Low-Temperature Synthesis of Nanometer-Sized Crystalline TiO2 Particles and Their Photoinduced Decomposition of Formic Acid

Ito, Satoshi; Inoue, Shigeto; Kawada, Hiromi; Hara, Masayoshi; Iwasaki, Mitsunobu; Tada, Hiroaki

doi:10.1006/jcis.1999.6275

Cited by 89 publications

(51 citation statements)

References 17 publications

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“…The use of this molecule is suggested by Davydov and Smirniotis (2000) and Ito et al (1999). The formation of bicarbonate ion may be considered, although the air flow supplying oxygen to the solution is capable of stripping the carbon dioxide generated, keeping the bicarbonate concentration insignificant due to the shift in equilibrium (Equation 2).…”

Section: Test Molecule: Formic Acidmentioning

confidence: 99%

A comparison between bulk and supported TiO2 photocatalysts in the degradation of formic acid

Torres

Azevedo

Resende

et al. 2007

Braz. J. Chem. Eng.

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-The photocatalytic activity of bulk and supported TiO 2 catalysts were tested using formic acid as a probe molecule. The supported catalysts tested were prepared by impregnation using aluminum oxide (Al 2 O 3 ) as the support and the bulk catalysts by precipitation, both in sol-gel systems. For purposes of comparison, a photocatalyst supplied by DEGUSSA (P25) was also tested. The photolysis rate was found to be less significant than the photocatalytic rate. The Langmuir-Hinshelwood model was adopted and its constants were estimated and used to compare the various catalysts. The supported catalysts showed no significant activity, in spite of their high specific surface area. The bulk catalysts tested showed the highest photocatalytic rates. The adsorption constants determined experimentally were different from the ones estimated based on the kinetic experiments. The parameter estimation procedures tested were used to clarify this issue.

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Section: Test Molecule: Formic Acidmentioning

confidence: 99%

A comparison between bulk and supported TiO2 photocatalysts in the degradation of formic acid

Torres

Azevedo

Resende

et al. 2007

Braz. J. Chem. Eng.

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show abstract

“…7). The absorption peak at 1620 cm À1 in each spectrum below 400 C was due to physisorbed H 2 O molecules ((H 2 O)), 11,24) while the absorption peaks from 1280-1450 cm À1 that form at 300 C and 400 C can be identified as the vibrations of carbonates and bicarbonates. 25) These are the thermal decomposition products of organic residuals.…”

Section: Ftir and Uv-vis Spectramentioning

confidence: 99%

“…8,9) These in turn are controlled through precise synthesis of the semiconductor. 10) For example, Ito et al 11) reported the water-to-ethanol ratio was the key factor controlling crystallinity of the as-grown titania nanoparticles. Moreover, there are contradictory reports of the most active photocatalytic phase -the semiconductor band gaps of bulk anatase and rutile are 3.2 eV and 3.0 eV respectively -due to factors ranging from surface chemistry to quantum effects to incomplete characterization.…”

Section: Introductionmentioning

confidence: 99%

Controlled Nanophase Development in Photocatalytic Titania

Hon

White

et al. 2003

Mater. Trans.

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Acid catalyzed hydrolysis of titanium butoxide was used to synthesize homogenous titania gels, which were converted to the anatase and rutile polytypes through controlled firing. The mechanism of this phase transformation was investigated by quantitative powder X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HRTEM). Condensation to titania is a function of annealing time, temperature and atmosphere. In air, calcinations below 600 C favored the formation of anatase, with rutile only appearing at >600 C. However, in situ transformation where titania nanoparticles were treated under vacuum in the TEM required heating at higher temperatures up to 900 C. This is may be due to the formation of surface layers of reduced titanium oxide that passivate and retard the anatase to rutile transformation. Grain growth and specific surface area varied inversely, with especially rapid crystallization observed at and beyond the transformation temperature. Potential photocatalytic activity was identified with ultraviolet-visible (UV-Vis) spectroscopy. A red shift of the absorption edge for nano-titania was observed due to quantum size effects.

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“…It is noted that the amount of dye absorbed for TiO 2 increases with the film thickness. The photocurrent generated by the solar cell is directly proportional to the amount of the dye adsorbed on TiO 2 film [33]. This explains that more dye molecules are attached to the increased surface of TiO 2 .…”

Section: The Influence Of Tio 2 Multilayer (Number Of Layer) Towarmentioning

confidence: 99%

The Basic Research on the Dye-Sensitized Solar Cells (DSSC)

Zulkifili¹,

Kento²,

Daiki³

et al. 2015

JOCET

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Abstract-The dye-sensitized solar cell (DSSC) is a new type of solar cell which converts the visible light into electricity by using the photoelectrochemical system. It is based on the sensitization of the wide band gap semiconductors which is made up of a sandwich-liked structure that consists of a semiconductor formed between a photo-sensitized anode and an electrolyte. In this research, we focused on the TiO 2 photoelectrode by evaluating the particle size of titania, determining the effects of molecular binder PEG towards TiO 2 paste preparation, as well as the effects of natural dye by comparing the blueberry, gardenia blue and yellow and red yeast dye, and evaluating the effect of the multilayer of TiO 2 .

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Low-Temperature Synthesis of Nanometer-Sized Crystalline TiO2 Particles and Their Photoinduced Decomposition of Formic Acid

Cited by 89 publications

References 17 publications

A comparison between bulk and supported TiO2 photocatalysts in the degradation of formic acid

A comparison between bulk and supported TiO2 photocatalysts in the degradation of formic acid

Controlled Nanophase Development in Photocatalytic Titania

The Basic Research on the Dye-Sensitized Solar Cells (DSSC)

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