Degradation of trace nitrobenzene in aqueous solution by ozone with catalysis of nanosized TiO₂ supported on haydite

This paper presented the results of catalytic degradation of nitrobenzene by ozone in the presence of nanosized TiO₂ supported on haydite, and evaluated influencing factors and the pathway of degradation. Catalysts were prepared by sol-sel method, and sintered in electrical resistance furnace. The optimum sinter temperature was found for preparing the catalyst. The SEM was also used to characterize the catalyst. When the catalyst was sintered at 700°C, it had the best property of catalysis. The catalytic ozonation of nitrobenzene was first order reaction with respect to the concentration of nitrobenzene, and OH · was the dominating species in the oxidation process. As the dose of catalyst increased, the removing rate of nitrobenzene also increased. The highest ozonation rate of this compound, which is 46.5%, was found when pH value was approximately 10. Besides, the catalyst showed good ability after 3 times repeated uses.