Journal ArticleDOI
Kinetics of photocatalytic reactions under extremely low-intensity uv illumination on titanium dioxide thin films
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In this article, the photocatalytic decomposition efficiency of gaseous 2-propanol was studied using a titanium dioxide thin film under very weak UV light; the incident UV light intensity was 36 nW−45 μW·cm-2.Abstract:
The photocatalytic decomposition efficiency of gaseous 2-propanol was studied using a titanium dioxide thin film under very weak UV light; the incident UV light intensity was 36 nW−45 μW·cm-2. Under such low-intensity UV illumination, the value of the quantum yield (QY) increased gradually with decreasing number of absorbed photons and finally saturated (28%) for a number of absorbed photons less than 4 × 1011 quanta·cm-2·s-1 for an initial 2-propanol concentration of 1000 ppmv. Thus, purely light-limited conditions were reached. For lower initial concentrations, the QY values decreased, but the same maximum QY value as that for 1000 ppmv was also approached with decreasing light intensity. We discuss these results in terms of the normalized absorbed photon number (Inorm/s-1), a parameter that we have defined as the ratio of the number of absorbed photons ([photon]ab) to the number of adsorbed 2-propanol molecules ([M]ad). When all of the experimental QY values were plotted as a function of Inorm, all of ...read more
Citations
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Journal ArticleDOI
Titanium dioxide photocatalysis
TL;DR: A review of the current progress in the area of TiO 2 photocatalysis, mainly photocatalytic air purification, sterilization and cancer therapy is discussed in this paper.
Titanium dioxide as photocatalysis
A Fujshima,T N Rao,D K Tryk +2 more
TL;DR: A review of the current progress in the area of TiO 2 photocatalysis, mainly photocatalytic air purification, sterilization and cancer therapy is discussed in this article.
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TiO2 photocatalysis and related surface phenomena
TL;DR: The field of photocatalysis can be traced back more than 80 years to early observations of the chalking of titania-based paints and to studies of the darkening of metal oxides in contact with organic compounds in sunlight as discussed by the authors.
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Photocatalytic reduction of CO2 on TiO2 and other semiconductors.
Severin N. Habisreutinger,Severin N. Habisreutinger,Severin N. Habisreutinger,Lukas Schmidt-Mende,Lukas Schmidt-Mende,Jacek K. Stolarczyk +5 more
TL;DR: In this paper, the authors present a review of the current approaches for the heterogeneous photocatalytic reduction of CO2 on TiO2 and other metal oxide, oxynitride, sulfide, and phosphide semiconductors.
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Titanium dioxide photocatalysis: present situation and future approaches
Akira Fujishima,Xintong Zhang +1 more
TL;DR: Fujishima et al. as mentioned in this paper summarized the present commercialization of TiO2-based products and highlighted several points for the future development of the material for photocatalysis.
References
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Electrochemical Photolysis of Water at a Semiconductor Electrode
Akira Fujishima,Kenichi Honda +1 more
TL;DR: Water photolysis is investigated by exploiting the fact that water is transparent to visible light and cannot be decomposed directly, but only by radiation with wavelengths shorter than 190 nm.
Journal ArticleDOI
Heterogeneous photocatalytic oxidation of gas-phase organics for air purification: Acetone, 1-butanol, butyraldehyde, formaldehyde, and m-xylene oxidation
José Peral,David F. Ollis +1 more
TL;DR: In this article, photocatalyzed degradations of trace levels of various oxygenates and an aromatic in air were carried out using near-UV-illuminated titanium dioxide (anatase) powder.
Journal ArticleDOI
Subnanosecond Relaxation Dynamics in TiO2 Colloidal Sols (Particle Sizes Rp = 1.0-13.4 nm). Relevance to Heterogeneous Photocatalysis
Journal ArticleDOI
An efficient TiO2 thin-film photocatalyst: photocatalytic properties in gas-phase acetaldehyde degradation
TL;DR: In this paper, a semitransparent TiO2 film with extraordinarily high photocatalytic activity was prepared on a glass substrate by sintering aTiO2 sol at 450 °C.
Journal ArticleDOI
Determination of the Quantum Yield for the Photochemical Generation of Hydroxyl Radicals in TiO2 Suspensions
Lizhong Sun† and,James R. Bolton +1 more
TL;DR: In this paper, a method for the determination of the quantum yield of hydroxyl radical production in heterogeneous systems has been developed, based on measurements of •OH radical generation rates and the photon flux absorbed by TiO2 suspensions.
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