TiO2-SiO2 binary xerogels: Synthesis and characterization

Mikushina, Yu. V.; Шишмаков, А. Б.; Matskevich, Vladislav; Журавлев, Н. А.; Koryakova, O. V.; Kharchuk, V. G.; Petrov, L. A.

doi:10.1134/s0036023608100069

Cited by 12 publications

(11 citation statements)

References 17 publications

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“…In addition, it has been widely reckoned that the surface properties can be tuned by elaborate control of the synthetic method. Solegel chemistry is a common method for the synthesis of titaniaesilica mixed oxides and was hence employed in this work (Brinker and Scherer, 1990;Mikushina et al, 2008;Pirson et al, 1995). Enhancement of morphological features of such materials has been attempted by using hydrothermal and supercritical drying techniques.…”

Section: Introductionmentioning

confidence: 99%

An investigation into the effect of porosities on the adsorption of rhodamine B using titania–silica mixed oxide xerogels

Rasalingam

Peng

Koodali

2013

Journal of Environmental Management

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Section: Introductionmentioning

confidence: 99%

An investigation into the effect of porosities on the adsorption of rhodamine B using titania–silica mixed oxide xerogels

Rasalingam

Peng

Koodali

2013

Journal of Environmental Management

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“…Fig. 5b shows that the characteristic IR absorption bands of silica gel at around 1100 cm -1 and 470 cm -1 are all observed in both residues (Mikushina et al, 2008), which indicates that most of the colloidal silica tends to form silica gel in the 40% H2SO4 solution. Fig.…”

Section: Recovery Of Titanium By Sulfuric Acid Leachingmentioning

confidence: 90%

Treatment of tionite residue from titanium oxide industry for recovery of TiO2 and removal of silica

et al. 2016

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Solid waste tionite generated in the sulfate process for TiO2 production is a secondary titanium resource with high silicon content. To recover titanium and remove silicon from the tionite, a process involving hydrothermal conversion, water washing, and acid leaching was proposed. To avoid Na2O loss, the formation of Na2TiSiO5 by-product was prevented by adding CaO. XRD, ICP-OES and FT-IR were used to examine the transformation of the titanium and silicon. The optimum hydrothermal conditions are NaOH/tionite mass ratio of 4:1, Ca/Si molar ratio of 1:1 in 45% NaOH solution at 240°C for 1 h. Under these conditions, the titanium conversion was 97.3% with Na2TiO3 as the main titanium phase, while most silicon was converted to Ca2SiO4, and katoite, and NaCaHSiO4, instead of Na2TiSiO5. About 97.5% of the Na2O was recovered after washing the hydrothermal products with water, and 93.1% of the silicon retained in the washed solution was removed by adding CaO. After leaching the washed products with 40% H2SO4 solution at 60°C, about 97% of the titanium was easily recovered, forming the titanyl sulfate solution that was employed for TiO2 production. The Ca and Si components formed CaSO4 and silica gel, which were then separated from the acid leaching solution.

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“…3) a set of vibrations can be seen as characteristic of the materials studied. The band at 794-804 cm -1 is assigned to symmetric stretching vibrations of the Si-O-Si bond [26][27][28][29]. Intensive band at 947-960 cm -1 is usually attributed to the stretching vibrations of the Si-O-Ti bond [27][28][29] for TiO 2 /SiO 2 mixed oxides prepared through simultaneous hydrolysis of the titanium and silicon containing organometallic precursors.…”

Section: Ftir Investigationmentioning

confidence: 99%

“…It was observed the increase of the surface hydroxylation of titanium-containing silica in comparison with bare SiO 2 films after similar thermoactivation. According to [26], the reduction in the absorption frequency of Si-O stretching vibration (near 1100 cm -1 ) indicates the distortion of a SiO 4 tetrahedron in the presence of a heavier neighboring atom linked to a tetrahedron via an oxygen atom. The formation of Ti-O-Si bonds is assumed to be a key factor affecting surface properties such as step of surface hydroxylation and surface acidity and catalytic function of silica-titania [9,10,32].…”

Section: Ftir Investigationmentioning

confidence: 99%

Photodegradation of dye acridine yellow on the surface of mesoporous TiO2, SiO2/TiO2 and SiO2 films: spectroscopic and theoretical studies

et al. 2015

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Electronic spectra and LDI mass spectra changes accompanying photodegradation of acridine yellow (AY) adsorbed on the surface of prepared via templated sol-gel synthesis TiO 2 , SiO 2 , and TiO 2 /SiO 2 mesoporous films have been investigated and the main photodegradation products have been determined. The results of calculations show the adsorption energy of the molecular state of AY to be the greatest for the complex with titania-silica where Lewis acidic sites are present, the smallest one being related to the complex with titania what corresponds to the experimental data. Effectiveness of acridine yellow photodegradation on the surfaces of mesoporous films under UV irradiation increases in a row SiO 2 \ TiO 2 /SiO 2 \ TiO 2 . Electronic and laser desorption/ionization mass spectra and theoretical modeling give evidence that efficient photobleach of AY localized at the surface of anatase films proceeds through the following steps: 1-N-demethylation/deamination; 2-photodimerization; 3-photodegradation.

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TiO2-SiO2 binary xerogels: Synthesis and characterization

Cited by 12 publications

References 17 publications

An investigation into the effect of porosities on the adsorption of rhodamine B using titania–silica mixed oxide xerogels

An investigation into the effect of porosities on the adsorption of rhodamine B using titania–silica mixed oxide xerogels

Treatment of tionite residue from titanium oxide industry for recovery of TiO2 and removal of silica

Photodegradation of dye acridine yellow on the surface of mesoporous TiO2, SiO2/TiO2 and SiO2 films: spectroscopic and theoretical studies

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