The Studies On Preparation And Property Of Metal-Catalyzed Ozonation Catalysts

The pollution to drinking water, especislly the pollution of minim and hard-degraded organic matter is one of the main problems in water treatment. Now, the water treatment technicses are mainly used to get rid of color, turbidity and sterilization of water. But, they are difficult to get rid of organic contamination of minim in the water. Metal-catalyzed ozonation is a new advanced oxidation technology which was developed in recently years. It's one of effective methods to hard-degraded organic matters in water treatment. But, the study of metal-catalyzed ozonation catalysts is the key and difficulty in metal-catalytic ozonation technics.Soakage is used to make catalyst such as CuO/NiO/Al₂O₃, CuO/FeO/Al₂O₃, CuO/MnO/Al₂O₃ and NiO/MnO/Al₂O₃. The preparation technics and activity of catalysts were studied.The removal rates of UV₂₅₄ and TOC were used to evaluate the activity of catalytic ozonation catalyst. The influences of experiment factors to activity of catalyst were analysed through experiment. The optimum preparation technics of them were gotten. The optimum preparation technics of CuO/NiO/Al₂O₃ is that soaked time is 6 h, the mol proportion between Cu(NO3)2 and Ni(NO3)2 is 2:1, dryed temperature is 50℃for 2 h and the baked temperature is 300℃for 3 h; The optimum preparation technics of CuO/FeO/Al₂O₃ is that soaked time is 6 h, the mol proportion between Cu(NO3)2 and Fe(NO3)3 is 0.75:0.75, dryed temperature is 70℃for 2 h and the baked temperature is 300℃for 3 h; The optimum preparation technics of CuO/MnO/Al₂O₃ is that soaked time is 5 h, the volume proportion between Cu(NO3)2 and Mn(NO3)2 is 60ml:20ml, dryed temperature is 90℃for 2 h and the baked temperature is 200℃for 3 h; The optimum preparation technics of NiO/MnO/Al₂O₃ is that soaked time is 5 h, the volume proportion between Ni(NO3)2 and Mn(NO3)2 is 40ml:40ml, dryed temperature is 90℃for 2 h and the baked temperature is 400℃for 4 h.The characterization to the structure of catalyst was practiced by modern analysis instruments, such as Scanning Electronic Microscopy and Automatic Surface Area and Porosity Analyzer, surface area, total pore volume and average...