Effects of Nb doping on the TiO2 anatase-to-rutile phase transition

Arbiol, Jordi; Cerdá, J.; Dezanneau, G.; Cirera, A.; Peiró, Francesca; Cornet, A.; Morante, J.R.

doi:10.1063/1.1487915

Cited by 312 publications

(213 citation statements)

References 35 publications

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“…Hence it can be concluded that Zn 2+ dopant stabilised the anatase phase mainly by decreasing the anatase grain growth. While the higher valent vanadium ion decreases the concentration of oxygen vacancies for charge compensation preventing the nucleation necessary for rutile growth [9,13]. It is reported that in the case of metal oxides there is critical value of dispersion capacity, at values lower than which the oxide might become highly dispersed on the support without the formation of a separate crystalline phase.…”

Section: Resultsmentioning

confidence: 99%

Photocatalytic activity of TiO2 doped with Zn2+ and V5+ transition metal ions: Influence of crystallite size and dopant electronic configuration on photocatalytic activity

Devi

Murthy

Kumar

2010

Materials Science and Engineering: B

150

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a b s t r a c tAnatase TiO 2 was prepared by sol-gel method through the hydrolysis of titanium tetrachloride and doped with transition metal ions like V 5+ and Zn 2+ . The photocatalysts were characterized by various analytical techniques. Powder X-ray diffraction studies revealed only anatase phase for the doped samples. The band gap absorption for the doped samples showed red shift to the visible region (∼456 nm) as confirmed by UV-vis absorption spectroscopy and diffuse reflectance spectral studies. The surface area of the Zn 2+ doped samples were higher than the V 5+ doped samples as observed by BET surface area measurements due to their smaller crystallite size. Scanning electron microscopy showed almost similar morphology, while energy dispersive X-ray analysis confirmed the presence of dopant in the TiO 2 matrix. The photocatalytic activities of these catalysts were tested for the degradation of Congo Red under solar light. Although both the doped samples showed similar red shift in the band gap, Zn 2+ (0.06 at.%) doped TiO 2 showed enhanced activity and its efficiency was five fold higher compared to Degussa P-25 TiO 2 . This enhanced activity was attributed to smaller crystallite size and larger surface area. Further completely filled stable electronic configuration (d 10 ) of Zn 2+ shallowly traps the charge carriers and detraps the same to the surface adsorbed species thereby accelerating the interfacial charge transfer process.

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Section: Resultsmentioning

confidence: 99%

Photocatalytic activity of TiO2 doped with Zn2+ and V5+ transition metal ions: Influence of crystallite size and dopant electronic configuration on photocatalytic activity

Devi

Murthy

Kumar

2010

Materials Science and Engineering: B

150

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“…Quantification of phase proportions usually is carried out by X-ray diffraction (XRD) [1,78,81,105,[120][121][122][123][124][125]. Such analyses often are done using the method of Spurr and Myers [126], which utilises the ratio of the rutile (110) peak at 27.355°2h to the anatase (101) peak at 25.176°2h.…”

Section: X-ray Diffractionmentioning

confidence: 99%

“…Laser Raman microspectroscopy also has been employed effectively to differentiate the anatase and rutile [25,80,124,[130][131][132][133]. The titania polymorphs exhibit distinct Raman spectra that can be used for qualitative and quantitative mineralogical analysis.…”

Section: Laser Raman Microspectroscopymentioning

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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“…To date, just a few reports have been published, which refer to this transformation and most of them perform their transformation research in regions above 800 K [27,28]. The level of phase transformation depends on different parameters, such as initial phase, reacting ambience, annealing temperature, and particle size [29][30][31].…”

Section: Introductionmentioning

confidence: 99%

Mixed Phase Anatase/rutile Titanium Dioxide Nanotubes for Enhanced Photocatalytic Degradation of Methylene-blue

Boehme

Ensinger

2011

Nano-Micro Lett.

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Titanium dioxide Nanotubes (TNTs) prepared by electroless deposition have been annealed at air ambient and low temperature. As a result, the anatase/rutile phase composition of the TNTs can be tailored to the needs of later applications. Nanotubes with anatase/rutile mixed phase ratio of 4:1 have been produced in this report and further examined for their photocatalytical behavior. The photocatalytical properties of the TNTs have been observed by degradation of methylene-blue in aqueous solution under low power UV-light irradiation. The results shown in this report are based on the synergetic effect between rutile and anatase, which results in the mixed phase TiO2 nanotubes having enhanced photocatalytical properties.

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Effects of Nb doping on the TiO2 anatase-to-rutile phase transition

Cited by 312 publications

References 35 publications

Photocatalytic activity of TiO2 doped with Zn2+ and V5+ transition metal ions: Influence of crystallite size and dopant electronic configuration on photocatalytic activity

Photocatalytic activity of TiO2 doped with Zn2+ and V5+ transition metal ions: Influence of crystallite size and dopant electronic configuration on photocatalytic activity

Review of the anatase to rutile phase transformation

Mixed Phase Anatase/rutile Titanium Dioxide Nanotubes for Enhanced Photocatalytic Degradation of Methylene-blue

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