Ozone catalytic oxidation of dimethyl sulfide and surface analysis of iodine catalyst

Abstract

This study reports on the ozone catalytic oxidation of dimethyl sulfide; a major odor material in wastewater facilities. A xenon excimer lamp (XEL) was used for ozone generation, and iodine compounds (I− and IO3 −) were utilized as a catalyst. The three types of activated carbon tested as catalysts were: activated carbon impregnated with iodine compounds and sulfate (AC-I/S), activated carbon impregnated with iodine (AC-I) and activated carbon without impregnation (AC). Only AC-I/S had catalytic activity in the dynamic adsorption experiment. The breakthrough time of dimethyl sulfide increased by 10 times upon adding ozone to the AC-I/S. Catalyst characterization by pH measurement and XPS analysis suggested that the catalytic activity of iodine compounds was influenced by the surface acidity. These results suggest that the XEL and AC-I/S are applicable for ozone catalytic oxidation in gas treatments.