Surface plasmon resonance-induced visible-light photocatalytic performance of silver/silver molybdate composites

doi:10.1016/S1872-2067(16)62553-6

Abstract

Abstract:

Novel silver/silver molybdate (Ag/Ag₂MoO₄) composites with surface plasmon resonance (SPR)-enhanced photocatalytic performance were successfully fabricated via a facile one-pot hydrothermal route with the presence of sodium dodecyl sulfate (SDS) in this study. The as prepared silver/silver molybdate (Ag/Ag₂MoO₄) composites were systematically characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and ultraviolet-visible diffuse reflectance absorption spectroscopy (DRS) in order to investigate their crystal structure, morphology and optical property as well. The photocatalytic activities of the composites were subsequently evaluated by their ability to degrade rhodamine B (RhB) under visible-light irradiation. Varies of controlled experiments were then carefully operated to gain a deep insight into the assembling of Ag/Ag₂MoO₄ composites. It was found that preparation conditions such as pH, reaction time, and the amount of surfactant played important roles in the formation of composites with octahedral microstructures. And the composite obtained at 160℃ using 0.5 g of sodium dodecyl sulfate exhibited the highest photocatalytic performance under visible-light irradiation. Capture experiments were also conducted to clarify the function of different active species generated on the surface of Ag/Ag₂MoO₄ during the photocatalytic process, in which both holes and ·OH radicals were found to play crucial role in photocatalytic removal of RhB under visible light irradiation. A possible photocatalytic mechanism of Ag/Ag₂MoO₄ was finally proposed on the basis of all the results to explain the higher photocatalytic activity of the octahedral Ag/Ag₂MoO₄ composites. It was inferred that the photoinduced "hot" electrons can quickly transfer from the Ag NPs to the conduction band of Ag₂MoO₄ and react with oxygen and H₂O to generate a large quality of active radicals such as ·OH and ·O₂^- because of the SPR effects. Besides, this SPR effects of Ag nanoparticles deposited on the surface of Ag₂MoO₄ can not only dramatically amplify its light absorption, especially in the visible region, but also promote the separation of photoexcited electron-hole pairs and effectively decrease electron-hole recombination.

Key words: Silver, Silver molybdate, Sodium dodecyl sulfate, Photocatalytic activity, Surface plasmon resonance, Rhodamine B

Xianglong Yang, Ying Wang, Xiao Xu, Yang Qu, Xing Ding, Hao Chen. Surface plasmon resonance-induced visible-light photocatalytic performance of silver/silver molybdate composites[J]. Chinese Journal of Catalysis, 2017, 38(2): 260-269.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(16)62553-6

https://www.cjcatal.com/EN/Y2017/V38/I2/260

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