Preparation and application of nanoglued binary titania–silica aerogel

Luo, Liang; Cooper, Adrienne T.; Fan, Maohong

doi:10.1016/j.jhazmat.2008.03.105

Cited by 61 publications

(19 citation statements)

References 46 publications

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“…The corresponding estimated band gap energies for the pure and the Si-doped TiO 2 hollow spheres are 3.32 eV and 3.38 eV, respectively. It has been recognized that the higher band gap energy possesses the higher oxidizing potential of the photo-generated holes, which leads to greater photocatalytic activity of TiO 2 [51]. Therefore, it is anticipated that the photocatalytic performance of TiO 2 hollow spheres will be improved by doping of silicon.…”

Section: Uv-vis Diffuse Reflectance Spectramentioning

confidence: 99%

Enhanced photocatalytic activity of silica-embedded TiO2 hollow microspheres prepared by one-pot approach

Liu

Zhang

2010

Journal of Alloys and Compounds

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Section: Uv-vis Diffuse Reflectance Spectramentioning

confidence: 99%

Enhanced photocatalytic activity of silica-embedded TiO2 hollow microspheres prepared by one-pot approach

Liu

Zhang

2010

Journal of Alloys and Compounds

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“…[8,9,10]Stable sols can be obtained under acidic conditions at pH < 2 and the resulting materials usually have good photocatalytic activities. [11,12] Changing the experimental conditions and applying heat treatment influence the final composition and microstructure of the material. [13]Anatase nucleates grow first during the sol-gel process.However, calcination at higher temperatures induces a phase transformation from anatase to the thermodynamically more stable rutile.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic performance of highly amorphous titania–silica aerogels with mesopores: The adverse effect of the in situ adsorption of some organic substrates during photodegradation

Lázár

Kalmár

Peter

et al. 2015

Applied Surface Science

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Abstract. Titania-silica composite aerogels with 16 -29% Ti-content by the mass were synthesized by the sol-gel method from different Ti-precursors, and calcined at 500°C. These aerogels are highly amorphous as no crystalline TiO 2 phase can be detected in them by X-ray diffraction methods, and show the dominating presence of either mesopores or macropores.The incorporation of Ti into the silica structure is shown by the appearance of characteristic IR transitions of Si-O-Ti vibrations.The characteristic band-gap energies ofthe different aerogelsare estimated to be between 3.6 and 3.9 eV from UV reflection spectra. Band-gap energy decreases with decreasing pore-size. When suspended in solution,even these highly amorphous aerogels accelerate the photodegradation of salicylic acid and methylene blue compared to simple photolysis. Kinetic experiments were conducted under illumination, and also in the dark to study the adsorption of the substrates onto the suspended aerogels.We assume that the fast in-situadsorption of the organic substratesmask the suspended aerogel particles from UV photons,which reduces the rate of photocatalysis. We managed to mathematically separate the parallelprocesses of photocatalysis and adsorption, and develop a simple kinetic model to describe the reaction system.

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“…In addition, some aerogels with functional particles have been studied. For example, an aerogel composed of titania and silica 5) or the composite of metallic nickel and alumina aerogel 6) exhibited superior catalytic performance. However, any functional aerogels consisting of a magnetic and dielectric materials have not been prepared due to uncontrollable gelation and lack of variety of their metal alkoxides and their expensive cost etc.…”

Section: ¹1mentioning

confidence: 99%

Preparation and evaluation of ferrite-silica aerogel nanocomposite

Katagiri

Adachi

Ota

2014

J. Ceram. Soc. Japan

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The ferrite-silica aerogel nanocomposite prepared by a solgel process and a supercritical drying process was investigated from the point of view of new composite material. The ferrite nanoparticles were prepared by a coprecipitation method and added to tetramethylorthosilicate (TMOS) in the range of 0 to 20 mol %. The ferrite-silica wet gel was prepared from TMOS containing ferrite nanoparticles, ethanol, deionized water and NH 3 aq. as a catalyst, and replaced the liquid phase and aged in the ethanol. Then, a hydrophobing treatment was performed in hexamethyldisilazane toluene solution. Finally, the ferrite-silica wet gel was dried in the supercritical carbon dioxide fluid. The obtained ferrite-silica aerogel nanocomposite was evaluated by bulk density, porosity, specific surface area, pore size distribution, SEM and TEM observation, EDS analysis and magnetization measurement by VSM. As a result, even if it added the ferrite, the characteristics of aerogel was held and the magnetic property of the ferrite remained unchanged in the aerogel.

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Preparation and application of nanoglued binary titania–silica aerogel

Cited by 61 publications

References 46 publications

Enhanced photocatalytic activity of silica-embedded TiO2 hollow microspheres prepared by one-pot approach

Enhanced photocatalytic activity of silica-embedded TiO2 hollow microspheres prepared by one-pot approach

Photocatalytic performance of highly amorphous titania–silica aerogels with mesopores: The adverse effect of the in situ adsorption of some organic substrates during photodegradation

Preparation and evaluation of ferrite-silica aerogel nanocomposite

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