The removal of dimethyl phthalate (DMP), which is a pollutant of concern in water environments, was carried out by catalytic ozonation with TiO2/Al2O3 catalysts. The heterogeneous catalytic ozonation was an ozonation process combined with the catalytic and adsorptive properties of the TiO2/Al2O3 catalysts to significantly accelerate the mineralization efficiency. Semi-batch ozonation was performed under various experimental conditions including the fed ozone concentration, catalyst type, catalyst dosage, and ultraviolet radiation on the degradation of DMP. The complete removal of DMP was efficiently achieved by both sole and catalytic zonation; meanwhile, the presence of the catalysts slightly accelerated the elimination rate of DMP. On the other hand, the mineralization efficiency, in terms of total organic carbon (TOC) removal, was substantially enhanced by employing the TiO2/Al2O3 catalyst. The mineralization efficiency using the TiO2/Al2O3 catalyst was the highest, followed in decreasing order by the Al2O3 catalyst, the TiO2 catalyst, and sole ozonation. In addition, the use of the TiO2/Al2O3 catalyst would increase the utilization efficiency of the fed ozone, especially in the late ozonation period. Furthermore, the decrease in the catalytic activity of the TiO2/Al2O3 catalyst after multi-run experiments can be mostly recovered by an incineration process at a high temperature. (C) 2011 Elsevier B.V. All rights reserved.