Preparation and characterization of Fe2O3-TiO2-MnO2/Al2O3 catalysts

The Fe2O3-TiO2-MnO2/Al2O3 oxide catalyst was prepared by the dipping-calcination method using A12O3 as a carrier. SEM, EDX, BET and XRD techniques were performed to characterize the catalyst. The catalytic activity of the prepared catalyst was investigated by catalytic ozonation of the effluent in sewage plant of chemical industry park at room temperature and atmospheric pressure. The results showed that the optimal preparation parameters were as follow: the molar ratio of Ti4+, Mn2+ and Fe3+ in the dipping solution was 2:2:1, calcination time and temperature 4h and 500℃ respectively. Furthermore, the degradation performance obtained for COD in wastewater showed that the catalytic activity of Fe2O3-TiO2-MnO2/Al2O3 catalyst was good when amount of ozone was 50mg·L-1 and filling ratio of catalyst was 50%, it could be removed 52.2% of COD after 60min oxidation. Three-dimensional fluorescence spectra showed that visible humus and UV humus in the wastewater were completely degraded after catalytic ozonation, and a small amount of fulvic was generated. © 2016, Editorial Board of China Environmental Science. All right reserved.