What is Degussa (Evonik) P25? Crystalline composition analysis, reconstruction from isolated pure particles and photocatalytic activity test

Ohtani, Bunsho; Prieto-Mahaney, Orlando-Omar; Li, D.; Abe, Ryu

doi:10.1016/j.jphotochem.2010.07.024

Cited by 835 publications

(634 citation statements)

References 19 publications

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“…These particles agglomerate forming aggregates with different shapes and morphologies, which influence the surface roughness, haze and transparency of the bulk material [26]. The approximate size of the P25 nanoparticles is between 15 and 30 nm, which is in accordance with values presented in literature [27]. Fig.…”

Section: Photocatalysts Characterizationsupporting

confidence: 88%

Synthesis and assessment of a graphene-based composite photocatalyst

Magalhães

Ângelo

Sousa

et al. 2015

Biochemical Engineering Journal

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A novel composite photocatalyst prepared from graphene and commercial TiO2 (P25 from Evonik) was synthesized, exhibiting enhanced photocatalytic activity for methylene blue degradation, when com-pared with pristine P25. Additionally, the new catalyst showed 20% more NO conversion under UV light than P25. The band gap of the catalyst, obtained from diffuse reflectance, was 2.95 eV indicating an extended light absorption up to 420 nm. The novel photocatalyst was further tested for inactivating microorganisms showing better results than the reference photocatalyst. Under visible light, the viability loss of the reference bacterial strain Escherichia coli DSM 1103 was two times higher than with the bare P25; it was observed 29% of inactivation with the P25/graphene composite and 14% with the P25 sample, following standard ISO 27447:2009.

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Section: Photocatalysts Characterizationsupporting

confidence: 88%

Synthesis and assessment of a graphene-based composite photocatalyst

Magalhães

Ângelo

Sousa

et al. 2015

Biochemical Engineering Journal

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“…The commercial photocatalyst Degussa (Evonik) P25 was used as a reference sample because of its high level of activity in various photocatalytic reactions ensuring clear discussion of the influence of reaction parameters on photocatalytic activity of DAPs [40].…”

Section: Photocatalytic Reactionsmentioning

confidence: 99%

Decahedral-shaped anatase titania photocatalyst particles: Synthesis in a newly developed coaxial-flow gas-phase reactor

Janczarek

Kowalska

Ohtani

2016

Chemical Engineering Journal

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Decahedral-shaped anatase particles (DAPs) were prepared by a gas-phase process consisting of titanium(IV) chloride oxidation. The use of a coaxial-flow gas-phase reactor resulted in high reaction yield (ca. 70%) and good reproducibility of DAPs production. The influence of controlled and resultant preparation parameters on the process course and on DAPs properties (such as specific surface area, particle size and particle morphology) is discussed in detail.Correlations between preparation parameters and product properties indicated the best conditions for obtaining DAPs of high quality and thus with a high level of photocatalytic activity for various reaction systems.Keywords: anatase titania, decahedral-shaped particles, gas-phase synthesis, coaxial-flow reactor, photocatalytic activityconcentration of TiCl 4 vapor in gas phase (vol%) amount of powder collected from the glassfiber filter (g) length of the reaction zone (m) line speed ratio of reactant gases internal pressure (kPa) particle aspect ratio primary particle size (nm) particle shape distribution (%) particle size heterogeneity radial distance (m) reaction tube radius (m) Reynolds numbersecondary particle size (nm) specific surface area (m 2 g -1 ) amount of powder collected from the reaction tube (g) furnace temperature (K) residence time (s) average volumetric flow rate of the gas mixture (m 3 s -1 ) volumetric flow rate of argon (m 3 s -1 ) volumetric flow rate of oxygen (m 3 s -1 ) volumetric flow rate of TiCl 4 vapor (m 3 s -1 ) volumetric flow rate of TiCl 4 liquid (m 3 s -1 ) viscosity of the gas mixture (Pa s) density of the gas mixture (kg m -3 )

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“…In our opinion it is more likely that the observed changes in phase composition at relatively low calcination temperature could correspond to the transformation of an amorphous phase into anatase. Ohtani et al (34) found that P25 photocatalyst contains anatase, rutile and small amount of amorphous phase. The XRD analysis does not directly confirm the presence of an amorphous phase in phase composition.…”

Section: Photocatalytic Activity Measurementsmentioning

confidence: 99%

Modification of Titanium Dioxide with Graphitic Carbon from Anthracene Thermal Decomposition as a Promising Method for Visible- Active Photocatalysts Preparation

Kusiak-Nejman

Wanag

Kowalczyk

et al. 2016

Journal of Advanced Oxidation Technologies

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Abstract:This work investigated the photocatalytic performance of TiO 2 photocatalysts modified with graphitic carbon under visible light with a very small component of UV. The graphitic carbon modification was conducted at 200-500 °C using thermal anthracene decomposition. The increase of calcination temperature leads to typical increase of crystallites size, decrease of the specific surface area and carbon content in modified samples. The characteristic peak for a skeletal in-plane vibrations of the anthracene ring located at 1522 cm -1 as well as the band at 1410 cm -1 assigned to C=C aromatic stretching vibrations mode were possible to observe. The analysis of the morphology using SEM confirmed the presence on new multi-layer carbonaceous flakes decorated with TiO 2 nanoparticles. TEM analysis and Raman studies proved the presence of graphitic structures covering the surface of the prepared TiO 2 /C photocatalysts. The highest photocatalytic activity, calculated on the basis of phenol photodegradation under visible light, was found for the photocatalyst modified with graphitic carbon at 400 °C (TiO 2 /C-400).

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What is Degussa (Evonik) P25? Crystalline composition analysis, reconstruction from isolated pure particles and photocatalytic activity test

Cited by 835 publications

References 19 publications

Synthesis and assessment of a graphene-based composite photocatalyst

Synthesis and assessment of a graphene-based composite photocatalyst

Decahedral-shaped anatase titania photocatalyst particles: Synthesis in a newly developed coaxial-flow gas-phase reactor

Modification of Titanium Dioxide with Graphitic Carbon from Anthracene Thermal Decomposition as a Promising Method for Visible- Active Photocatalysts Preparation

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