Characteristics of MnO2 catalytic ozonation of sulfosalicylic acid and propionic acid in water

The characteristics of different types of MnO2 Catalytic ozonation of sulfosalicylic acid (SSal) and propionic acid (PPA) have been investigated in this paper. The experimental results show the dependence of catalytic activity of MnO2 on organic compounds and the pH of solutions, but it is independent on the type of MnO2. For example, three types of MnO2 have not any catalytic activity when ozonation of PPA under the condition of this experiment. All MnO2 catalytic ozonation of SSal at pH = 1.0 have a greater total organic carbon removal than ozonation alone has, however, at pH = 6.8 and 8.5, catalytic efficiency is not observed. Furthermore, the batch experimental results indicate that there are no direct relationship between the activity of metal oxide catalytic decomposition of ozone and that of its catalytic degradation of organic compounds. (C) 2003 Elsevier Science Ltd. All rights reserved.