Photocatalytic properties in aqueous solution of porous TiO2-anatase films prepared by sol–gel process

Arconada, N.; Castro, Yolanda; Durán, Alicia

doi:10.1016/j.apcata.2010.06.051

Cited by 66 publications

(35 citation statements)

References 33 publications

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“…All of the bands observed at ³15601400 cm ¹1 correspond to the asymmetric and symmetric CH vibrations from the F127. 35) All these bands are almost completely removed at 700°C. The bands from ³660570 cm ¹1 are ascribed to the stretching vibrations of C=C on acetylacetonates, from de yttrium precursor, and as observed, are completely eliminated from 600°C, indicating that from this temperature the crystallization process began, in concordance of DTA observations.…”

Section: ¹mentioning

confidence: 83%

Synthesis and photoluminescent properties of Y2O3:Eu3+ thin films prepared from F127-containing solution

Ramírez

Domínguez

Medina-Velazquez

et al. 2014

J. Ceram. Soc. Japan

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Dense and transparent Y 2 O 3 :Eu 3+ films were prepared by the solgel process and dip-coating technique from an yttrium 24 pentanedionate, europium nitrate and a methanol solution modified with F127 pluronic acid, by incorporation of acetic acid as pH modifier and acetylacetone as sol stabilizer. It was evaluated the effect of the F127/Y molar relationship (0, 0.1, 0.2, 1.0, 1.2 and 5.0) on the structure and photoluminiscent properties of the derived thin films. After 3 dipping-cycles, XRD results showed that the F127-modified films began to crystallize at 600°C into the cubic structure, and from 800°C, was found that the presence of F127 changes the preferential orientation from a ©100ª orientation, for the non-modified sample, to a ©111ª orientation, for the modified ones. M-lines spectroscopy characterization showed that the maximum thickness of the films modified and annealed at 900°C was 1937 nm (µ = 4.87 g cm ¹3, © = 1.887), compared with the 881 nm (µ = 4.94 g cm ¹3, © = 1.907) for a non-modified sample. Differential thermal analysis (DTA) and infrared spectroscopy (FTIR) were carried out to evaluate the chemical and structural evolution of the xerogel formed during the annealing process. AFM micrographs showed smooth crack-free surface (Ra = 9.2 nm) on a F127/Y = 0.2 sample. Finally, the films presented a typical Eu 3+ reddish emission at 611 nm (D o ¼ 7 F 2 ), which was analyzed as function of the F127 pluronic content and the annealing temperature.

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Section: ¹mentioning

confidence: 83%

Synthesis and photoluminescent properties of Y2O3:Eu3+ thin films prepared from F127-containing solution

Ramírez

Domínguez

Medina-Velazquez

et al. 2014

J. Ceram. Soc. Japan

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“…Moreover, the design and development of mesostructured TiO 2 materials by combining the sol-gel method with the use of surfactants as structure-directing agents allow producing coatings with tailored pore sizes and high specific surface area. The contact surface between the catalyst and the species to be eliminated greatly increases in these films, improving their photocatalytic activity [14,26] compared to that of powder and bulk materials. These characteristics allow solving the limitations on the pore size of zeolites and provide new opportunities in catalytic applications.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, transparent thin films are already used in self-cleaning windows for buildings [17]. Different techniques, such as spray pyrolysis [18], sol-gel method [14,19], sputtering [20], solvothermal method [21], pulsed laser deposition [22], atomic layer deposition [23], and chemical vapour deposition (CVD) [24], have been used to obtain TiO 2 coatings. Particularly, sol-gel process is widely used due to its multiple advantages, including the easiness to obtain TiO 2 in anatase phase at low temperature.…”

Section: Introductionmentioning

confidence: 99%

“…The photocatalytic activity mainly depends on the redox potential of the surface and on the lifetime of electronhole pairs. In order to improve the reaction rate and the efficiency of the photocatalyst, different strategies have been considered, including manipulation of the crystal structure [10], generation of vacancies [11], doping with other elements [12], functionalisation of the interface [13], and increase in surface area [14], among others.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced photocatalytic activity of mesoporous SiO2/TiO2 sol–gel coatings doped with Ag nanoparticles

Roldán

Castro

Pellegri

et al. 2015

J Sol-Gel Sci Technol

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In the present study, as-prepared silver nanoparticles have been incorporated into SiO 2 and TiO 2 sols. The characterisation of the silver nanoparticles was performed through transmission electron microscopy, grazing X-ray diffraction, and UV-visible spectroscopy, before and after mixing with the different sols. Multilayer coatings doped with silver nanoparticles were also prepared by combining different compositions and analysed by TEM and GXRD. The photocatalytic activity was studied through the degradation of methyl orange in aqueous solution under UV light exposure. High photocatalytic efficiency was observed for all the multilayer coatings. The highest efficiency was obtained for the Ag-SiO 2 /TiO 2 mesoporous system that reached a degradation percentage of methyl orange up to 94 % after 2.5 h of irradiation, near the complete elimination of the pollutant. The mechanism that explains the high photocatalytic efficiency of this multilayer coating is associated with the high porosity of the mesoporous coatings and with the increase in the local electric field, associated with the effect of plasmon resonance surface produced for the presence of metallic silver nanoparticles in the SiO 2 film.

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“…Polyethylene glycol (PEG) is one pore-generating agent that has been widely used in preparing TiO 2 porous thin lms by sol-gel. [8][9][10] The addition amount and molecular weight (M W ) of PEG were reported to be the main parameters in tailoring the lm porosity, [9][10][11] where a higher degree of either parameter tended to improve the lm porosity. 9,11) Given that the pore formation is caused by the decomposition of PEG, the characteristics of its thermal decomposition could potentially be another in uential parameter affecting the nature of the lm porosity.…”

Section: Introductionmentioning

confidence: 99%

Effect of the Added Polyethylene Glycol Molecular Weight and Calcination Heating Rate on the Morphology of TiO2 Films Formed by Sol-Gel

2017

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This research investigated the changing morphology of silicon (Si)-supported titanium dioxide (TiO 2 ) thin lms with different heating rates and molecular weights (M W ) of the added polyethylene glycol (PEG). The TiO 2 lms were deposited on a Si wafer (100) by sol-gel spin coating with PEG (M W = 6,000 or 35,000 g·mol −1 ) as pore generating agents. Calcination at 450 C completely decomposed all the organic residues in the TiO 2 sol, and the resultant lms were in the anatase phase. The combustion nature of PEG was found to be the main factor controlling the lm s morphology, where the exothermic heat of PEG combustion tended to be higher with increased heating rates and dependent on the type of PEG (extended and folded chain crystal). At heating rates of 10 C·min −1 or higher, the exothermic heat led to localized grain coalescence in the TiO 2 lms, which decreased the lm porosity. However, this exothermic heat also simultaneously induced pore agglomeration. Hence, the average pore size of PEG-containing lms were larger than in lms without PEG. In contrast, the heating rate did not signicantly affect the morphology lms without PEG.

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Photocatalytic properties in aqueous solution of porous TiO2-anatase films prepared by sol–gel process

Cited by 66 publications

References 33 publications

Synthesis and photoluminescent properties of Y<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup> thin films prepared from F127-containing solution

Synthesis and photoluminescent properties of Y<sub>2</sub>O<sub>3</sub>:Eu<sup>3+</sup> thin films prepared from F127-containing solution

Enhanced photocatalytic activity of mesoporous SiO2/TiO2 sol–gel coatings doped with Ag nanoparticles

Effect of the Added Polyethylene Glycol Molecular Weight and Calcination Heating Rate on the Morphology of TiO<sub>2</sub> Films Formed by Sol-Gel

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