Pressure–temperature phase diagrams of pure and Ag-doped nanocrystalline TiO2 photocatalysts

Stir, M.; Nicula, R.; Burkel, E.

doi:10.1016/j.jeurceramsoc.2005.03.260

Cited by 26 publications

(22 citation statements)

References 22 publications

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“…400-1100 nm) and noticed that the temperature of transition to rutile appears to be higher. Thus, the thermodynamic model of Mayo et al (2003) helps to reconcile the results obtained on nanocrystalline titania (Stir et al 2006) with ours.…”

Section: Resultssupporting

confidence: 85%

“…Our experiments were not aimed at pinpointing fields of stability of the TiO 2 phases, and they essentially agree with what the phase diagram for nanocrystalline TiO 2 predicts for ambient pressure (Stir et al 2006), but shifted to higher temperatures by several tens of degrees.…”

Section: Resultssupporting

confidence: 71%

“…Analogously, a lower temperature is shown in the phase diagram for nanocrystalline titania (average particle size approx. 80 nm; Stir et al 2006), whereas in runs s750, s850, s900 we observed a significantly coarser particle size (approx. 400-1100 nm) and noticed that the temperature of transition to rutile appears to be higher.…”

Section: Resultsmentioning

confidence: 67%

“…Stir et al 2006). A related research direction is using titania for pillaring clay minerals in order to open up their interlayer spaces and thus increase their surface area (Yamanaka et al 1987).…”

Section: Introductionmentioning

confidence: 99%

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High-temperature growth of anatase on kaolinite substrate

2009

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When a fine fraction of kaolinite (less than 2 μm) is mixed with titanyl sulphate (weight ratio approx. 1 : 7), hydrolysed, washed, dried and heated to temperatures between 750 and 900• C, it transforms into metakaolin, and titania crystallizes as anatase with a small particle size (approx. 20-30 nm). In parallel experiments with plain titania (without kaolinite), rutile is the sole product phase at 850 and 900• C and the dominant phase in a mixture with anatase at 750• C. The particle sizes are much larger (approx. 400-1100 nm). It appears that kaolinite is instrumental in preserving titania in the anatase form and with a small particle size even at fairly high temperatures and hindering its transformation to rutile. However, this anatase exhibits poor photocatalytic activity.

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Section: Resultssupporting

confidence: 85%

Section: Resultssupporting

confidence: 71%

Section: Resultsmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

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High-temperature growth of anatase on kaolinite substrate

2009

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“…Details on the high-pressure equipment and typical experimental procedures can be found in Ref. [4]. The applied pressure was calibrated using the Decker NaCl equation of state [5].…”

Section: Methodsmentioning

confidence: 99%

In Situ Energy Dispersive X-Ray Diffraction Analysis of the Temperature-Pressure Stability of Co-Fe-(Ta, W)-B Alloys

et al. 2008

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In this work two Co53.5Fe10X5.5B31 (X = Ta, W) alloys were synthesized from high purity (≥ 99.9%) powder elements by means of mechanical alloying. In case of Ta-addition, mechanical alloying resulted in formation of two component material with nanocrystalline phase embedded in amorphous matrix. On the other hand, substitution of Ta by W retards partial amorphization induced by mechanical alloying. High pressure-temperature stability of both alloys was monitored using in situ energy dispersive X-rays.

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Photocatalytic Degradation of Organic Pollutants by Using Nanocrystalline Boron‐doped TiO₂ Catalysts

et al. 2021

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In this work, bare or mixed environmentally non-benign organic pollutants have been decontaminated using borondoped TiO 2 nanoparticles (B@TiO 2 ). B@TiO 2 nanoparticles (NPs) with varying content of boron (0.0 to 7.0 mol %) are synthesized using sol-gel method. These NPs are characterized by using different tools. XRD reveals the high crystalline nature with formation of anatase phase and also shows slight increase in crystallite size with increase in boron content in TiO 2 host lattice. The optical shift towards higher wavelength increases with increase of boron doping and hence corresponding decrease in optical band gap of doped NPs is confirmed. FTIR and TGA studies reveal the increase of surface hydroxylation of NPs with increase in dopant content. B@TiO 2 samples have been used for the photocatalytic degradation of bisphenol A, rhodamine B, methylene blue, methyl orange and mixture of these three dyes under sunlight illumination. 7.0 mol % B@TiO 2 has shown the best activity than other prepared samples. Rate of degradation of mixed dyes using 7.0 mol % B@TiO 2 is about seven times higher to that of bare TiO 2 and also shown higher rate than other doped samples.

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Pressure–temperature phase diagrams of pure and Ag-doped nanocrystalline TiO2 photocatalysts

Cited by 26 publications

References 22 publications

High-temperature growth of anatase on kaolinite substrate

High-temperature growth of anatase on kaolinite substrate

In Situ Energy Dispersive X-Ray Diffraction Analysis of the Temperature-Pressure Stability of Co-Fe-(Ta, W)-B Alloys

Photocatalytic Degradation of Organic Pollutants by Using Nanocrystalline Boron‐doped TiO₂ Catalysts

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Pressure–temperature phase diagrams of pure and Ag-doped nanocrystalline TiO2 photocatalysts

Cited by 26 publications

References 22 publications

High-temperature growth of anatase on kaolinite substrate

High-temperature growth of anatase on kaolinite substrate

In Situ Energy Dispersive X-Ray Diffraction Analysis of the Temperature-Pressure Stability of Co-Fe-(Ta, W)-B Alloys

Photocatalytic Degradation of Organic Pollutants by Using Nanocrystalline Boron‐doped TiO2 Catalysts

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Photocatalytic Degradation of Organic Pollutants by Using Nanocrystalline Boron‐doped TiO₂ Catalysts