Eects of metal (fe3+), non-metal (N-S), and dye-sensitizer (PANI) dopants in TiO2-SiO2 thin films on methylene blue and formaldehyde degradation
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Publication Details
Author list: Kaewtip C., Jarudilokkul S., Boonamnuayvitaya V.
Publisher: Taylor and Francis Group
Publication year: 2012
Journal: Journal of Chemical Engineering of Japan (0021-9592)
Volume number: 45
Issue number: 12
Start page: 960
End page: 967
Number of pages: 8
ISSN: 0021-9592
eISSN: 1881-1299
Languages: English-Great Britain (EN-GB)
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Abstract
Transparent TiO2-SiO2 thin lms doped with single dopants, such as a metal (Fe3 ions), a non-metal (N-S), or a sensitizing dye (polyaniline, PANI), were synthesized by a modied sol-gel method combined with the peroxo titanic acid (PTA) approach at low temperature (~100ฐC). These samples were characterized by X-ray di~raction, wavelength-dispersive X-ray uorescence spectrometry, Fourier-transform infrared spectroscopy, nitrogen adsorption-desorption isotherm measurements, and UV-Vis spectroscopy. The photocatalytic activities of the lms were assessed by the degradation of methylene blue and formaldehyde. The results indicated that the crystallite size of anatase TiO2 was 15 nm. The photocatalytic activities toward gaseous formaldehyde degradation were similar, about 90% and 87% under UV and visible light irradiation, respectively, in the case of all the samples. These results suggested that the doped TiO2-SiO2 thin lms exhibited high photoactivities. ฉ 2012 The Society of Chemical Engineers, Japan.
Keywords
formaldehyde, Methylene blue, Tio2-SiO2 thin films
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