Stabilization of anatase phase in the rare earth; Eu and Sm ion doped nanoparticle TiO2

Setiawati, Elly; Kawano, Katsuyasu

doi:10.1016/j.jallcom.2007.04.059

Cited by 69 publications

(34 citation statements)

References 15 publications

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“…This is attributed to a higher density of localised states and consequent surface-adsorbed hydroxyl radicals and slower charge carrier recombination in anatase relative to rutile [58,60,[69][70][71][72], parameters that contribute to improved performance. The higher rate of electron-hole recombination in rutile is considered to result from this material's typically larger grain size [55,73] and its resultant lower capacity to adsorb species [60,74,75].…”

Section: Photocatalytic Effectmentioning

confidence: 99%

Review of the anatase to rutile phase transformation

2010

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Titanium dioxide, TiO 2 , is an important photocatalytic material that exists as two main polymorphs, anatase and rutile. The presence of either or both of these phases impacts on the photocatalytic performance of the material. The present work reviews the anatase to rutile phase transformation. The synthesis and properties of anatase and rutile are examined, followed by a discussion of the thermodynamics of the phase transformation and the factors affecting its observation. A comprehensive analysis of the reported effects of dopants on the anatase to rutile phase transformation and the mechanisms by which these effects are brought about is presented in this review, yielding a plot of the cationic radius versus the valence characterised by a distinct boundary between inhibitors and promoters of the phase transformation. Further, the likely effects of dopant elements, including those for which experimental data are unavailable, on the phase transformation are deduced and presented on the basis of this analysis.

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Section: Photocatalytic Effectmentioning

confidence: 99%

Review of the anatase to rutile phase transformation

2010

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“…Doping techniques have been shown to be effective and efficient despite their being susceptible to thermal instability and their requirement for expensive ionimplantation facilities [28]. Dopants are valued for their ability to confer excellent physicochemical properties such as high crystallinity (high percentage of anatase phase), high specific surface area, and small crystallite size [20,29]. There are three types of crystalline phases of nano-TiO 2 , namely, the rutile, anatase, and brookite phases.…”

Section: Effects Of Dopants In the Formation Ofmentioning

confidence: 99%

“…Besides shifting the wavelength sensitivity of nanodoped-TiO 2 into the visible light range, doping techniques can also improve the physical properties of TiO 2 . Cai et al [19,20] reported that suitable amounts of dopants helped to control the crystallite size of nano-doped-TiO 2 while producing a high specific surface area of nano-doped-TiO 2 . A judicious rate of doping also prevented the transformation of the anatase phase to the rutile phase.…”

Section: Introductionmentioning

confidence: 99%

An Overview on the Photocatalytic Activity of Nano-Doped-TiO2 in the Degradation of Organic Pollutants

Tan

Wong

Mohamed

2011

ISRN Materials Science

111

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This paper aims to review and summarize the recent works on the photocatalytic degradation of various organic pollutants in the presence of nano-doped-TiO 2 photocatalysts. In this regard, three main aspects are examined: (a) the presence of various dopants (metal dopants, nonmetal dopants, halogen dopants, metalloid dopants, and codopants) in the formation of nano-doped-TiO 2 photocatalysts, (b) the effect of the presence of dopants on the photocatalytic degradation of organic pollutants, and (c) the effects of various operating parameters on the photocatalytic degradation of organic pollutants in the presence of nano-doped-TiO 2 photocatalysts. Reports resulted suggest that the formation of a high percentage of the anatase phase, small crystallite size, and high specific surface area of the nano-doped-TiO 2 photocatalysts depends on the presence of various dopants in the photocatalysts. The majority of the dopants have the potential to improve the photocatalytic efficiency of nano-doped-TiO 2 in the degradation of organic pollutants. The photocatalytic degradation of organic compounds depends on the calcination temperature of the prepared doped TiO 2 , initial reactant concentration, dosage of doped TiO 2 , and dopant doping concentration.

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“…According to the previous studies, the photocatalytic performance of the anatase form of titania generally is considered superior to that of the more stable rutile, which is attributed to a higher density of localized states and consequent surface-adsorbed hydroxyl radicals and slower charge carrier recombination in anatase relative to rutile [14][15][16][17]. XRD profiles of Pt-deposited TiO 2 and pure TiO 2 samples are depicted in Fig.…”

Section: Resultsmentioning

confidence: 95%

Visible light-induced photocatalysis through surface plasmon excitation of platinum-metallized titania for photocatalytic bleaching of rhodamine B

Zhang

2011

Monatsh Chem

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Nanocomposites consisting of titania nanoparticles and metallic platinum were prepared via a soft chemical reduction method. The detailed structural, compositional, and optical characterization and physicochemical properties of the obtained products were analyzed by X-ray diffraction, nitrogen adsorption, Raman spectroscopy, UV-Vis diffuse reflectance spectroscopy, photoluminescence spectroscopy, and FT-IR spectroscopy techniques. Employing photodegradation of rhodamine B as the model reaction, we found that the as-prepared Pt/TiO 2 nanocomposite showed an excellent photocatalytic oxidation activity under visible light irradiation. On the basis of these results, the intrinsic mechanism of visible light-induced photocatalytic oxidation of organic compounds on the platinized titania is proposed and discussed. The superior visible lightdriven photocatalytic efficiency of the Pt/TiO 2 nanocomposite photocatalyst can be ascribed to the high efficiency of charge-pair separation due to the presence of deposited Pt serving as electron sinks to retard the rapid e --h ? couple recombination; the good photoabsorption capacity in the visible light region; and the higher concentration of surface hydroxyl groups, which are able to effectively scavenge photogenerated valence band holes. Accumulation of the holes at the catalyst surface increases the probability of the formation of OHÁ as a reactive species that readily oxidizes the organic dye molecule.

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Stabilization of anatase phase in the rare earth; Eu and Sm ion doped nanoparticle TiO2

Cited by 69 publications

References 15 publications

Review of the anatase to rutile phase transformation

Review of the anatase to rutile phase transformation

An Overview on the Photocatalytic Activity of Nano-Doped-TiO2 in the Degradation of Organic Pollutants

Visible light-induced photocatalysis through surface plasmon excitation of platinum-metallized titania for photocatalytic bleaching of rhodamine B

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