Effect of multi-walled carbon nanotubes loaded with Ag nanoparticles on the photocatalytic degradation of rhodamine B under visible light irradiation

▶ The visible light photocatalytic activity of Ag/MWNTs was explored. ▶ Electrochemical impedance spectroscopy (EIS) was applied to characterize the electron transfer rate of Ag/MWNTs. ▶ Ag/MWNTs was found to be an ideal alternative to Pt/MWNTs for the rhodamine B degradation due to its low cost and...

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Bibliographic Details
Published in:Applied surface science 2011-02, Vol.257 (8), p.3620-3626
Main Authors: Yan, Ya, Sun, Huiping, Yao, Pingping, Kang, Shi-Zhao, Mu, Jin
Format: Article
Language:English
Subjects:
Adsorption
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Degradation
Exact sciences and technology
Light irradiation
Multi wall carbon nanotubes
Multi-walled carbon nanotubes
Nanoparticles
Photocatalysis
Physics
Rhodamine
Rhodamine B
Silver
Surface chemistry
Visible light photocatalysis
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Summary:▶ The visible light photocatalytic activity of Ag/MWNTs was explored. ▶ Electrochemical impedance spectroscopy (EIS) was applied to characterize the electron transfer rate of Ag/MWNTs. ▶ Ag/MWNTs was found to be an ideal alternative to Pt/MWNTs for the rhodamine B degradation due to its low cost and high visible light photocatalytic activity. Multi-walled carbon nanotubes loaded with Ag nanoparticles (Ag/MWNTs) were prepared by two methods (direct photoreduction and thermal decomposition). The photocatalytic activity of Ag/MWNTs for the degradation of rhodamine B (RhB) under visible light irradiation was investigated in detail. The adsorption and photocatalytic activity tests indicated that the MWNTs served as both an adsorbent and a visible light photocatalyst. The photocatalytic activity of MWNTs was remarkably enhanced when the Ag nanoparticles were loaded on the surface of MWNTs. Moreover, the visible light photocatalytic activity of Ag/MWNTs depended on the synthetic route. On the basis of the experimental results, a possible visible light photocatalytic degradation mechanism was discussed.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2010.11.089