Citation: LI Ai-Chang, ZHAO Di, LU Yan-Hong, YANG Xiao-Jing, WANG Yao, LIU Jian-Xin. Preparation and Properties of Plasma Photocatalyst Ag@AgBr/CNT/Ni Thin Films[J]. Chinese Journal of Inorganic Chemistry, ;2018, 34(11): 2009-2018. doi: 10.11862/CJIC.2018.262 shu

Preparation and Properties of Plasma Photocatalyst Ag@AgBr/CNT/Ni Thin Films

Faculty of Chemistry and Material Science, Langfang Teachers College, Langfang, Heibei 065000, China

Corresponding author: LI Ai-Chang, aichangli@hotmail.com
Received Date: 31 July 2018
Revised Date: 14 September 2018

Figures(12)

Ag@AgBr/CNT/Ni thin films were prepared by composite electroplating. The surface morphology, phase structure, chemical composition and optical characteristics of the thin film were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD), Raman spectrum, X-ray photoelectron spectroscopy (XPS) 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 visible light. By measuring the electrochemical impedance spectroscopy (EIS) and adding active species trapping agents to the reaction system, the mechanism of photocatalytic degradation of the film was explored. The results show that the Ag@AgBr/CNT/Ni thin film prepared under the optimized conditions is composed of a small amount of carbon nanotubes (CNT) and AgBr crystals coated with nano-Ag particles, 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 (92.7%) of the Ag@AgBr/CNT/Ni thin film under visible light irradiation 20 min is 1.32 times greater than that of Ag@AgBr/Ni thin film, and 21.6 times greater than that of P25 TiO₂/ITO thin film. The photocatalytic activity kept mostly unchanged after five recycled experiments. The existence of CNT greatly increases the charge conductivity and the photocatalytic reduction property for dissolved oxygen of the Ag@AgBr/CNT/Ni thin film, which is the main reason for the improvement of the photocatalytic properties of the film. In addition, the photocatalytic reaction mechanism of the film for RhB under visible light irradiation was also discussed.
- Ag@AgBr/CNT/Ni thin film,
- surface plasmon resonance,
- composite electroplating,
- photocatalysis,
- reaction mechanism
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