Issue 41, 2012

Micro/nano-structured CaWO4/Bi2WO6 composite: synthesis, characterization and photocatalytic properties for degradation of organic contaminants

Abstract

The micro/nano-structured CaWO4/Bi2WO6 composite was successfully synthesized by a one-step hydrothermal route without using any templates or surfactants. The as-prepared samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), UV-vis diffuse reflectance spectroscopy (UV-vis DRS), Fourier transform infrared (FT-IR) spectroscopy, thermogravimetry-differential scanning calorimetry (TG-DSC) and Brunauer–Emmet–Teller (BET) theory. The results indicated that the composite has a two-phase composition: CaWO4 and Bi2WO6. The photocatalytic activities of the CaWO4/Bi2WO6 composite were evaluated for the degradation of Rhodamine B (RhB) dye and 4-nitrophenol (4-NP) in aqueous solution under visible-light irradiation (>420 nm), which were 4.5 times and 2.5 times higher than that of the pure Bi2WO6, respectively. On the basis of the calculated energy band positions, the mechanism of enhanced photocatalytic activity for the micro/nano-structured CaWO4/Bi2WO6 composite can be attributed to the effective separation of electron–hole pairs.

Graphical abstract: Micro/nano-structured CaWO4/Bi2WO6 composite: synthesis, characterization and photocatalytic properties for degradation of organic contaminants

Supplementary files

Article information

Article type
Paper
Submitted
27 Jun 2012
Accepted
16 Aug 2012
First published
17 Aug 2012

Dalton Trans., 2012,41, 12697-12703

Micro/nano-structured CaWO4/Bi2WO6 composite: synthesis, characterization and photocatalytic properties for degradation of organic contaminants

Y. Guo, G. Zhang, H. Gan and Y. Zhang, Dalton Trans., 2012, 41, 12697 DOI: 10.1039/C2DT31376F

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