Photosensitive Metal—Organic Systems

Kutal, Charles

doi:10.1021/ba-1993-0238.ch001

Cited by 8 publications

(3 citation statements)

References 34 publications

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“…TiO 2 offers great potential as a material for use in the industrial technology of detoxifying wastewater [11]: since the process occurs under ambient conditions, the formation of photocyclized intermediate products, unlike in direct photolysis techniques, is avoided, the photocatalyst is inexpensive and has a high turnover.…”

Section: Introductionmentioning

confidence: 99%

Photocatalytic, spectroscopic and transport properties of lanthanide-doped TiO₂nanocrystals

Bettinelli

Speghini

Falcomer

et al. 2006

J. Phys.: Condens. Matter

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The photocatalytic properties of the anatase form of nanocrystalline TiO 2 doped with lanthanide ions (Eu 3+ , Sm 3+ and Er 3+ ), obtained by a sol-gel preparation method, are studied by means of the degradation of methylene blue. It is observed that the presence of Sm 3+ ion as a dopant significantly improves the photocatalytic activity of anatase TiO 2 with respect to the Eu 3+ or Er 3+ ions.For the understanding of such a catalytic process the charge transport in these systems is studied by an appropriate Monte Carlo simulation which includes phonons, charged impurities and traps. The obtained results evidence the important role of the traps for the transit of the electrons in the systems investigated here. They decrease the diffusion coefficient by about three orders of magnitude with respect to the bulk, from which it is possible to obtain a simple estimate of the reaction rate in agreement with experimental results. All the lanthanide-doped samples show a strong luminescence in the visible region. The emission bands are affected by a notable inhomogeneous broadening, indicating a high disorder of the crystalline environment of the lanthanide ions in the titania host.

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Section: Introductionmentioning

confidence: 99%

Photocatalytic, spectroscopic and transport properties of lanthanide-doped TiO₂nanocrystals

Bettinelli

Speghini

Falcomer

et al. 2006

J. Phys.: Condens. Matter

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“…2,9 Homogeneous transition-metal photocatalysis can divided into two major categories: (1) photogenerated catalysis and (2) catalyzed photolysis. 12 The first transformation called photogenerated catalysis occurs in systems in which an active ground-state catalyst (C) is generated from M (transition-metal catalyst or catalyst precursor) or from an M and O (in which O is a reactant). This process, shown in the following scheme ( Figure 2), is followed by the catalysis of organic substrate or the reactant molecule to the product by activated C that is regenerated in each catalytic cycle.…”

Section: Homogeneous Photocatalysismentioning

confidence: 99%

“…This process, shown in the following scheme ( Figure 2), is followed by the catalysis of organic substrate or the reactant molecule to the product by activated C that is regenerated in each catalytic cycle. 12 Another process, called photoinitiation, begins with the production of a light-induced initiator (I) from an M or both M and O. Unlike the first case in which the catalyst C is continuously regenerated, the initiator is consumed in this case while initiating the chain reaction shown by the following scheme:…”

Section: Homogeneous Photocatalysismentioning

confidence: 99%

Photo- and Electro-Catalysis

Laursen

Poudyal

2015

Novel Materials for Carbon Dioxide Mitigation Technology

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Photocatalysis

Serpone¹

2000

Kirk-Othmer Encyclopedia of Chemical Technology

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When photons are implicated in a catalytic reaction, the system becomes a photocatalytic one. The catalyst may accelerate the photoreaction by interaction either with a substrate in its ground or an excited state, and/or with the primary photoproduct. Although not yet commercially viable, photocatalytic processes may provide an alternative to the traditional routes to water purification, destroying bacterial substances, and dissolved organics in waste streams. The process can be homogeneous, employing an oxidant and ultraviolet light, or heterogeneous, utilizing air, semiconductor particles (the photocatalyst), and ultraviolet radiation. These various pathways are discussed. The mechanistic details of using semiconductor particles as light harvesters is reviewed, as are the mechanisms by which the photooxidation occurs. Examples of aqueous dissolved organic compounds photooxidized to carbon dioxide and water in the presence of titanium dioxide, air, and near‐ultraviolet radiation are given.

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Photosensitive Metal—Organic Systems

Cited by 8 publications

References 34 publications

Photocatalytic, spectroscopic and transport properties of lanthanide-doped TiO₂nanocrystals

Photocatalytic, spectroscopic and transport properties of lanthanide-doped TiO₂nanocrystals

Photo- and Electro-Catalysis

Photocatalysis

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Photosensitive Metal—Organic Systems

Cited by 8 publications

References 34 publications

Photocatalytic, spectroscopic and transport properties of lanthanide-doped TiO2nanocrystals

Photocatalytic, spectroscopic and transport properties of lanthanide-doped TiO2nanocrystals

Photo- and Electro-Catalysis

Photocatalysis

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Photocatalytic, spectroscopic and transport properties of lanthanide-doped TiO₂nanocrystals

Photocatalytic, spectroscopic and transport properties of lanthanide-doped TiO₂nanocrystals