Abstract
Anionic DBS and cationic BDDAC surfactants were decomposed photocatalytically in air-equilibrated aqueous TiO{sub 2} dispersion under Hg-lamp irradiation. The cleavage of the aromatic moiety, the intermediacy of peroxides and aldehydes, and the ultimate mineralization to CO{sub 2} were examined for DBS and compared to those of BDDAC. The anionic DBS photodegrades faster than the cationic BDDAC. The aromatic moiety in the surfactant structure is decomposed more rapidly than the alkyl chain. Evidence for the formation of reactive {sup {lg_bullet}}OH radicals was obtained using spin-trapping (DMPO) ESR spectroscopy. The photodegradation kinetics are discussed in terms of Langmuir-Hinshelwood model. A photodegradation mechanism is proposed on the basis of the experimental results. 15 refs., 5 figs., 2 tabs.
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