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Substitution Effect of Ta5+ by Nb5+ on Photocatalytic, Photophysical, and Structural Properties of BiTa1–xNbxO4(0 ≦ x≦ 1.0)

Published online by Cambridge University Press:  31 January 2011

Zhigang Zou ,
Hironori Arakawa  and
Jinhua Ye
Zhigang Zou*
Affiliation:
Photoreaction Control Research Center (PCRC), National Institute of Advanced Industrial Science and Technology (AIST), 1–1-1 Higashi, Tsukuba, Ibaraki 305–8563, Japan
Hironori Arakawa
Affiliation:
Photoreaction Control Research Center (PCRC), National Institute of Advanced Industrial Science and Technology (AIST), 1–1-1 Higashi, Tsukuba, Ibaraki 305–8563, Japan
Jinhua Ye
Affiliation:
Materials Engineering Laboratory (MEL), National Institute for Materials Science (NIMS), 1–2-1 Sengen, Tsukuba, Ibaraki 305–0047, Japan
*
a)Address all correspondence to this author. e-mail: z.zou@aist.go.jp
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Abstract

Substitution effects of Ta5+ by Nb5+ in BiTa1−xNbxO4(0 ≦ x ≧ 1.0) on photocatalytic, photophysical, and structural properties were investigated. The powder x-ray diffraction and Rietveld structural refinement showed that the structure of BiTa1−xNbxO4 at R = Nb/Bi = 0.0 and 0.5 is a triclinic system with space group P1. However, the structure at R = 0.2, 0.8, and 1.0 is an orthorhombic system with space group Pnna. Ultraviolet-visible diffuse reflectance spectroscopy measurement revealed that the band gap of orthorhombic samples is narrower than that of triclinic compounds. The H2 evolution was obtained from an aqueous CH3OH/H2O solution and pure H2O with BiTa1−xNbxO4 under ultraviolet irradiation. The orthorhombic samples exhibit much higher activity than that of triclinic compounds. The orthorhombic compound at R = 0.2 showed the highest activity, which is higher than that of the well-known TiO2 photocatalyst.

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Articles
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Journal of Materials Research , Volume 17 , Issue 6 , June 2002 , pp. 1446 - 1454
Copyright
Copyright © Materials Research Society 2002

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