Photodegradation of C.I. Reactive Red 2 in the Bi sub(2)WO sub(6) system: the determination of surface characteristics and photocatalytic activities of Bi sub(2)WO sub(6)

In this study, Bi sub(2)WO sub(6) was synthesized by the one-step ethylene glycol (EG)-assisted solvothermal method. The effects of the amount of EG, heating time and temperature in the solvothermal method were elucidated. The surface characteristics of the prepared Bi sub(2)WO sub(6) were identifie...

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Bibliographic Details
Published in:Reaction kinetics, mechanisms and catalysis mechanisms and catalysis, 2016-02, Vol.117 (1), p.391-404
Main Authors: Wu, Chung-Hsin, Kuo, Chao-Yin, Wu, Jui-Tai, Hsu, Ming-Ju, Jhang, Tai-Jyun
Format: Article
Language:English
Subjects:
Catalytic activity
Heating
Photocatalysis
Photodegradation
Specific surface
Surface properties
X-rays
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Summary:In this study, Bi sub(2)WO sub(6) was synthesized by the one-step ethylene glycol (EG)-assisted solvothermal method. The effects of the amount of EG, heating time and temperature in the solvothermal method were elucidated. The surface characteristics of the prepared Bi sub(2)WO sub(6) were identified by scanning electron microscopy, transmission electron microscopy, X-ray diffraction, specific surface area analysis, UV-Vis spectrophotometry and X-ray photoelectron spectroscopy. C.I. Reactive Red 2 (RR2) was used for studying the photocatalytic activity of prepared Bi sub(2)WO sub(6). The effects of the RR2 concentration, Bi sub(2)WO sub(6) dose and pH on RR2 photodegradation were elucidated. The optimal experimental conditions for synthesizing Bi sub(2)WO sub(6) via the solvothermal method were 100 % EG as the solvent with Bi and W precursors, heated at 433 K for 12 h; the obtained product was EG70-12 h-433 K. The crystal size, specific surface area and band gap of EG70-12 h-433 K were 8.0 nm, 100.3 m super(2)/g and 3.1 eV. The rate of RR2 removal by the prepared Bi sub(2)WO sub(6) followed a pseudo-first order kinetic model and the rate constant of EG70-12 h-433 K was 3.02 h super(-1). The RR2 photodegradation rate increased with the EG70-12 h-433 K dose; it fell as the RR2 concentration or pH increased. The results of adding a scavenger suggested that the photogenerated holes were the main oxidative species in RR2 photodegradation over EG70-12 h-433 K.
ISSN:1878-5190
1878-5204
DOI:10.1007/s11144-015-0944-y