Photocatalyzed titanium dioxide

Soana, F., Sturini, M., Cermenati, L., and Albini, A. (2000) Titanium dioxide photocatalyzed oxygenation of naphthalene and some of its derivatives. Journal of the Chemical Society, Perkin Transactions 2, 2 (4), 699—704. 

Photolytic. Complete mineralization was reported when distilled deionized water containing chloroform (118 ppm) and 0.1 wt % titanium dioxide as a catalyst was irradiated with UV light. Mineralization products included carbon dioxide and HCl (Pruden and Ollis, 1983). Photocatalyzed mineralization of chloroform in the presence of titanium dioxide as catalyst... 

Titanium Dioxide-Photocatalyzed Reactions of Organophosphorus Compounds in Aqueous Media... 

Titanium dioxide photocatalyzed oxidation of neat tetralin was previously reported to give its hydroperoxide (14). Reinvestigation showed that tetralol and tetralone are also formed in acetonitrile possibly through electron transfer from tetralin to the positive holes (27). 

Titanium dioxide is widely used in the production of plastics, enamels, artificial fibers, electronic materials, and rubber (Hadjiivanov and Klissur-ski, 1996). Its ability to photocatalyze the oxidation of organic materials has been known for years in the paint industry. For this reason, TiOz is used as a white paint pigment (Stafford et al., 1996). TiOz is also known as an excellent catalyst for semiconductor photocatalysis due to its nonselectivity for environmental engineering applications it is nontoxic, insoluble,... 

Muszkat L, Feigelson L, Bir L, Muszkat KA. Titanium dioxide photocatalyzed oxidation of proteins in biocontaminated waters. J Photochem Photobiol B Biol 2001 60 32-6. 

Goutailler G, Valette )-C, Guillard C, Paisse O, Faure R (2001) Photocatalyzed Degradation of Cyromazine in Aqueous Titanium Dioxide Suspensions Comparison with Photolysis, /. Photochem. Photobiol. A Chem. 141 79-84. 

O Shea KE. Titanium dioxide-photocatalyzed reactions of organophosphorus compounds in aqueous media. Mol Supramol Photochem 2003 10(Semiconductor Photochemistry and Photophysics) 231-247. 

Valladares, J., and Bolton, J., 1993, A method for the determination of quantum yields in heterogeneous systems The titanium dioxide photocatalyzed bleaching of methylene blue. Trace Metals in. the Environment 3 111-120. 

Martin, G. P., Robinson, A. J., and Worsley, D.A. (2006) Hydrotalcite mineral stabilization of titanium dioxide photocatalyzed degradation of un-plasticized polyvinyl chloride,... 

The influence of photocatalyst particle size on gas solid photocatalyzed rate has recently been examined [107,108], using titanium dioxide powder entrained in a flowing gas transport reactor. Consideration of the complex number form of the particle extinction coefficient leads to calculated extinction and absorption efficiencies versus particles size that have maxima at 0.09 fim and become "constant above 10 /xm. Since particle extinction rises for particles smaller than 10 /xm, the calculated reactant conversion shows a maximum at about 10 /xm, falling to the left due to scattering and the right due to diminished photocatalyst surface area. 

Photocatalysis by semiconductor powders, most usually titanium dioxide, has been applied to the oxidation of several aromatics. In many such photocatalytic reactions, the key intermediates are hydroxyl radicals formed by oxidation of water. With rather good donors such as aromatic compounds, hole transfer on the excited semiconductor surface is a viable alternative in this case, the reaction of the radical cation of the substrate or further intermediates arising from it with oxygen or superoxide anion may have a role. Photocatalyzed oxidation of naphthalene yields 2-formyldrmamaldehyde and 1,4-naphthoquinone as the primary products (Eq. (45.16)), similarly to what occurs upon direct irradiation of naphthalene in water ... 

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