Photocatalytic ozonation of dimethyl phthalate over TiO_2 prepared by a hydrothermal method

摘要

TiO_2 catalyst was prepared by two kinds of different methods. The photocatalytic activity of TiO_2 prepared by the hydrothermal method is 2.5 times higher than that by sol-gel in degradation dimethyl phthalate (DMP). The combined photocatalysis with UV irradiation and ozonation (TiO_2/UV/O_3) process considerably improved mineralization and degradation of dibutyl phthalate compared to combined photocatalysis with UV irradiation (TiO_2/UV) process, combined ozonation with UV irradiation (UV/O_3) process and ozonation alone (O_3) process. DMP can be quickly mineralized in TiO_2/UV/O_3, its mineralization process followed Langmuir-Hinshelwood model. Its rate constant k is 0.42 mg/ (L·min) and Langmuir adsorption coefficient K is 0.0417 L/mg.