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HomeAdvanced Materials ResearchAdvanced Materials Research Vols. 807-809Plasmon-Induced Photodegradation of Toxic...

Plasmon-Induced Photodegradation of Toxic Pollutants with Ag/AgI/Bi₂WO₆under Visible-Light Irradiation

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Abstract:

The Ag/AgI/Bi₂WO₆ photocatalysts were successfully synthesized by deposition-precipitation and photoreduction methods. The catalyst showed high and stable photocatalytic activity for the degradation of the RhB under visible light irradiation (λ>400 nm). On the basis of a new plasmonic photocatalytic mechanism, the photogenerated electron-hole pairs are formed in Ag nanoparticles (NPs) due to surface plasmon resonance under visible-light irradiation. Then, the photoexcited electrons at the Ag NPs are injected into AgI. On the other hand, the band position shows that AgI and Bi₂WO₆ have the matching band potentials in the AgI/Bi₂WO₆ heterostructure composites. So the photoexcited electrons is ultimately transfer to the Bi₂WO₆ conduction band (CB), photo-induced holes (h_VB⁺) is transfer to the AgI valence band (VB) and the simultaneous transfer to compensative electrons from I^- to the Ag NP_S. This the result indicates that the high photosensitivity of noble metal Ag NPs due to surface plasmon resonance, which is not only improve the photocatalytic performance, but also offer a new idea for preparation of new photocatalysts .

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Periodical:

Advanced Materials Research (Volumes 807-809)

Pages:

1534-1542

DOI:

https://doi.org/10.4028/www.scientific.net/AMR.807-809.1534

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Online since:

September 2013

Authors:

Ming Sheng Gui*, Peng Fei Wang, Miao Miao Tang, Dong Yuan

Keywords:

Ag, AGI, Bi₂WO₆, Photocatalysis, Plasmon

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© 2013 Trans Tech Publications Ltd. All Rights Reserved

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