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

Vinogradov, Alexandr V.; Vinogradov, Vladimir V.; Gerasimova, T. V.; Агафонов, А. В.

doi:10.1016/j.jallcom.2012.04.066

Cited by 13 publications

(11 citation statements)

References 21 publications

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“…The heat evolved during the CAC hydration [24] favoured this hydrothermal system that likely led to the interaction. In this line, several works had reported the obtaining of iron titanates (namely pseudobrookite and ilmenite) by means of low temperature hydrothermal and sol-gel methods [25][26][27].…”

Section: Effect Of the Tio 2 On The Properties Of Cac Mortarsmentioning

confidence: 99%

Photocatalytic NOx abatement by calcium aluminate cements modified with TiO2: Improved NO2 conversion

Perez-Nicolas

Balbuena

Cruz-Yusta

et al. 2015

Cement and Concrete Research

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Photocatalytic activity of TiO 2 was studied in two types of Calcium Aluminate Cement (CAC) under two different curing regimes. The effect of the TiO 2 addition on the setting time, consistency and mechanical properties of the CACs was evaluated. The abatement of gaseous pollutants (NO x ) under UV irradiation was also assessed. These cementitious matrices were found to successfully retain NO 2 : more abundant presence of aluminates in white cement (w-CAC, iron-lean) helped to better adsorb NO 2 , thus improving the conversion performance of the catalyst resulting in a larger NO x removal under UV irradiation. As evidenced by XRD, SEM, EDAX and zeta potential analyses, the presence of ferrite in dark cement (d-CAC, iron-reach) induced a certain chemical interaction with TiO 2 . The experimental findings suggest the formation of new iron titanate phases, namely pseudobrookite. The reduced band-gap energy of these compounds compared with that of TiO 2 accounts for the photocatalytic activity of these samples.

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Section: Effect Of the Tio 2 On The Properties Of Cac Mortarsmentioning

confidence: 99%

Photocatalytic NOx abatement by calcium aluminate cements modified with TiO2: Improved NO2 conversion

Perez-Nicolas

Balbuena

Cruz-Yusta

et al. 2015

Cement and Concrete Research

View full text Add to dashboard Cite

show abstract

“…The number of articles on producing sol-gel mixed oxides possessing a high degree of crystallinity and, as a consequence, high functional characteristics is continuously increasing. In our papers, 31,33 we have proved the possibility of obtaining crystalline mixed oxides using sol-gel chemistry for several systems without an annealing stage.…”

Section: Mixed Oxidesmentioning

confidence: 97%

“…Indeed, "re-dissolving" in HNO 3 the XRD amorphous precipitate from the hydrolysis of titanium alkoxides provides a stable sol consisting of uniform anatase nanoparticles. 24,[30][31][32][33] Among other ways of activating the crystallization (not the least important, and gaining popularity at present) are external physical factors (ultrasound, microwaves, UV) under atmospheric pressure. 26,35 The general mechanisms for the effects of a medium's pH and external physical factors on the growth of crystalline phase are considered below.…”

Section: Ways To Increase Crystallinity In a Solutionmentioning

confidence: 99%

“…27,34 For instance, our group has succeeded in employing a low-temperature, ultrasonic-assisted method to prepare nanocrystalline TiO 2 (ref. 31) and AlOOH 27 sol-gel materials directly from the hydrolysis products of alkoxide precursors in an aqueous medium with no addition of modifying agents.…”

Section: Physical Activation Of Colloidal Particles and Growth Of Cry...mentioning

confidence: 99%

“…In this case, the formation of a nanocomposite takes place due to a deep intercomponental penetration of disperse phases at the nanolevel during the course of sol-gel reactions. 31,33 Such an approach, in combination with chemical or physical peptization, will obviously make it possible to realize a simple way to synthesize sols of crystalline mixed oxides at low temperatures directly.…”

Section: Mixed Oxidesmentioning

confidence: 99%

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