Characterization of iron-doped titania sol-gel materials

T. López; J. A. Moreno; R. Gómez; X. Bokhimi; J. A. Wang; H. Yee-Madeira; G. Pecchi; P. Reyes

doi:10.1039/b105724n

Characterization of iron-doped titania sol-gel materials

T. López, J. A. Moreno, R. Gómez, X. Bokhimi, J. A. Wang, H. Yee-Madeira, G. Pecchi, P. Reyes

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Abstract

Fe/TiO₂ materials at 1 wt% Fe content have been prepared by the addition of aqueous solutions of FeCl₂ to titanium n-tetrabutoxide using hydrochloric acid (pH 3) as a hydrolysis catalyst. The obtained gel was thermally treated at 200, 400, 600 and 800°C. Characterization of the materials was performed by FTIR, UV-Vis, Mössbauer and X-ray powder diffraction. FTIR spectra of the calcined samples showed the presence of highly hydroxylated TiO₂. The XRD patterns show the coexistance of brookite, anatase and rutile TiO₂ phases in samples treated up to 600°C. In the sample treated at 800°C rutile was the only phase observed. UV-Vis spectroscopy revealed that the band gap E_g of the samples increased with increased thermal treatment temperature. Mössbauer spectroscopy showed the coexistance of Fe²⁺ and Fe³⁺ on the TiO₂ samples treated at high temperatures.

Original language	English
Pages (from-to)	714-718
Number of pages	5
Journal	Journal of Materials Chemistry
Volume	12
Issue number	3
DOIs	https://doi.org/10.1039/b105724n
State	Published - 2002
Externally published	Yes

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title = "Characterization of iron-doped titania sol-gel materials",

abstract = "Fe/TiO2 materials at 1 wt% Fe content have been prepared by the addition of aqueous solutions of FeCl2 to titanium n-tetrabutoxide using hydrochloric acid (pH 3) as a hydrolysis catalyst. The obtained gel was thermally treated at 200, 400, 600 and 800°C. Characterization of the materials was performed by FTIR, UV-Vis, M{\"o}ssbauer and X-ray powder diffraction. FTIR spectra of the calcined samples showed the presence of highly hydroxylated TiO2. The XRD patterns show the coexistance of brookite, anatase and rutile TiO2 phases in samples treated up to 600°C. In the sample treated at 800°C rutile was the only phase observed. UV-Vis spectroscopy revealed that the band gap Eg of the samples increased with increased thermal treatment temperature. M{\"o}ssbauer spectroscopy showed the coexistance of Fe2+ and Fe3+ on the TiO2 samples treated at high temperatures.",

author = "T. L{\'o}pez and Moreno, {J. A.} and R. G{\'o}mez and X. Bokhimi and Wang, {J. A.} and H. Yee-Madeira and G. Pecchi and P. Reyes",

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doi = "10.1039/b105724n",

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TY - JOUR

T1 - Characterization of iron-doped titania sol-gel materials

AU - López, T.

AU - Moreno, J. A.

AU - Gómez, R.

AU - Bokhimi, X.

AU - Wang, J. A.

AU - Yee-Madeira, H.

AU - Pecchi, G.

AU - Reyes, P.

PY - 2002

Y1 - 2002

N2 - Fe/TiO2 materials at 1 wt% Fe content have been prepared by the addition of aqueous solutions of FeCl2 to titanium n-tetrabutoxide using hydrochloric acid (pH 3) as a hydrolysis catalyst. The obtained gel was thermally treated at 200, 400, 600 and 800°C. Characterization of the materials was performed by FTIR, UV-Vis, Mössbauer and X-ray powder diffraction. FTIR spectra of the calcined samples showed the presence of highly hydroxylated TiO2. The XRD patterns show the coexistance of brookite, anatase and rutile TiO2 phases in samples treated up to 600°C. In the sample treated at 800°C rutile was the only phase observed. UV-Vis spectroscopy revealed that the band gap Eg of the samples increased with increased thermal treatment temperature. Mössbauer spectroscopy showed the coexistance of Fe2+ and Fe3+ on the TiO2 samples treated at high temperatures.

AB - Fe/TiO2 materials at 1 wt% Fe content have been prepared by the addition of aqueous solutions of FeCl2 to titanium n-tetrabutoxide using hydrochloric acid (pH 3) as a hydrolysis catalyst. The obtained gel was thermally treated at 200, 400, 600 and 800°C. Characterization of the materials was performed by FTIR, UV-Vis, Mössbauer and X-ray powder diffraction. FTIR spectra of the calcined samples showed the presence of highly hydroxylated TiO2. The XRD patterns show the coexistance of brookite, anatase and rutile TiO2 phases in samples treated up to 600°C. In the sample treated at 800°C rutile was the only phase observed. UV-Vis spectroscopy revealed that the band gap Eg of the samples increased with increased thermal treatment temperature. Mössbauer spectroscopy showed the coexistance of Fe2+ and Fe3+ on the TiO2 samples treated at high temperatures.

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U2 - 10.1039/b105724n

DO - 10.1039/b105724n

M3 - Artículo

SN - 0959-9428

VL - 12

SP - 714

EP - 718

JO - Journal of Materials Chemistry

JF - Journal of Materials Chemistry

IS - 3

ER -

Characterization of iron-doped titania sol-gel materials

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