Sonochemical synthesis of nanostructured anatase and study of the kinetics among phase transformation and coarsening as a function of heat treatment conditions

González-Reyes, Leonardo; Hernández-Pérez, I.; Hernández, Francisco C. Robles; Dorantes-Rosales, Héctor J.; Arce-Estrada, E.M.

doi:10.1016/j.jeurceramsoc.2007.10.013

Cited by 21 publications

(7 citation statements)

References 33 publications

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“…Other authors have indicated that the presence of defects determines the particle size at which the transformation of anatase to rutile occurs. In addition to this, the critical particle size for which anatase transforms to rutile varies with calcination temperature [33]. Thus, most studies reveal that particle size is a key parameter in controlling this thermodynamic transformation.…”

Section: Structural and Surface Area Characterization Studiesmentioning

confidence: 99%

Photocatalytic degradation of phenolic compounds with new TiO2 catalysts

Araña

Doña-Rodrı́guez

Portillo-Carrizo

et al. 2010

Applied Catalysis B: Environmental

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Section: Structural and Surface Area Characterization Studiesmentioning

confidence: 99%

Photocatalytic degradation of phenolic compounds with new TiO2 catalysts

Araña

Doña-Rodrı́guez

Portillo-Carrizo

et al. 2010

Applied Catalysis B: Environmental

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“…Thus, one could consider two competitive processes in the nanocrystalline anatase powders thermally treated at a higher temperature: grain growth and phase transformation, both occurring more readily in smaller grain samples. Therefore, the coarsening mechanism can be analyzed as two kinetic domains, the first domain anatase has two functions, (1) coarse and (2) transform to rutile, in second domain, rutile phase is identified and has the sole function of coarsening progressively [14][15][16]. In Table 1…”

Section: Resultsmentioning

confidence: 99%

Relationship between the Bandgap and Electrochemical Behavior on TiO2 Nanoparticles Prepared Sonochemically

González-Reyes

Hernández-Pérez

Arceo

et al. 2011

MSF

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Nanocristalline TiO2 obtained by a facile and environment-friendly sonochemical method was subjected to thermal treatment in the temperature range of 400-900 °C in order to produce variable anatase-rutile phases ratio. The relationship between the optical bandgap and the electrochemical behavior was studied. All the stages of phase transformation of the as-prepared sample such as: nucleation, growth and coarsening were characterized by X-ray diffraction (XRD) and transmission electron microscopy (TEM). It was found that phase transformation mechanism stems from the redistribution of energy in the system and a critical particle size. On the other hand, the samples were characterized by UV-vis spectroscopy for the bandgap studies. The optical band gap of as-prepared sample increases to 3.31 eV with respect to 3.20 eV for bulk-anatase. This expansion could be attributed to quantum size effect. The i-E characteristics of samples with variable anatase-rutile ratio were obtained using cyclic voltammetry technique in a 0.5 M H2SO4 solution at room temperature. The foremost charge magnitude was obtained when anatase had a critical size of 17 nm. Analyzing both particle size for anatase and rutile, we observed that when rutile is the dominating phase and its size difference larger in 35% than anatase, the current reaches its minimum values. Based on electrochemical results, the optimal particle size and content phases control are important in order to obtain an increase in the electrochemical performance in the Hydrogen Evolution Reaction (HER) zone

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“…Figure 6 shows the X-ray diffraction patterns obtained for pure titanium oxide (T0500) and for the sulfated titanium oxides (T10500, T15500 and T20500) calcined at 500˚C. [53]. Average crystal sizes were calculated using the Scherrer equation to quantify line broadening on the most intense (101) anatase peak, and results are plotted in Figure 7 as a function of sulfate content.…”

Section: Textural Propertiesmentioning

confidence: 99%

Synthesis of Solid Acid Catalysts Based on TiO2- SO42-and Pt/TiO2- SO42- Applied in n-Hexane Isomerization

Enríquez¹,

Lajas²,

García-Alamilla³

et al. 2013

OJMetal

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The physicochemical properties and catalytic activity of pure and sulfated titanium oxide (TiO 2 and 2 4 2 TiO-SO ) is described in this work. Titanium hydroxide synthesized by the sol-gel method was impregnated with a 1 N H 2 SO 4 solution, varying amount of sulfate ions (4 SO) in the range from 10 to 20 wt%. Pure and modified hydroxides were calcined at 500˚C for 3 h and then characterized by TGA-DTG, XRD, BET, FT-IR, potentiometric titration with n-butylamine and 2-propanol dehydration. Catalytic activity of materials was tested in the n-hexane isomerization at 350˚C. The results showed that TiO 2 and 2 4 2 Ti 2 O-SO  mainly developed anatase phase. All have acceptable specific surface area (95-105 m 2 /g). Potentiometric titration with n-butylamine revealed that 2 4 2 2 4  2-SO TiO-SO TiO  showed higher acidity (430-530 mV) than compared to pure TiO 2 (−15 mV), indicating that this oxide only has weak acidity. The results showed good relationship between acidity determined by potentiometric titration with n-butylamine and the catalytic activity evaluated by 2-propanol dehydration and n-hexane isomerization. Titanium oxide with 20 wt% of ions was the material that demonstrated the highest catalytic activity for both reactions.

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Sonochemical synthesis of nanostructured anatase and study of the kinetics among phase transformation and coarsening as a function of heat treatment conditions

Cited by 21 publications

References 33 publications

Photocatalytic degradation of phenolic compounds with new TiO2 catalysts

Photocatalytic degradation of phenolic compounds with new TiO2 catalysts

Relationship between the Bandgap and Electrochemical Behavior on TiO<sub>2</sub> Nanoparticles Prepared Sonochemically

Synthesis of Solid Acid Catalysts Based on TiO<sub>2</sub>- SO<sub>4</sub><sup>2-</sup>and Pt/TiO<sub>2</sub>- SO<sub>4</sub><sup>2-</sup> Applied in <i>n</i>-Hexane Isomerization

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Sonochemical synthesis of nanostructured anatase and study of the kinetics among phase transformation and coarsening as a function of heat treatment conditions

Cited by 21 publications

References 33 publications

Photocatalytic degradation of phenolic compounds with new TiO2 catalysts

Photocatalytic degradation of phenolic compounds with new TiO2 catalysts

Relationship between the Bandgap and Electrochemical Behavior on TiO<sub>2</sub> Nanoparticles Prepared Sonochemically

Synthesis of Solid Acid Catalysts Based on TiO&lt;sub&gt;2&lt;/sub&gt;- SO&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;2-&lt;/sup&gt;and Pt/TiO&lt;sub&gt;2&lt;/sub&gt;- SO&lt;sub&gt;4&lt;/sub&gt;&lt;sup&gt;2-&lt;/sup&gt; Applied in &lt;i&gt;n&lt;/i&gt;-Hexane Isomerization

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Synthesis of Solid Acid Catalysts Based on TiO<sub>2</sub>- SO<sub>4</sub><sup>2-</sup>and Pt/TiO<sub>2</sub>- SO<sub>4</sub><sup>2-</sup> Applied in <i>n</i>-Hexane Isomerization