TiO2–SiO2 mixed oxides prepared by a combined sol–gel and polymer inclusion method

Pabón, Elizabeth; Retuert, Jaime; Quijada, Raúl; Zárate, Antonio

doi:10.1016/j.micromeso.2003.10.017

Cited by 100 publications

(60 citation statements)

References 34 publications

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“…The peak at 957 cm -1 indicated the vibration of the Ti-O bond in silica. According to Pabon`s report [10], this wavenumber is characteristic of the bonds of Si-O-Ti, similar to that reported by Li et al [9]. This infrared spectra showed that TiO 2 was immobilized into the silica structure.…”

Section: Strategy To Develop the Visible-light Driven Photocatalystsupporting

confidence: 84%

Synthesis of Mn(II)-Loaded TixSi1-xO4 Composite Acting as a Visible-Light Driven Photocatalyst

Misriyani¹,

Kunarti²,

Yasuda³

2015

Indones. J. Chem.

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Section: Strategy To Develop the Visible-light Driven Photocatalystsupporting

confidence: 84%

Synthesis of Mn(II)-Loaded TixSi1-xO4 Composite Acting as a Visible-Light Driven Photocatalyst

Misriyani¹,

Kunarti²,

Yasuda³

2015

Indones. J. Chem.

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“…Así, los picos a 456.2 y 457.6 eV indican un ambiente coordinativo octaédrico para el titanio (6) mientras que los ubicados a 462.3, 463.8 y 465.4 eV ponen en evidencia un ambiente coordinativo tetraédrico (6). Además, el espectro indica que el titanio presenta dos estados de oxidación, ya que el pico a 456.2 eV se puede asociar a un compuesto del tipo Ti 4+ Ti 2+ O 3 .…”

Section: Sistema [Ti/si] = [70/30]unclassified

Efectos de fotodegradación propiciados por recubrimientos de TiO2 y TiO2-SiO2 obtenidos por Sol-Gel

Fernández¹,

Guzmàn²,

Vera³

et al. 2008

Bol. Soc. Esp. Ceram. Vidr.

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El efecto de fotodegradación es ampliamente utilizado para la purificación del agua, acción que contribuye a la conservación y protección del medio ambiente; el óxido de titanio (TiO 2 ) es uno de los semiconductores que pueden degradar contaminantes mediante procesos de oxidación, lo que lo hace apto para el tratamiento de aguas residuales. En este trabajo se conformaron recubrimientos de TiO 2 y TiO 2 -SiO 2 , por el método Sol-Gel, y se estudio la degradación que experimentaba una solución de azul de metileno al introducirle estos recubrimientos e iluminarlos con una radiación de λ=365nm para activar su propiedad fotocatalítica. Los recubrimientos fueron caracterizados microestructuralmente utilizando Microscopía de Fuerza Atómica (MFA) y Espectroscopía de Fotoelectrones de rayos X (XPS). Los resultados obtenidos de los ensayos de fotodegradación indican que los recubrimientos con una cantidad pequeña de silicio presentan un mayor efecto de fotodegradación indicando que el silicio puede generar puntos de anclaje que facilitan las reacciones de fotocatálisis. Por otro lado, la formación de centros activos, constituidos principalmente por carbono, también contribuyeron al desarrollo de estas reacciones. Palabras clave: Recubrimientos; TiO 2 ; TiO 2 ,-SiO 2 ,; Sol-Gel; fotocatálisis. Photodegradation effect produced by TiO 2 and TiO 2 -SiO 2 coatings obtained by Sol-Gel.Photodegradation effect is widely used for water purification this contributes to preservation and protection of environment. Titanium oxide, (TiO 2 ), is a compound that shows up this phenomenon. TiO 2 is a semiconductor which may degradate pollutants through of a oxidation process. It permit the treatment of the residual water. It this work we has conformed coatings of TiO 2 y TiO 2 -SiO 2 , utilized Sol-Gel method and investigated the degradation of the blue Methylene. For this, we introduced these coatings in the blue methylene solution which was illuminated with radiation of λ=365nm to activate its photocatilist properties. The structures of the coatings were characterized using Atomic Force Microscopy (AFM) and X-ray Photoelectron Spectroscopy (XPS).Keywords: Coatings; TiO 2 ; TiO 2 ,-SiO 2 ,; Sol-Gel; photodegradation. INTRODUCCIóNActualmente, la conformación de recubrimientos funcionales es un tema de interés que atrae a profesionales de diferentes áreas, esto porque dichos recubrimientos presentan propiedades físicas que permiten una gran variedad de aplicaciones industriales; tal es el caso de los recubrimientos autolimpiantes cuya propiedad es una característica propia del sistema, debido a que contiene algún compuesto con propiedades fotocatalíticas. En el presente estudio se utilizo el dióxido de titanio (TiO 2 ) porque es un compuesto no tóxico, relativamente abundante y ampliamente estudiado que presenta el fenómeno de fotodegradación, efecto relacionado con la capacidad autolimpiante del sistema. El fenómeno fotoquímico básico es la absorción de la radiación por las partículas del foto catalizador. El dióxido de titanio es muy sel...

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“…This might result from the inducing effect exerted by the chitosan film. Although its enhancing effect on Si-O-Ti connectivity and its strong adsorption ability to surfactants, organic acids, and dyes has been reported, [26,29] the mechanism of functional groups in various systems is different and needs to be clarified. [30] Undoubtedly, the induction mechanism of the chitosan film on the crystal orientation and the incorporation of Ti atoms into the framework is crucial for manufacturing high-quality TS-1 zeolite films.…”

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confidence: 99%

Synthesis of b‐Oriented TS‐1 Films on Chitosan‐Modified α‐Al₂O₃ Substrates

et al. 2006

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Zeolite films have attracted much attention from the scientific community because of their potential applications as selective membranes, chemical sensors, and microelectronic devices. [1][2][3] The performance of permeable films can be greatly improved by controlling the crystal orientation on the substrate surface. [4,5] Thus far, significant progress in directing the crystal orientation on the substrate surface has been made for LTA and UTD-1, especially for MFI-type zeolite films.[6]Wang and Yan reported a highly b-oriented pure silica MFI film on porous stainless steel synthesized by in situ crystallization. [7] They could manipulate the crystal orientation by using an in situ hydrothermal reaction method, and control over the orientation on the substrate surface was achieved by simply changing the composition of the synthesis solution. By using the seeded growth method, Tsapatsis and co-workers successfully created b-oriented siliceous zeolite ZSM-5 membranes with molecular recognition ability on porous alumina substrates. [8,9] Highly selective and permeable membranes were obtained based on a good understanding of both crystal growth and interaction between crystal grains and the substrate surface.[5] The separation factor of para-to ortho-xylene isomers could be up to several hundred while keeping the permeance of para-xylene high. Based on induction by surface matrices, Yoon and co-workers could pack silicalite-1 crystals of a uniform size over a glass surface in a desired orientation.[10]Compared with Al-ZSM-5 and silicalite-1, TS-1 zeolite possesses a variety of special features. In addition to the molecular sieving effect, TS-1 films catalyze oxidative reactions as well, including selective oxidation of alcohols, [11] epoxidation of alkenes, [12] hydroxylation of aromatics, [13] oxyfunctionalization of n-hexane to hexanols and hexanones, [14,15] and photocatalytic oxidation. [16] Obviously, the availability of highly oriented TS-1 films, especially along the b-axis, will trigger their application in innovative materials, microreactors, and even microelectronic devices. [17][18][19] TS-1 zeolite has the same tetrahedral framework as Al-ZSM-5 and silicalite-1 MFI zeolites. However, the introduction of Ti atoms into the framework requires a substantially longer hydrothermal reaction time. Several research groups have synthesized TS-1 monoliths, [20,21] films, [6,22,23] and membranes. [16,24] However, all the TS-1 films and membranes reported are randomly oriented, except in the work of Lee et al. who used poly(ethylene oxide) (PEO) as a template to direct the oriented growth of TS-1 films on glass.[6] To date, we have found no published work on the synthesis of b-oriented TS-1 films on porous substrates. Here, we report a new synthesis strategy for manufacturing b-oriented TS-1 films on porous a-Al 2 O 3 substrates. Chitosan will serve as the structure-directing matrix to induce the orientation of the crystal grains with the b-axes perpendicular to the substrate surface. Finally, the performance of the s...

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TiO2–SiO2 mixed oxides prepared by a combined sol–gel and polymer inclusion method

Cited by 100 publications

References 34 publications

Synthesis of Mn(II)-Loaded Ti<sub>x</sub>Si<sub>1-x</sub>O<sub>4</sub> Composite Acting as a Visible-Light Driven Photocatalyst

Synthesis of Mn(II)-Loaded Ti<sub>x</sub>Si<sub>1-x</sub>O<sub>4</sub> Composite Acting as a Visible-Light Driven Photocatalyst

Efectos de fotodegradación propiciados por recubrimientos de TiO<sub>2</sub> y TiO<sub>2</sub>-SiO<sub>2</sub> obtenidos por Sol-Gel

Synthesis of b‐Oriented TS‐1 Films on Chitosan‐Modified α‐Al₂O₃ Substrates

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TiO2–SiO2 mixed oxides prepared by a combined sol–gel and polymer inclusion method

Cited by 100 publications

References 34 publications

Synthesis of Mn(II)-Loaded Ti<sub>x</sub>Si<sub>1-x</sub>O<sub>4</sub> Composite Acting as a Visible-Light Driven Photocatalyst

Synthesis of Mn(II)-Loaded Ti<sub>x</sub>Si<sub>1-x</sub>O<sub>4</sub> Composite Acting as a Visible-Light Driven Photocatalyst

Efectos de fotodegradación propiciados por recubrimientos de TiO<sub>2</sub> y TiO<sub>2</sub>-SiO<sub>2</sub> obtenidos por Sol-Gel

Synthesis of b‐Oriented TS‐1 Films on Chitosan‐Modified α‐Al2O3 Substrates

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Synthesis of b‐Oriented TS‐1 Films on Chitosan‐Modified α‐Al₂O₃ Substrates