Abstract
Photocatalytic oxidation of the sulfur-containing compounds, trimethylene sulfide (C3H6S), propylene sulfide (C3H6S), thiophene (C4H4S), and methyl disulfide (C2H6S2), was carried out using an annular plug flow reactor with TiO2 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 CO2 and SO42-. 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 (SO2) 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 TiO2/UV treatment was below the olfactive threshold limit of the panel.
Published Version
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