Photoactivity of anatase–rutile TiO2 nanocrystalline mixtures obtained by heat treatment of homogeneously precipitated anatase

Bakardjieva, Snejana; Šubrt, Ján; Štengl, Václav; Diánez, M. J.; Sayagués, María Jesús

doi:10.1016/j.apcatb.2004.06.019

Cited by 348 publications

(233 citation statements)

References 23 publications

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“…Many researchers [42][43][44][45][46][47] indicated that mixed phases of anatase and rutile exhibited higher photocatalytic activity than pure anatase and rutile phase, and attributed the enhancement of photoactivity to synergistic effect between anatase and rutile. Based on the results of EPR, Hurum et al [45] published explanation of high photocalytic activity of anatase-rutile mixtures represented by the Degussa P25 TiO 2 .…”

Section: Evaluation Of Photocatalytic Activitymentioning

confidence: 99%

Photocatalytic activity for H2 evolution of TiO2 with tuned surface crystalline phase

Zhang

Shi

Zhao

et al. 2013

Applied Surface Science

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Section: Evaluation Of Photocatalytic Activitymentioning

confidence: 99%

Photocatalytic activity for H2 evolution of TiO2 with tuned surface crystalline phase

Zhang

Shi

Zhao

et al. 2013

Applied Surface Science

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“…32 Bakardjieva et al showed the formation of TiO 2 nanocrystals from titanyloxychloride by using urea as a precipitating agent. 33 Also there are recent reports published which explain the visible light activity of titania by doping with nitrogen where urea or thiourea is used as a precursor. [34][35][36][37] However, there is no systematic study available in the literature on the effect of various concentrations of urea on high temperature stability of anatase.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of High-Temperature Stable Anatase TiO₂ Photocatalyst

et al. 2007

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In the absence of a dopant or precursor modification, anatase to rutile transformation in synthetic TiO 2 usually occurs at a temperature of 600 ºC to 700 ºC. Conventionally, metal oxide dopants (e.g. Al 2 O 3 and SiO 2 ) are used to tune the anatase to rutile transformation. A simple methodology is reported here to extend the anatase rutile transformation by employing various concentrations of urea.XRD and Raman spectroscopy were used to characterize various phases formed during thermal treatment. A significantly higher anatase phase (97%) has been obtained at 800 ºC using a 1:1 (Ti (OPr) 4 : urea) composition and 11% anatase composition is retained even after calcining the powder at 900 ºC. On comparison a sample which has been prepared without urea showed that rutile phases started to form at a temperature as low as 600 °C. The effect of smaller amounts of urea such as 1:0.25 and 1:0.5 (Ti (OPr) 4 :urea) has also been studied and compared. The investigation concluded that the stoichiometric modification by urea 1:1 (Ti (OPr) 4 :urea) composition is most effective in extending the anatase to rutile phase transformation by 200 ºC compared to the unmodified samples. In addition, BET analysis carried out on samples calcined at 500 °C showed that the addition of urea up to 1:1 (Ti (OPr) 4 :urea) increased the total pore volume (from 0.108 cm 3 /g to 0.224 cm 3 /g) and average pore diameter (11 nm to 30 nm) compared to the standard sample. Samples prepared using 1:1 (Ti (OPr) 4 :urea) composition calcined at 900 ºC show significantly higher photocatalytic activity compared to the standard sample prepared under similar conditions. Kinetic analysis shows a marked increase in the photocatalytic degradation of rhodamine 6G on going from the standard sample (0.016 min , decoloration in 50 mins).

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“…Commercial titania P25 (Evonik Industries AG, Germany) with the specific surface area of 55 m 2 /g and the crystallite size of 21 nm for anatase (78.8 %) and 31 nm for rutile (21.2 %) was used as a reference material [18]. In many papers, it was reported that P25 nanopowder shows considerable inhomogeneity in the case of phase composition and crystallite sizes [18][19][20][21].…”

Section: Methodsmentioning

confidence: 99%

Induced self-cleaning properties towards Reactive Red 198 of the cement materials loaded with co-modified TiO2/N,C photocatalysts

Janus

Bubacz

Zatorska

et al. 2014

Reac Kinet Mech Cat

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The possibility of promoting the self-cleaning properties of the cement materials was verified by implementing the obtained nitrogen and carbon comodified titania-based (TiO 2 /N,C) photocatalysts into the cement plates. Additionally, unmodified TiO 2 (Grupa Azoty Zakłady Chemiczne POLICE S.A., Poland) and a commercial photocatalyst P25 (Evonik Industries AG, Germany) were used as reference materials. The impact of treatment temperature on the physicochemical properties of the obtained TiO 2 /N,C additives was discussed. The photocatalytic activity of the prepared cement plates was evaluated trough the degradation of a model organic compound (Reactive Red 198) under UV-vis light. It was found that cement plates containing TiO 2 /N,C photocatalyst calcined at 600°C temperature exhibited the highest photocatalytic activity. The role of several factors such as crystallinity, phase composition and non-metals presence in the TiO 2 /N,C additives on the self-clearing properties of the cement samples was also included in the discussion.

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Photoactivity of anatase–rutile TiO2 nanocrystalline mixtures obtained by heat treatment of homogeneously precipitated anatase

Cited by 348 publications

References 23 publications

Photocatalytic activity for H2 evolution of TiO2 with tuned surface crystalline phase

Photocatalytic activity for H2 evolution of TiO2 with tuned surface crystalline phase

Synthesis of High-Temperature Stable Anatase TiO₂ Photocatalyst

Induced self-cleaning properties towards Reactive Red 198 of the cement materials loaded with co-modified TiO2/N,C photocatalysts

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Photoactivity of anatase–rutile TiO2 nanocrystalline mixtures obtained by heat treatment of homogeneously precipitated anatase

Cited by 348 publications

References 23 publications

Photocatalytic activity for H2 evolution of TiO2 with tuned surface crystalline phase

Photocatalytic activity for H2 evolution of TiO2 with tuned surface crystalline phase

Synthesis of High-Temperature Stable Anatase TiO2 Photocatalyst

Induced self-cleaning properties towards Reactive Red 198 of the cement materials loaded with co-modified TiO2/N,C photocatalysts

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Product

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Synthesis of High-Temperature Stable Anatase TiO₂ Photocatalyst