Photocatalytic activity under visible light of Fe-doped CeO2 nanoparticles synthesized by flame spray pyrolysis

CeO2 nanoparticles (undoped and Fe-doped) were synthesised using flame spray pyrolysis with varying Fe-dopant concentrations. X-ray diffraction analysis revealed the absence of any impurity phases in all samples. BET (Brunauer, Emmett and Teller) tests showed that the average sizes of undoped and Fe...

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Bibliographic Details
Published in:Ceramics international 2013-04, Vol.39 (3), p.3129-3134
Main Authors: Channei, D., Inceesungvorn, B., Wetchakun, N., Phanichphant, S., Nakaruk, A., Koshy, P., Sorrell, C.C.
Format: Article
Language:English
Subjects:
Band spectra
Carbon
D. CeO2
Flame Spray Pyrolysis
Iron
Nanoparticles
Oxalic acid
Phases
Photocatalysis
Photocatalytic Activity
Spray pyrolysis
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Summary:CeO2 nanoparticles (undoped and Fe-doped) were synthesised using flame spray pyrolysis with varying Fe-dopant concentrations. X-ray diffraction analysis revealed the absence of any impurity phases in all samples. BET (Brunauer, Emmett and Teller) tests showed that the average sizes of undoped and Fe-doped CeO2 particles were 6.39 and 5.94nm, respectively. Specific surface area of the particles increased with increasing Fe-dopant concentration. High resolution transmission electron microscopy (HRTEM) revealed that the nanoparticles were either spherical or equiaxed in shape. UV–vis spectroscopy showed a shift of the adsorption edge towards longer wavelengths along with a decrease in the optical indirect band gap from 3.18 to 2.90eV for undoped particles and 2mol% Fe-doped particles. In terms of photocatalytic performance, Fe-doped CeO2 nanoparticles were responsible for an increased degradation of the carbon from formic and oxalic acids. Furthermore, the photocatalytic efficiency was ∼100% when 2mol% Fe-doped CeO2 particles were used for testing.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2012.09.093