Sol–gel synthesis and enhanced photocatalytic activity of doped bismuth tungsten oxide composite

Journal Article · Fri Jan 15 00:00:00 EST 2016 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2015.09.024· OSTI ID:22584277

Xu, Xuetang; Ge, Yuanxing ^[1]; Wang, Hong ^[2]; Li, Bin ^[1]; Yu, Liuhui; Liang, Yanyan; Chen, Kun ^[2]; Wang, Fan ^[2]

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1. Guangxi Key Laboratory of Petrochemical Resource Processing and Process Intensification Technology, School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004 (China)
2. School of Chemistry and Chemical Engineering, Guangxi University, Nanning 530004 (China)

Highlights: • Co dopant results in the phase change from Bi{sub 2}WO{sub 6} to Bi{sub 2}WO{sub 6}/Bi{sub 14}W{sub 2}O{sub 27} heterostructure. • Enhanced photocatalytic activity of Bi{sub 2}WO{sub 6}/Bi{sub 14}W{sub 2}O{sub 27} heterostructure. • Synergistic effects coming from the interactions between Bi{sub 14}W{sub 2}O{sub 27} and Bi{sub 2}WO{sub 6} - Abstract: Pristine Bi{sub 2}WO{sub 6} and Bi{sub 2}WO{sub 6}/Bi{sub 14}W{sub 2}O{sub 27} photocatalysts were synthesized by sol–gel method using Co(II) cation as dopant. The influence of Co dopant to the formation of Bi{sub 2}WO{sub 6}/Bi{sub 14}W{sub 2}O{sub 27} heterostructure composite was discussed. The photocatalytic activities of as-prepared samples were evaluated sufficiently by using rhodamine B as target organic pollutants under visible light. The as-prepared Bi{sub 2}WO{sub 6}/Bi{sub 14}W{sub 2}O{sub 27} heterostructure achieved enhanced optical absorption in the visible-light region, and exhibited much higher photocatalytic activities than that of pristine Bi{sub 2}WO{sub 6}. The optimum Bi/Co molar ratio and calcining temperature were also explored. The enhanced activities were attributed to the formation of heterostructure in suppressing the recombination of photo-generated carriers. The Co dopant species would participate to reduce the charge carrier recombination by acting as trapping sites for photogenerated charges. A possible photocatalytic mechanism over Bi{sub 2}WO{sub 6}/Bi{sub 14}W{sub 2}O{sub 27} heterostructure was proposed.

• OSTI ID: 22584277
• Journal Information: Materials Research Bulletin, Vol. 73; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION
BISMUTH TUNGSTATES
CHARGE CARRIERS
COMPOSITE MATERIALS
DOPED MATERIALS
HETEROJUNCTIONS
INTERFACES
PHOTOCATALYSIS
POLLUTANTS
RECOMBINATION
RHODAMINES
SOL-GEL PROCESS
SYNTHESIS
TUNGSTEN
TUNGSTEN OXIDES
VISIBLE RADIATION