Photopromoted TiO2-Catalyzed Oxidative Decomposition of Organic Pollutants in Water and in the Vapor Phase

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Abstract
Data are presented on the photopromoted TiO2-catalyzed oxidative decomposition in liquid water of sixteen organic pollutants of widely different chemical types: Arochlor 1254, Arochlor 1260, benzene, chlorobenzene, chloroform, 2-chlorophenol, N,N-dimethylformamide (DMF), EDTA, ethylene glycol monomethyl ether, Freon 113 (C2Cl3F3), glycerol, methanol, 2-nitrotoluene, phenol, toluene and trichloroethylene (TCE). Promotion of photocatalytic oxidation by H2O2 is an important feature of many, if not all, of these reactions. All components of a mixture of six pollutants underwent oxidative decomposition but relative rates in the mixture were not the same as for the separately-reacted components. Data are also presented on the photopromoted TiO2-catalyzed oxidative decomposition of nine vaporized organic pollutants: acetone, benzene, chloroform, DMF, Freon 113, 2,2,4-trimethylpentane, methylchloroform, TCE and toluene. An important result is the observation of linear increase of photoefficiency with concentration of TCE up to an efficiency of 22 molecules of TCE mineralized per photon incident on 2.2 mM TCE vapor.

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