Morphology of thin anatase coatings prepared from alkoxide solutions containing organic polymer, affecting the photocatalytic decomposition of aqueous acetic acid

Kato, Kazumi; Tsuzuki, A.; Torii, Yasuyoshi; Taoda, Hiroshi; Kato, Tsuyoshi; Butsugan, Yasuo

doi:10.1007/bf00356349

Cited by 146 publications

(62 citation statements)

References 8 publications

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“…For mineralization of AcOH, the number is presumed to be one; one-electron (hole) oxidation of AcOH adsorbed on the TiO 2 surface can be a significant process to determine the overall rate, because a proposed intermediate radical undergoes feasible addition of O 2 followed by thermal degradation. 67 In this reaction system, eand h + do not need to migrate in the TiO 2 particle before completing the reaction, that is, the adsorbability becomes a more significant factor determining the photocatalytic activity than does the recombination property. The dehydrogenation of 2-PrOH is formally a two-electron process.…”

Section: Resultsmentioning

confidence: 99%

Correlation between Some Physical Properties of Titanium Dioxide Particles and Their Photocatalytic Activity for Some Probe Reactions in Aqueous Systems

et al. 2002

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Nanocrystalline anatase titanium(IV) oxide (TiO 2 ) particles were synthesized by hydrothermal crystallization in organic media (HyCOM) followed by calcination at various temperatures up to 1273 K, and they were characterized by analysis of surface adsorption of the substrates, as well as by X-ray diffraction (XRD) and Brunauer-Emmet-Teller (BET) surface area measurements. These HyCOM TiO 2 samples were used for three kinds of photocatalytic reactions: mineralization of acetic acid (AcOH) in aerated aqueous suspensions, dehydrogenation of 2-propanol (2-PrOH) by in situ platinized powders, and silver-metal deposition from silver ions (Ag + ) in deaerated aqueous suspensions of bare TiO 2 samples. Dependence of the photocatalytic activities on calcination temperature (T c ) and on the amount of adsorbed substrates in each reaction and correlations with the physical properties of HyCOM TiO 2 were examined. In the case of mineralization of AcOH, the activitiy of each sample was almost proportional to the amount of surface-adsorbed AcOH in the dark, and the uncalcined (as-prepared) HyCOM TiO 2 showed the highest activity, which was monotonically reduced with T c , that is, with decrease in the amount of surface-adsorbed AcOH. On the other hand, in the case of silver-metal deposition, the photocatalytic activity was enhanced by calcination at higher temperature, despite the simultaneous decrease in the amount of surface-adsorbed Ag + in the dark. Overall, the effects of calcination on the photocatalytic activities for several reaction systems strongly suggested that photocatalytic activity depends on two significant factors, adsorbability and recombination probability, corresponding to the specific surface area and crystallinity, respectively, and that the balance of these two factors determines the T c dependence.

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Section: Resultsmentioning

confidence: 99%

Correlation between Some Physical Properties of Titanium Dioxide Particles and Their Photocatalytic Activity for Some Probe Reactions in Aqueous Systems

et al. 2002

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“…In addition, the polymer chains in tungstate suspension act as steric stabilizer that prevents aggregation of particles. Currently, polyethylene glycol (PEG, in a variety of molecular weights) is considered as an effective steric stabilizer and template during the synthesis of TiO 2 photocatalysts with high surface area values [13][14][15]. PEG is a water soluble organic polymer with a structure of HO-(CH 2 -O-CH 2 ) n -OH, where n represents the average number of oxyethylene groups.…”

Section: Introductionmentioning

confidence: 99%

Precipitation synthesis of WO3 for NO removal using PEG as template

Luévano-Hipólito¹,

Cruz²,

Yu³

et al. 2014

Ceramics International

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“…Once one hole reacts with acetic acid adsorbed on TiO 2 surface, successive oxidation by O 2 dissolved in the liquid phase proceeds thermally [16], indicating that decomposition of acetic acid is relatively simple. On the other hand, decomposition of organic compounds consisting of large molecules such as dye seems to be difficult and complicated, and the property required for effective degradation of acetic acid, i.e., a high level of adsorptivity, might have no effect for decomposition of organic compounds consisting of large molecules.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic decolorization and mineralization of malachite green in an aqueous suspension of titanium(IV) oxide nano-particles under aerated conditions: correlation between some physical properties and their photocatalytic activity

Kominami

Kumamoto

Kera

et al. 2003

Journal of Photochemistry and Photobiology A: Chemistry

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Morphology of thin anatase coatings prepared from alkoxide solutions containing organic polymer, affecting the photocatalytic decomposition of aqueous acetic acid

Cited by 146 publications

References 8 publications

Correlation between Some Physical Properties of Titanium Dioxide Particles and Their Photocatalytic Activity for Some Probe Reactions in Aqueous Systems

Correlation between Some Physical Properties of Titanium Dioxide Particles and Their Photocatalytic Activity for Some Probe Reactions in Aqueous Systems

Precipitation synthesis of WO3 for NO removal using PEG as template

Photocatalytic decolorization and mineralization of malachite green in an aqueous suspension of titanium(IV) oxide nano-particles under aerated conditions: correlation between some physical properties and their photocatalytic activity

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