FTIR and UV-Vis (diffuse reflectance) spectroscopic characterization of TiO2 sol-gel

López, T.; Sánchez, E.; Bosch, P.; Meas, Y.; Gómez, R.

doi:10.1016/0254-0584(92)90270-i

Cited by 150 publications

(69 citation statements)

References 22 publications

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“…4a) showed two endothermic peaks at 98 and 172 • C, associated with the loss of physically adsorbed and entrapped water, respectively [33] and three exothermic peaks at 324, 408, and 643 • C. They are attributed to the partial dehydroxylation of the titania surface, the crystallization of anatase phase [34,35] and the transformation of anatase into rutile phase [36], respectively.…”

Section: Resultsmentioning

confidence: 95%

Direct modification with tungstophosphoric acid of mesoporous titania synthesized by urea-templated sol–gel reactions

Fuchs

Soto

Blanco

et al. 2008

Journal of Colloid and Interface Science

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Section: Resultsmentioning

confidence: 95%

Direct modification with tungstophosphoric acid of mesoporous titania synthesized by urea-templated sol–gel reactions

Fuchs

Soto

Blanco

et al. 2008

Journal of Colloid and Interface Science

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“…The peak at 3172 cm −1 for the powder dried at 150°C is attributed to the hydroxyl group (≡Ti-OH). 26 This indicates that this powder consists of amorphous titanium hydroxide. This peak does not exist for the powder calcined at 400°C due to the formation of crystalline anatase which will be shown in the XRD pattern of Fig.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of bimodally porous titania powders by hydrolysis of titanium tetraisopropoxide

Song

Pratsinis

2000

J. Mater. Res.

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Bimodally porous titania powders with controlled phase composition and porosity were made by hydrolysis of titanium tetraisopropoxide (TTIP) and calcination. The extent of calcination was followed by thermogravimetric differential thermal analysis and Fourier transform infrared spectroscopy. The specific surface area (SSA) of the powders ranged from 10 to 500 m 2 /g as determined by nitrogen adsorption. The SSA increased by decreasing either the water concentration during hydrolysis or the calcination temperature. The pore size distribution was bimodal with fine intraparticle pore diameters at 1-6 nm and larger interparticle pore diameters at 30-120 nm as determined by nitrogen adsorption isotherms. The particle phase composition as determined by x-ray diffraction ranged from amorphous to crystalline anatase and rutile largely proportional to the calcination temperature and to a lesser extent on the initial H 2 O/TTIP molar ratio.

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“…At 1630 cm -1 , the vibration frequency due to the OH bending vibration band of water in the gel can be seen. Both vibration bands (1630 and 3450 cm -1 ) can be attributed to the surface of adsorbed water molecules and surface adsorbed hydroxyl groups [7,21,22]. The absorption band observed at 2310 cm -1 can be assigned to the Mo-doped TiO 2 powders and correspond to the Mo-O vibrations [8].…”

Section: Fourier Transform Infrared Spectroscopymentioning

confidence: 99%

Photocatalytic Degradation of 4-Nitrophenol on Well Characterized Sol–Gel Molybdenum Doped Titania Semiconductors

López

Gómez

2011

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Mesoporous TiO 2 -Mo materials with different Mo contents (0-5.0 wt%) were synthesized by the sol-gel method. In samples annealed at 500°C, specific surface areas ranging from 150 to 86 m 2 /g were obtained. X-ray diffraction spectra denoted that the titania anatase phase (*28 nm) was significantly strengthened by the presence of Mo. The UV-vis diffuse reflectance spectra showed that the band gap was shifted to lower energy levels in the samples with higher Mo contents. Fourier transform infrared analysis evidenced that the hydroxylated samples persisted after annealing at 500°C. X-ray photoelectron spectroscopy analyses showed the presence of Mo 4? and Mo 6? species, where Mo 6? can be transformed from this state to a lower oxidation state during the annealing treatments. The study of the photocatalytic degradation of 4-nitrophenol (4-NP) showed that the activity can be related to the c cell parameter of the anatase phase in the Mo-doped semiconductors. Total mineralization of 4-NP up to 98% (TOC) was obtained in the sample (1.0 wt% Mo) with the highest photoactivity.

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FTIR and UV-Vis (diffuse reflectance) spectroscopic characterization of TiO2 sol-gel

Cited by 150 publications

References 22 publications

Direct modification with tungstophosphoric acid of mesoporous titania synthesized by urea-templated sol–gel reactions

Direct modification with tungstophosphoric acid of mesoporous titania synthesized by urea-templated sol–gel reactions

Synthesis of bimodally porous titania powders by hydrolysis of titanium tetraisopropoxide

Photocatalytic Degradation of 4-Nitrophenol on Well Characterized Sol–Gel Molybdenum Doped Titania Semiconductors

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