Mesoporous TiO2/carbon catalytic ozonation for degradation of p-chloronitrobenzene

In this study, a mesoporous TiO 2 /carbon catalyst (TiO 2 /C) was prepared by a facile impregnation-carbonization approach to catalyze ozonation of p -chloronitrobenzene ( p -CNB). The catalyst was well characterized and the catalytic efficiency under various conditions was systematically evaluated. TiO 2 /C has a disordered mesostructure with a high specific surface area. 92.8% of p -CNB (2 μmol/L) can be degraded within 20 min in the TiO 2 /C/O 3 system in the presence of 1 mg/L O 3 , 100 mg/L catalyst, at pH = 5. Based on the evaluation of the effect of basic parameters, it could be deduced that the removal of p -CNB relied on the synthetic effect of catalysis by TiO 2 /C and the autocatalytic induction of p -CNB. The removal efficiency of p -CNB, the structure change and the leaching of Ti ions were also evaluated in five cycles, indicating TiO 2 /C is stable and recyclable for catalytic ozonation in water treatment.