Heat treatment on TiO2 nanoparticles prepared by vapor-phase hydrolysis

Xia, Bin; Huang, Huizhong; Xie, Yongbing

doi:10.1016/s0921-5107(98)00322-5

Cited by 82 publications

(54 citation statements)

References 12 publications

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“…This process starts at about 300°C or even lower, whereas phase transformation sets in above 400°C. Xia et al [28] reported on a transformation temperature of 650°C for 17 nm TiO 2 particles in good agreement with the data shown in Fig. 3.…”

Section: Particle Synthesis and Sintering Characterizationsupporting

confidence: 88%

Distinguishing between aggregates and agglomerates of flame-made TiO2 by high-pressure dispersion

et al. 2008

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The potential of high-pressure dispersion (HPD) and dynamic light scattering (DLS) is explored for rapid and quantitative estimation of the extent of particle aggregation and agglomeration by analyzing the entire particle size distribution. Commercially available and tailor-made TiO 2 particles by flame spray pyrolysis (FSP) were characterized by X-ray diffraction, nitrogen adsorption and transmission electron microscopy (TEM). Volume distributions of these titania particles were obtained by DLS of their electrostatically stabilized (with Na 4 P 2 O 7 ) aqueous suspensions. Dispersing these suspensions through a nozzle at 200 to 1400 bar reduced the size of agglomerates (particles bonded by weak physical forces) resulting in bimodal size distributions composed of their constituent primary particles and aggregates (particles bonded by strong chemical or sinter forces). Sintering FSP-made particles from 200 to 800°C for 4 h progressively increased the minimum primary particle size (by grain growth) and aggregate size (by neck growth and phase transformation).

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Section: Particle Synthesis and Sintering Characterizationsupporting

confidence: 88%

Distinguishing between aggregates and agglomerates of flame-made TiO2 by high-pressure dispersion

et al. 2008

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“…The important role played by lower particle size to the phase transformation to rutile has been reported (Jang, 1997;Xia et al, 1999b). High rutile content (>90%) when the amorphous to rutile transformation takes place even at a temperature of 673K could be explained by the involvement of particles having the higher specific surface area (144m 2 /gm, smaller average particle size) at high molar ratios of H 2 O/ TiCl 4 .…”

Section: Discussion On the Mechanistic Interpretation Of The Decreamentioning

confidence: 81%

“…Therefore for commercial applications, aerosol processes with low cost precursors and continuous processing at lower temperature are likely to be preferred. Xia et al (1999b) prepared anatase phase titania powder by vapor phase hydrolysis of titanium tetrachloride at temperature in the range less than 873K, the samples being obtained through electrophoretic deposition.…”

Section: Introductionmentioning

confidence: 99%

Characteristics of Titania Nanoparticles Synthesized Through Low Temperature Aerosol Process

Ani

Savithri

Surender

2005

Aerosol Air Qual. Res.

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As one of the important process alternatives for the synthesis of nano materials with lower costs, flexibility and versatility, vapor phase synthesis of titania nano particles continue to attract attention.A low temperature aerosol process for the synthesis of titania nano particles is demonstrated by elucidating the influence of temperature, molar ratio of H 2 O/TiCl 4 and concentration of precursors on particle size and phase composition. This paper highlights the advantages of employing amorphous phase titania powder as solid precursor for its transformation to the rutile phase at temperatures less than 973K through vapor phase hydrolysis of TiCl 4 . A mechanistic hypothesis is proposed to explain the catalytic role of water vapor in the enhancement of amorphous to anatase phase transformation at high (15 to 27) molar ratio of H 2 O/TiCl 4 .

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“…However, the increase of treatment temperature up to 600°C resulted in considerable increase of the crystallite size of the anatase phase, considered as the most desired structure in terms of efficiency of the photocatalytic processes [28]. The presence of anatase phase is connected with the facility of efficient electron transport and the avoidance of the fast charge recombination [29]. Consequently, the presence of anatase crystalline structure influences the higher production of…”

Section: Photocatalyst Characteristicsmentioning

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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Heat treatment on TiO2 nanoparticles prepared by vapor-phase hydrolysis

Cited by 82 publications

References 12 publications

Distinguishing between aggregates and agglomerates of flame-made TiO2 by high-pressure dispersion

Distinguishing between aggregates and agglomerates of flame-made TiO2 by high-pressure dispersion

Characteristics of Titania Nanoparticles Synthesized Through Low Temperature Aerosol Process

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

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