Photocatalytic degradation mechanisms of CeO2/Tb2O3 nanotubes

•CeO2/Tb2O3 nanotubes have been synthesized using the surfactant free co-precipitation method.•HRTEM images, XPS spectra, and EDAX profiles showed that the as-synthesized samples were CeO2/Tb2O3 nanotubes.•Photocatalytic activity of the synthesized catalysts was evaluated by degrading Methylene blue...

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Bibliographic Details
Published in:Applied surface science 2015-09, Vol.349, p.459-464
Main Authors: Arul, Narayanasamy Sabari, Mangalaraj, Devanesan, Kim, Tae Whan
Format: Article
Language:English
Subjects:
CeO2/Tb2O3
Coprecipitation
Degradation
Fittings
Methylene Blue
Nanotubes
Photocatalysis
Photocatalyst
Photodegradation
Transmission electron microscopy
X-ray photoelectron spectroscopy
X-rays
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Summary:•CeO2/Tb2O3 nanotubes have been synthesized using the surfactant free co-precipitation method.•HRTEM images, XPS spectra, and EDAX profiles showed that the as-synthesized samples were CeO2/Tb2O3 nanotubes.•Photocatalytic activity of the synthesized catalysts was evaluated by degrading Methylene blue under visible light irradiation.•Estimated rate constants for the CeO2 nanoparticles and the CeO2/Tb2O3 nanotubes were 0.0134 and 0.0317min−1, respectively.•Photodegradation efficiency of CeO2/Tb2O3 nanotubes was 93% after 75min. CeO2/Tb2O3 nanotubes (NTs) have been synthesized using the surfactant free co-precipitation method. High resolution transmission electron microscopy (HRTEM) images, X-ray spectroscopy (XPS) spectra, and energy dispersive X-ray (EDAX) profiles showed that the as-synthesized samples were CeO2/Tb2O3 NTs. The photocatalytic activity of the synthesized catalysts was evaluated by degrading Methylene blue (MB) under visible light irradiation. The fitting of the absorbance maximum as a function of time showed that the photodegradation of the MB followed pseudo-first-order reaction kinetics. The estimated rate constants for the CeO2 NPs and the CeO2/Tb2O3 NTs were found to be 0.0134 and 0.0317min−1, respectively. The photodegradation efficiency of CeO2/Tb2O3 nanotubes was 93% after 75min, which was found to be higher than those of CeO2 NPs (66%).
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2015.04.206