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Photocatalytic degradation mechanisms of CeO2/Tb2O3 nanotubes
- Issue Date
- Sep-2015
- Publisher
- ELSEVIER SCIENCE BV
- Keywords
- CeO2/Tb2O3; Nanotubes; Transmission electron microscopy; Methylene Blue; Photocatalyst
- Citation
- APPLIED SURFACE SCIENCE, v.349, pp.459 - 464
- Indexed
- SCIE
SCOPUS
- Journal Title
- APPLIED SURFACE SCIENCE
- Volume
- 349
- Start Page
- 459
- End Page
- 464
- ISSN
- 0169-4332
- Abstract
- 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 0.0317 min(-1), respectively. The photodegradation efficiency of CeO2/Tb2O3 nanotubes was 93% after 75 min, which was found to be higher than those of CeO2 NPs (66%).
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