Enhanced photocatalytic performance of boron doped Bi2WO6 nanosheets under simulated solar light irradiation

•Boron was doped into Bi2WO6 using hydrothermal method.•Doping with boron enhanced the photoactivity of Bi2WO6 to rhodamine B under simulated solar light.•The catalyst doped with 0.5% boron atoms displayed the highest catalytic activity.•Boron atoms could act as electron traps to separate the electr...

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Bibliographic Details
Published in:Journal of hazardous materials 2013-06, Vol.254-255, p.185-192
Main Authors: Fu, Yu, Chang, Chun, Chen, Peng, Chu, Xiaolong, Zhu, Lingyan
Format: Article
Language:English
Subjects:
Aliivibrio fischeri - drug effects
Aliivibrio fischeri - metabolism
Bi2WO6
Bismuth - chemistry
Bismuth - radiation effects
Boron
Boron - chemistry
Catalysis
Catalytic activity
Degradation
Fluorescent Dyes - chemistry
Fluorescent Dyes - toxicity
Luminescence
Nanosheet
Nanostructures - chemistry
Nanostructures - radiation effects
Oxides - chemistry
Oxides - radiation effects
Photocatalysis
Photocatalytic
Photodegradation
Photolysis
Porosity
Rhodamine B (RhB)
Rhodamines - chemistry
Rhodamines - toxicity
Simulated solar light
Simulation
Sunlight
Tungsten - chemistry
Tungsten - radiation effects
Water Pollutants, Chemical - chemistry
Water Pollutants, Chemical - toxicity
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Summary:•Boron was doped into Bi2WO6 using hydrothermal method.•Doping with boron enhanced the photoactivity of Bi2WO6 to rhodamine B under simulated solar light.•The catalyst doped with 0.5% boron atoms displayed the highest catalytic activity.•Boron atoms could act as electron traps to separate the electron–hole pairs. Bi2WO6 doped with different amounts of boron atoms (0.1, 0.5, 1.0, 5.0 and 10% B) were synthesized using hydrothermal method and their photocatalytic activities to degrade rhodamine B (RhB) under simulated solar light was investigated. The successful incorporation of B atoms in Bi2WO6 was proved by FT-IR, Raman spectra and XPS. Doping with B could affect the pore structure and volume. 0.5% B/Bi2WO6 displayed more mesopores with higher total pore volume than pure Bi2WO6; while the pores of 10% B/Bi2WO6 mainly distributed in microporous range with much less total pore volume. As a result, 0.5% B/Bi2WO6 displayed stronger adsorption capacity to RhB, favoring the photodegradation. In addition, the doped B atoms could act as electron traps and facilitate the separation of photogenerated electron–hole pairs due to its electron deficient and oxytropic characteristics. 0.5% B/Bi2WO6 displayed the highest photocatalytic activity under simulated solar light with rate constant (kobs) 8.8 times of that using pure Bi2WO6. Its photoactivity was affected by solution pH and the optimum was achieved at pH 7. At this condition, around 100% of RhB (10−5mol/L) was degraded in 180min. The photogenerated holes were the main active species responsible for the photodegradation of RhB by B/Bi2WO6.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2013.03.046