Degradation of sodium 4-dodecylbenzenesulphonate photoinduced by Fe(III) in aqueous solution.
The Fe(III)-photoinduced degradation of 4-dodecylbenzenesulphonate (DBS) in aqueous solution was investigated. The mixing of DBS (1 mm) and Fe(III) (1 mm) solutions immediately led to the formation of a precipitate that contained DBS and monomeric Fe(OH)2+, the predominant Fe(III) species. Both species were also present in the supernatant. Irradiation of the supernatant solution resulted in a photoredox process that yielded Fe(II) and *OH radicals. The disappearance of DBS was shown to involve only attack by *OH radicals; the quantum yield of DBS disappearance is similar to the quantum yield of *OH radical formation. A wavelength effect was also observed; the rate of DBS disappearance was higher for shorter wavelength irradiation. Five photoproducts, all containing the benzene sulphonate group, were identified. *OH radicals preferentially abstract hydrogen from the carbon in the alpha position of the aromatic ring. The results show that the Fe(III)-photoinduced degradation of DBS could be used as an alternative method for polluted water treatment.
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Laboratoire de Photochimie Moléculaire et Macromoléculaire, Unité Mixte de Recherche CNRS, Université Blaise Pascal, Aubiere, France.
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D001557:Benzenesulfonates / Q000737:chemistry* / Q000528:radiation effects; D005290:Ferric Compounds; D006801:Humans; D010777:Photochemistry; D012996:Solutions; D013472:Sunlight; D013501:Surface-Active Agents / Q000737:chemistry* / Q000528:radiation effects; D014867:Water; D014874:Water Pollutants, Chemical; D018508:Water Purification
D001557:Benzenesulfonates; D005290:Ferric Compounds; D012996:Solutions; D013501:Surface-Active Agents; D014874:Water Pollutants, Chemical; D014867:Water; C001114:dodecylbenzenesulfonic acid