Effects of SiO2 addition on TiO2 crystal structure and photocatalytic activity

Tobaldi, David Maria; Tucci, A.; Škapin, Andrijana Sever; Esposito, L.

doi:10.1016/j.jeurceramsoc.2010.05.014

Cited by 102 publications

(61 citation statements)

References 47 publications

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“…and TiNAA450, the peak at around 1630 cm −1 corresponds to the bending vibrations of O-H, while the broad band at approximately 3450 cm −1 is assigned to surface-adsorbed hydroxyl groups [89]. When the thermal treatment temperature was increased to 600 °C, both TiA600 and TiNAA600 lost both the O−H and the surface-adsorbed hydroxyl groups.…”

Section: Spectroscopic Analysesmentioning

confidence: 99%

Nitrogen-modified nano-titania: True phase composition, microstructure and visible-light induced photocatalytic NO abatement

Tobaldi

Pullar

Gualtieri

et al. 2015

Journal of Solid State Chemistry

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Section: Spectroscopic Analysesmentioning

confidence: 99%

Nitrogen-modified nano-titania: True phase composition, microstructure and visible-light induced photocatalytic NO abatement

Tobaldi

Pullar

Gualtieri

et al. 2015

Journal of Solid State Chemistry

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“…55,56 The light source was a 300 W Xenon lamp (Newport Oriel Instruments, US), having a light intensity of approximately 30 W m -2 in the λ range of 300-400 nm, and 300 W m -2 in the λ range of 400-800 nm. Visible-light irradiation was achieved by way of a filter at 400 nm; light intensity was approximately zero in the λ range of 300-400 nm, and 160 W m -2 in the λ range of 400-800 nm.…”

Section: Evaluation Of Photocatalytic Activity (Pca)mentioning

confidence: 99%

Non-aqueous sol–gel synthesis through a low-temperature solvothermal process of anatase showing visible-light photocatalytic activity

et al. 2014

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A novel, facile method based on a non-aqueous sol-gel solvothermal process has been developed to synthesise spherical TiO 2 nanoparticles (NPs) in one pot. The reaction between titanium (IV) tert-butoxide (Ti[OC(CH 3 ) 3 ] 4 ) and benzyl alcohol is a simple procedure, that resulted in the formation of highly crystalline titania NPs with a small size of only 6 nm, and with a correspondingly high surface area. The chemical formation mechanism of the metal oxide NPs has been proposed, and the degree of surface hydroxyls (-OH groups) examined. The products of the synthesis were characterised by X-ray powder diffraction (XRPD) including the advanced whole powder pattern modelling (WPPM) method, high-resolution transmission electron microscopy (HR-TEM), thermo-gravimetric analysis (TGA), UV-visible diffuse reflectance spectroscopy (DRS), Fourier transform infrared spectroscopy (FT-IR), and nuclear magnetic resonance (NMR). The photocatalytic activity (PCA) was evaluated both in liquidsolid phase, by monitoring the degradation of an organic dye (methylene blue (MB)) under UV-light irradiation, and in gas-solid phase, by following the degradation of 2-propanol, under UV-and visible-light exposure. The synthesized titania powders showed themselves to be excellent photocatalysts in liquid-solid phase (under UV irradiation), but also to possess a superior PCA in gas-solid phase, under visible-light exposure. The effects on the PCA of the very small crystalline domain size, surface composition and the presence of organic molecules from the synthesis process of the TiO 2 NPs were shown to account for this behaviour.

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“…Effectiveness of the heating and TiO 2 powder modification (η) with SiO 2 nanoparticles. The heating of TiO 2 powder mixtures with SiO 2 nanoparticles at a temperature of 150, 400, and 800 С cannot lead to the formation of new phases, because even at a higher heating temperature (900, 1000, and 1200 С) of TiO 2 + SiO 2 powder mixtures, the Ti (1Àx) Si x O 2 solid solution is not formed [33].…”

Section: à2mentioning

confidence: 99%

“…When SiO 2 particles are added to the TiO 2 powder, the phase transition is facilitated: transition temperature reduces and the relative rutile concentration increases [33]. Therefore, the TiO 2 powder mixtures with SiO 2 nanoparticles heated at 800 C can give an increase in the relative rutile concentration, a change in the particle size and specific surface area, the concentration of absorbed gases, and stability to an impact of electron exposure.…”

Section: à2mentioning

confidence: 99%

Investigation of Optical Properties and Radiation Stability of TiO2 Powders before and after Modification by Nanopowders of Various Oxides

Михайлов¹,

Нещименко²,

Yuryev³

et al. 2018

Titanium Dioxide - Material for a Sustainable Environment

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The titanium dioxide powders are widely used as a pigment for coatings and paints, the important characteristics of which are reflectivity and stability to irradiation. The results of investigations of the optical properties and radiation stability of titanium dioxide powders before and after high-temperature modification with nanopowders are presented in this chapter. The diffuse reflection spectra of various titanium dioxide powders in the UV, visible, and near-IR ranges, and their change during irradiation by electrons with 30 keV energy and a different fluence in vacuum in situ were investigated: (1) TiO 2 powders with particle size in the range 60-240 nm; (2) Microsized TiO 2 powder (240 nm) modified by Al 2 O 3 ,ZrO 2 ,SiO 2 , TiO 2 , ZnO, MgO nanoparticles with grain size from 30 up to 60 nm; (3) Microsized TiO 2 powder (260 nm) modified by SiO 2 with the grain size of 12-14 nm at the temperature of 150, 400, and 800 C. The reduction in reflectivity in entire spectrum with decrease in grain sizes of TiO 2 nanopowders was established. Nanopowder with the grain size of 80 nm possesses the highest stability to irradiation. It was shown that the average grain size and specific surface of introduced nanoparticles effect noticeably on the radiation stability increase of titanium dioxide powders modified with nanoparticles of various oxides. The micro-sized TiO 2 powder heating at temperature of 800 о С is the factor which positively influences on the radiation stability.

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Effects of SiO2 addition on TiO2 crystal structure and photocatalytic activity

Cited by 102 publications

References 47 publications

Nitrogen-modified nano-titania: True phase composition, microstructure and visible-light induced photocatalytic NO abatement

Nitrogen-modified nano-titania: True phase composition, microstructure and visible-light induced photocatalytic NO abatement

Non-aqueous sol–gel synthesis through a low-temperature solvothermal process of anatase showing visible-light photocatalytic activity

Investigation of Optical Properties and Radiation Stability of TiO2 Powders before and after Modification by Nanopowders of Various Oxides

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