Photocatalytic oxidation of the sulfur-containing compounds, trimethylene sulfide (C 3 H 6 S), propylene sulfide (C 3 H 6 S), thiophene (C 4 H 4 S), and methyl disulfide (C 2 H 6 S 2 ), was carried out using an annular plug flow reactor with TiO 2 in a supported form. Formation of products and byproducts was monitored in real time using a mass spectrometry online system. Mineralization of the sulfur-containing compounds was confirmed by mass balance of CO 2 and SO 4 2- . Dilute contaminated atmospheres of trimethylene sulfide and propylene sulfide were completely mineralized. For thiophene and methyl disulfide, however, partial oxidation was observed, generating sulfur dioxide (SO 2 ) and sulfur oxide (SO) as byproducts, which were confirmed by parent ion MS/MS spectra as well as by chemical ionization. Sensory analysis showed that for trimethylene sulfide and propylene sulfide, odor intensity after TiO 2 /UV treatment was below the olfactive threshold limit of the panel.
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Canela et al. (1999) studied this question.