7 as the photocatalyst. The decrease of the total organic carbon (TOC) and the formation of inorganic products, SO 4 2− and NO 3 , demonstrated the continuous mineralization of aqueous MB during the photocatalytic process.

Keywords

Methylene Blue Total Organic Carbon Photocatalytic Activity Visible Light Irradiation Photocatalytic Property 

Notes

Acknowledgement

This work was supported by a grant from the Natural Science Foundation of Jiangsu Province (No. BK2006130).

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Copyright information

© Springer Science+Business Media, LLC 2006

Authors and Affiliations

  • Jing-Fei Luan
    • 1
  • Xi-Ping Hao
    • 2
  • Shou-Rong Zheng
    • 3
  • Guo-You Luan
    • 4
  • Xiao-Shan Wu
    • 5
  1. 1.State Key Laboratory of Pollution Control and Resource Reuse, School of EnvironmentNanjing UniversityNanjing People’s Republic of China
  2. 2.Department of Materials Science and Engineering,National Laboratory of Solid State MicrostructuresNanjing UniversityNanjing People’s Republic of China
  3. 3.State Key Laboratory of Pollution Control and Resource Reuse, School of EnvironmentNanjing UniversityNanjingPeople’s Republic of China
  4. 4.State Key Laboratory of Catalysis, Dalian Institute of Chemical PhysicsChinese Academy of SciencesDalian People’s Republic of China
  5. 5.National Laboratory of Solid State MicrostructuresNanjing UniversityNanjing People’s Republic of China

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