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• W2117390147 abstract "Photocatalysts are solids that can promote reactions in the presence of light without being consumed in the overall reaction (Bhatkhande et al., 2001), and they are invariably semiconductors. A good photocatalyst should be photoactive, able to utilize visible and/or near UV light, biologically and chemically inert, photostable, inexpensive and non-toxic. For a semiconductor to be photochemically active as a sensitizer for the aforementioned reaction, the redox potential of the photogenerated valence band hole should be sufficiently positive to generate OH• radicals that can subsequently oxidize the organic pollutant. The redox potential of the photogenerated conductance band electron must be sufficiently negative to be able to reduce the adsorbed O2 to a superoxide. TiO2, ZnO, WO3, CdS, ZnS, SrTiO3, SnO2 and Fe2O3 can be used as photocatalysts. TiO2 is an ideal photocatalyst for several reasons (Bhatkhande et al., 2001; Fujishima et al., 2000, 2006; Mills & Hunte, 1997; Park et al., 1999; Peral et al., 1997; Periyat et al., 2008). It is relatively cheap, highly stable from a chemical point of view and easily available. Moreover, its photogenerated holes are highly oxidizing, and the photogenerated electrons are sufficiently reducing to produce superoxides from dioxygen groups. TiO2 promotes ambient temperature oxidation of most indoor air pollutants and does not need any chemical additives. It has also been widely accepted and exploited as an efficient technology to kill bacteria. Volatile organic compounds (VOCs) are considered to be as some of the most important anthropogenic pollutants generated in urban and industrial areas (Avila et al., 1998). VOCs are widely used in (and produced by) both industrial and domestic activities since they are ubiquitous chemicals that are used as industrial cleaning and degreasing solvents (Wang et al., 2007). VOCs come from many well-known indoor sources, including cooking and tobacco smoke, building materials, furnishings, dry cleaning agents, paints, glues, cosmetics, textiles, plastics, polishes, disinfectants, household insecticides, and combustion sources (Jo et al., 2004; Wang et al., 2007; Witte et al., 2008). Moreover, ethylene (C2H4) is an odorless and colorless gas which exists in nature and is generated by human activities as a petrochemical derivative, from transport engine exhausts, and from thermal power plants (Saltveit, 1999). However, it is produced naturally by plant tissues and biomass fermentation and occurs along the food chain, in packages, in storage chambers, and in large commercial refrigerators (Martinez-Romero et al., 2007). The effect of ethylene on fruit ripening and vegetable senescence is of significant interest for the" @default.
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• W2117390147 date "2012-02-01" @default.
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• W2117390147 title "X-Ray Spectroscopy Tools for the Characterization of Nanoparticles" @default.
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• W2117390147 doi "https://doi.org/10.5772/29088" @default.
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