Hydrothermal synthesis of nanosized anatase and rutile TiO2 using amorphous phase TiO2

Yin, Hengbo; Wada, Yuji; Kitamura, Takayuki; Kambe, Shingo; Murasawa, Sadao; Mori, Hirotarô; Sakata, Takao; Yanagida, Shozo

doi:10.1039/b008974p

Cited by 537 publications

(366 citation statements)

References 27 publications

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“…2 and Table 3) The crystallite sizes of the Cu-doped TiO 2 samples are different from their particle sizes estimated from the SEM images. The crystallite size depends on the rates of the phase transition of the systems or the nucleation and nuclear growth during heating [20,21].…”

Section: Resultsmentioning

confidence: 99%

Preparation of Cu-doped TiO2 via refluxing of alkoxide solution and its photocatalytic properties

et al. 2011

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Cu-doped TiO 2 was prepared by the refluxing of a mixture of copper and titanium alkoxides. The refluxing improved the Cu 2+ dispersion in the TiO 2 and formed effective Ti-O-Cu bonds. The impurity states due to the highly dispersed Cu 2+ were presumed to trap the electrons in the conduction band of the TiO 2 and prevent charge recombination of the electrons and holes. Consequently, the prolonged charge separation duration was suggested to enhance the photocatalytic activity of the Cu-doped TiO 2 . This enhancement was confirmed by the hydroxyl radical generation and organic compound degradation. The Ti-O-Cu bonds and electronic interaction between Cu and Ti should effectively promote the electron trapping.The Cu-doped TiO 2 exhibited a visible light-induced activity due to the transition from the TiO 2 valence band to the Cu 2+ impurity states.

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Section: Resultsmentioning

confidence: 99%

Preparation of Cu-doped TiO2 via refluxing of alkoxide solution and its photocatalytic properties

et al. 2011

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“…However, in some cases, nitric acid also prevents polymerization or crystallization, because it remains in the samples. Hydrochloric acid enhances the nucleation of TiO 2 compared with nitric acid [24]. Hydrochloric acid is easily evaporated after promoting the rearrangement of TiO 6 octahedra.…”

Section: Characterization Of the Photocatalystsmentioning

confidence: 99%

“…On the other hand, the specific surface area decreased and then increased with increasing amount of added nitric acid. Crystallite size depends on rate of the phase transition of the systems during heating and on the acidity, i.e., on the structure of the precursors [24]. The particles consist not only of crystalline phases but also of amorphous phases with an agglomerating property [25].…”

Section: Characterization Of the Photocatalystsmentioning

confidence: 99%

Nitrogen doping into titanium dioxide by the sol–gel method using nitric acid

et al. 2011

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N-doped TiO 2 has been prepared by use of sol-gel systems containing titanium alkoxide, with nitric acid as the nitrogen source.The time needed for gelation of the systems was drastically reduced by ultrasonic irradiation. The peaks assigned to the nitrate and nitrous ions were observed by FT-IR measurement during the sol-gel reaction. The N-doping was confirmed by observation of N-O peaks in the XPS spectrum of the sample heated at 400 °C.The nitrate ion acted as an oxidizer of the ethanol solvent and titanium species. The TiO 2 became doped with nitrogen oxide species were doped as a result of reduction of nitrate ion incorporated into the dried gel samples. These results indicated that the added nitric acid was reduced during the sol-gel transition and heating process, and the resulting NO species were situated in the titania networks. The UV and visible photocatalytic activity of the samples was confirmed by the degradation of trichloroethylene.

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“…The material properties of TiO 2 nanoparticles are a function of the crystal structure, nanoparticle size, and morphology. For example, anatase crystals with regular crystal surfaces have a higher photocatalytic activity than those with irregular crystal surface 2 . Furthermore, the photocatalytic activity of nanocrystalline anatase is greater than that of rutile 2 , where the activity of nanocrystalline rutile increases with decrease in particle size 2,3 .…”

Section: Introductionmentioning

confidence: 99%

Kinetic Model for Nanocrystalline Anatase to Rutile Polymorphic Transformation

Shakibania¹

2017

Chem.Biochem.Eng.Q.

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In this paper, kinetic models are presented for phase transformation from anatase to rutile in nanocrystalline samples at different temperature ranges. The models, in which the nucleation and growth are considered together, are able to predict the polymorphic transformation behavior of titania with better accuracy. In addition to researchers' assumption that phase transformation of nanocrystalline anatase to rutile at lower temperatures occurs only with interface nucleation, the results reveal that the surface nucleation can also have a significant role in the kinetics of phase transformation in conditions of prolonged heating. In comparison to other published models, the advantage of these models is that no experimental data regarding the size of particles is required to study the kinetics of phase transformation of TiO 2 nanoparticles.

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Hydrothermal synthesis of nanosized anatase and rutile TiO2 using amorphous phase TiO2

Cited by 537 publications

References 27 publications

Preparation of Cu-doped TiO2 via refluxing of alkoxide solution and its photocatalytic properties

Preparation of Cu-doped TiO2 via refluxing of alkoxide solution and its photocatalytic properties

Nitrogen doping into titanium dioxide by the sol–gel method using nitric acid

Kinetic Model for Nanocrystalline Anatase to Rutile Polymorphic Transformation

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