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摘要
Ag@AgI/Ni thin films plasmonic photocatalyst were prepared by electrochemical method. The surface morphology, phase structure, optical characteristics and band structure of the thin film were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and ultraviolet-visible diffuse reflectance spectroscopy (UV-Vis DRS), respectively. Its photocatalytic properties and stability were evaluated with rhodamine B(RhB) as a model compound under the simulated solar irradiation. Using a method of adding active species scavenger to the solution, mechanism of photocatalytic degradation of the films was explored. The Ag@AgI/Ni thin films prepared under the optimized preparation conditions are composed of AgI micron-sized particles coated with Ag nanocrystals, which have a significant surface plasmon resonance (SPR) effect. The thin film exhibits a maximum photocatalytic activity and a superior photocatalytic stability to decompose RhB. The photodegradation rate of the Ag@AgI/Ni thin films under the simulated solar irradiation 60 min (i.e., 81.1%) is 1.35 times greater than that of AgI/Ni thin film, and 1.61 times greater than that of P25TiO(2)/ITO thin film. The photocatalytic activity almost keeps unchanged after five recycled experiments. The improvement in photocatalytic activity for Ag@AgI/Ni thin film can be mainly attributed to the activation of nano Ag particles on the film for photocathode reaction with a significant SPR effects. In addition, the photodegradation mechanism of the films for RhB under the simulated solar irradiation was also discussed.
- 出版日期2017-12-10
- 单位廊坊师范学院
