Study of ozone oxidation of dimethyl sulfide and surface analysis of iodine catalysts

This study, reports on ozone catalytic oxidation of dimethyl sulfide; a major odor material of waste water facilities. Xenon excimer lamp (XEL) was used for ozone generation, and iodine (I^- and IO₃^-) were utilized as a catalyst. Activated carbon impregnated with iodine and sulfate, activated carbon impregnated with iodine and activated carbon without impregnation were tested as catalysts. Only activated carbon impregnated with iodine and sulfate had catalytic activity in the dynamic adsorption experiment. Breakthrough time of dimethyl sulfide was increased by 10 times by adding ozone in activated carbon impregnated with iodine and sulfate. Catalyst characterization by pH measurement and XPS analysis suggested that catalytic activity of iodine was influenced by the surface acidity. These results suggest that the XEL and activated carbon impregnated with iodine and sulfate are applicable in ozone catalytic oxidation in gas treatments.