Stable hydrosols for TiO2 coatings

Alphonse, Pierre; Varghese, Aneesha; Tendero, Claire

doi:10.1007/s10971-010-2301-y

Cited by 57 publications

(37 citation statements)

References 59 publications

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“…The size of the crystallites increases 42% and 7% for anatase and brookite after heat treatment at 300 °C. The crystal sizes are in the range of 4 to 5.7 nm for anatase, and from 6.1 to 6.6 nm for brookite, in agreement with results reported by Alphonse [16]`.…”

Section: Xrdsupporting

confidence: 91%

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Nitrogen dopedTiO2photoactive in visible light

et al. 2015

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In this research TiO 2 modified with nitrogen has been prepared. The synthesis method used was sol gel from the hydrolysis of titanium tetrabutoxide with urea solution, combined with a low temperature treatment at atmospheric pressure. The theoretical mole ratio N/Ti was equal to 0.5 and the theoretical mole ratio HNO3/TiO 2 was equal to 0.5. The solid obtained was calcined at different temperatures in static air with high heating rate and residence time of 1 hour. The samples were characterized by X-ray diffraction, FTIR Raman and diffuse reflectance spectroscopy, thermodifferential and thermogravimetric analysis and specific surface area. All calcined solids exhibit absorption in the visible range. The Raman spectroscopy and X-ray diffraction revealed for all the heat treatments, the presence of crystalline phases corresponding to anatase and brookite polymorphism. The photocatalytic activity of the catalysts was tested in degradation of an artificial dye under visible light, yielding the best results for the sample treated at 250°C. Our results allow to say that this behaviour is due to the absorption of visible light, good efficiency for the adsorption of the dye and presence of two crystalline phases that decreases the recombination of photogenerated electrons and holes. The synthesis technique used allows obtaining solids with textural and attractive photocatalytic properties.

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Section: Xrdsupporting

confidence: 91%

“…Between 260ºC and 345ºC, slow oxidation processes take place associated with a broad exothermic heat effect, which stops at 345ºC. The peak at 388ºC is attributed to the crystallization of amorphous TiO 2 into anatase with a mass loss (1%) due to the removal of the hydroxyl groups trapped inside the particles [16]. Fig.…”

Section: Dta-tgmentioning

confidence: 96%

Nitrogen dopedTiO2photoactive in visible light

et al. 2015

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“…Ref. [11] describes a sol-gel method of generating the TiO 2 anatase-brookite crystal form in an aqueous solution using peptizing agent, and Ref. [12] reports high photoactivity of nanocomposites obtained using this method without annealing.…”

Section: Introductionmentioning

confidence: 99%

Low-temperature sol–gel synthesis of nanosized pseudobrookite crystals without heat treatment

Vinogradov

Gerasimova

et al. 2012

Journal of Alloys and Compounds

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“…Considering the need for drawing ultradispersed metal nanoparticles and their propensity to agglomerate, one requires to minimize their accumulation and formation of large particles. For protection from agglomeration using special polymers (for example, polyvinyl alcohol) [7] or molecules (usually containing nucleophilic atoms, such as thiols, amines or phosphines) [8].…”

Section: Introductionmentioning

confidence: 99%

“…This method described in [8] allows to obtain the TiO 2 particles with size of about 10 nm generated from the anatase-brookite form nanocrystals, and, in contrast to existing [9] approaches, does not require the subsequent calcination. Spincoating films obtained from these colloidal solutions have a very high specific surface area and are often considered as a way to adjust electronic, optical, or catalytic properties [3,10].…”

Section: Introductionmentioning

confidence: 99%