Single and mixed phase TiO<sub>2</sub>powders prepared by excess hydrolysis of titanium alkoxide

Hanaor, Dorian; Chironi, Ilkay; Karatchevtseva, Inna; Triani, Gerry; Sorrell, Charles C.

doi:10.1179/1743676111y.0000000059

Cited by 80 publications

(52 citation statements)

References 61 publications

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“…21-1272) and rutile phase (JCPDF file no. 21-1276), which have dominant peaks at 2θ of about 25.28, 36.95, 37.80, 38.57, 48.05, 53.89, 55.06, 62.69, and 27.45 and 36.08, 39.19, 41.22, 44.05, 54.32, 56.64, and 69.08, respectively. The compositions of the anatase and rutile phases in TiO 2 are determined by analyzing the ratio of the anatase peak (101) at 2θ = 25.3 o to the rutile peak (101) at 2θ = 27.4 o using a slightly modified formula proposed by Hanaor et al (2012).…”

Section: Characterization Resultsmentioning

confidence: 99%

Preparation and Characterization of Fe3O4/SiO2/TiO2 Composite for Methylene Blue Removal in Water

Fisli

Ridwan

Krisyuningsih³

et al. 2017

IJTech

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The main problem with the slurry process is the difficulty in recovering the photocatalyst nanoparticle from water following purification. An alternative solution proposed the photocatalyst be immobilized on magnetic carriers, which would allow them to be recollected from the water suspension following treatment using an external magnetic field. Magnetically photocatalyst composites were prepared using simple heteroagglomeration by applying attractive electrostatic forces between the nanoparticles with an opposite surface charge. The Fe 3 O 4 /SiO 2 /TiO 2 photocatalysts were synthesized in an aqueous slurry solution containing Fe 3 O 4 /SiO 2 and TiO 2 nanoparticles under pH 5 conditions. Meanwhile, Fe 3 O 4 /SiO 2 was prepared by a simple procedure via a coprecipitation of iron(II) and iron(III) ion mixtures in ammonium hydroxide and was leached by sodium silicate. The synthesized samples were investigated to determine the phase structure, the magnetic properties, and the morphology of the composites by X-ray diffraction (XRD), vibrating sample magnetometer (VSM), and transmission electron microscopy (TEM), respectively. The results indicated that the composites contained anatase and rutile phases and exhibited a superparamagnetic behavior. Fe 3 O 4 /SiO 2 particles, which were of the aggregation spherical form at 20 nm in size, were successfully attached onto the TiO 2 surface. The catalytic activity of Fe 3 O 4 /SiO 2 /TiO 2 composites was evaluated for the degradation of methylene blue under ultraviolet (UV) irradiation. The presence of SiO 2 as a barrier between Fe 3 O 4 and TiO 2 is not only improves the photocatalytic properties but also provides the ability to adsorb the properties on the composite. The Fe 3 O 4 /SiO 2 /TiO 2 (50% containing TiO 2 in composite) were able to eliminate 87.3% of methylene blue in water through the adsorption and photocatalytic processes. This result is slightly below pure TiO 2 , which is able to degrade 96% of methylene blue. The resulting Fe 3 O 4 /SiO 2 /TiO 2 composite exhibited an excellent ability to remove dye from water and it is easily recollected using a magnetic bar from the water. Therefore, they have high potency as an efficient and simple implementation for the dye effluent decolorization of textile waste in slurry reactor processes.

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Section: Characterization Resultsmentioning

confidence: 99%

Preparation and Characterization of Fe3O4/SiO2/TiO2 Composite for Methylene Blue Removal in Water

Fisli

Ridwan

Krisyuningsih³

et al. 2017

IJTech

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“…To the best of our knowledge, the surface phase junction plays an important role in photocatalytic hydrogen production rate 6 . There have been many researchers and review articles showing that the photocatalytic hydrogen production rate of mix-phase TiO 2 is much higher than that of pure phase [7][8][9][10][11][12] . There were also researchers insisted that there was a synergetic effect exists in mix-phase TiO 2 13, 14 .…”

Section: Introductionmentioning

confidence: 99%

Graphene oxide-assisted synthesis and photocatalytic hydrogen production of mix-phase titanium dioxide (TiO₂) nanosheets

et al. 2015

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ARTICLE This journal isNovel mix-phase TiO 2 nanosheets were successfully synthesized by a facile Sol-gel method via using graphene oxide (GO) as the sacrifice template for the first time. The SEM, TEM and AFM images revealed that the thickness of mix-phase TiO 2 nanosheets was ca. 66 nm, and the TiO 2 nanosheets were in a polycrystalline phase and made up of nanoparticles with the diameters of 15-25 nm. In addition, we observed that the proportion of rutile and anatase changed with the amount of tetrabutyltitanate (TBT). The results showed that the sample with 4 mL tetrabutyltitanate (TBT-4) exhibited the highest hydrogen production rate (339 µmol/h) in all samples, which was 47% higher than the bulk sample. It was mainly attributed to the surface phase junction of anatase and rutile and the special morphology of the samples.

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“…The samples were obtained by the sol-gel method, using the following, appropriately chosen alkoxides: aluminum and titanium (Al(C3H7O)3, Ti(C3H7O)4) (p.a., Avantor Performance Materials Poland S.A.) with a concentration of 1 M in anhydrous ethanol [27]. The alkoxides of aluminum and titanium were used for the preparation of the corresponding oxides, in the case of which the molar ratio (Al2O3:TiO2) was determined to be 0.75:0.25; 0.50:0.50 and 0.25:0.75.…”

Section: Methodsmentioning

confidence: 99%

Effect of Support Structure in Au/Al₂O₃-TiO₂Catalysts in Low-Temperature CO Oxidation

2016

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Abstract. The aim of this study was to determine the effect of the support phase composition (Al 2 O 3 -TiO 2 ) and the addition of gold on the catalytic properties in low-temperature CO oxidation. In this paper, the physicochemical properties and results of catalytic measurements performed for the obtained samples were investigated. The catalyst carriers were prepared using the sol-gel method with alkoxide Al(C 3 H 7 O) 3 and Ti(C 3 H 7 O) 4 employed to obtain the corresponding oxides, in the case of which the molar ratio (Al 2 O 3 :TiO 2 ) was 0.75:0.25, 0.50:0.50 and 0.25:0.75, thus corresponding to the molar ratio of the Al:Ti elements, i.e. 1.5:0.25, 2:1 and 0.5:0.75 respectively. The gold catalysts were prepared through the deposition of gold by the deposition precipitation method using the theoretical loading of Au 2 wt.%. To examine the effect of the phase composition on the catalytic activity of the obtained samples, appropriate carriers were calcined at two different temperatures: 500°C and 1350°C. This made it possible to obtain the intended polymorphs of aluminum oxide and titanium dioxide (γ-Al 2 O 3 , α-Al 2 O 3 , anatase and rutile). For certain samples, calcined at a high temperature, the aluminum titanium oxide (Al 2 O 5 Ti) phase was also observed. The prepared samples were characterized by XRD, BET, SEM, and additionally both particle size distribution analysis and measurements of the catalytic activity were performed. The highest catalytic activity was shown by Au/75Al-25Ti_LT, where T 90 was about 110°C.

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Single and mixed phase TiO₂powders prepared by excess hydrolysis of titanium alkoxide

Cited by 80 publications

References 61 publications

Preparation and Characterization of Fe3O4/SiO2/TiO2 Composite for Methylene Blue Removal in Water

Preparation and Characterization of Fe3O4/SiO2/TiO2 Composite for Methylene Blue Removal in Water

Graphene oxide-assisted synthesis and photocatalytic hydrogen production of mix-phase titanium dioxide (TiO₂) nanosheets

Effect of Support Structure in Au/Al₂O₃-TiO₂Catalysts in Low-Temperature CO Oxidation

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Single and mixed phase TiO2powders prepared by excess hydrolysis of titanium alkoxide

Cited by 80 publications

References 61 publications

Preparation and Characterization of Fe3O4/SiO2/TiO2 Composite for Methylene Blue Removal in Water

Preparation and Characterization of Fe3O4/SiO2/TiO2 Composite for Methylene Blue Removal in Water

Graphene oxide-assisted synthesis and photocatalytic hydrogen production of mix-phase titanium dioxide (TiO2) nanosheets

Effect of Support Structure in Au/Al2O3-TiO2Catalysts in Low-Temperature CO Oxidation

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Product

Resources

About

Single and mixed phase TiO₂powders prepared by excess hydrolysis of titanium alkoxide

Graphene oxide-assisted synthesis and photocatalytic hydrogen production of mix-phase titanium dioxide (TiO₂) nanosheets

Effect of Support Structure in Au/Al₂O₃-TiO₂Catalysts in Low-Temperature CO Oxidation