Abstract
Incorporating plasmonic metal nanostructures into semiconductors has been regarded as an effective method to improve the photocatalytic activity for degradation of pollutants in water. In this study, a visible-light-driven photocatalyst Bi/Bi2WO6 was successfully fabricated by a simple two-step route. The samples were systematically characterized by X-ray diffraction, Raman spectroscopy, infrared spectra, field-emission scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, UV–vis diffuse reflection spectroscopy, nitrogen absorption-desorption isotherms, and photoluminescence spectroscopy. The photocatalytic performance of the Bi/Bi2WO6 composite was evaluated by the photocatalytic decomposition of Rhodamine B and 4-Chlorophenol under visible-light irradiation. The results revealed that the loaded Bi nanoparticles have great influences on the photocatalytic activity of Bi2WO6. The optimal Bi content for the photocatalytic activity of the Bi/Bi2WO6 composite was determined. Moreover, the photocatalytic mechanism of the degradation processes was thoroughly elucidated. The enhanced photocatalytic performance of the Bi/Bi2WO6 composite should be attributed to the strong visible light absorption, the surface plasmonic resonance (SPR) effect, the high migration efficiency of the electron-holes, and the interfacial interaction between Bi nanoparticles and Bi2WO6.
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