Abstract:

A new kind of catalyst ,Fe³⁺ / γ-A l₂O₃ , was prepared by means of ultrasonic radiation and impregnation,and the heterogeneous catalytic oxidation of phenol-containing wastewater w as conducted with Fenton reagent.Then, the catalytic activities of the catalysts obtained by the two above-mentioned methods were compared and characterized by means of XRD and XPS. The results show that the Fe³⁺ / γ-A l₂O₃ catalyst obtained by ultrasonic radiation is of strong catalytic activity, and the correspond ing degradation rate and conversion efficiency are two times those of the catalyst obtained by impregnation. XRD results show that the catalytic activity of the catalyst is related to the dispersion state of Fe³⁺ onγ-A l₂O₃ surface. XPS results show that the catalyst obtained by ultrasonic radiation is of a lower dispersed diffraction peak of Fe₃O₄ and a wider half-peak width, which means that Fe₃O₄ well disperses on the catalyst surface with small particle size, or exists in non-crystallized amorphous state, thus improving the catalytic activity

Key words: ultrasonic radiation, heterogeneous reaction, Fe³⁺ / γ-A l₂O₃catalyst, preparation, phenol, degradation, Fenton reagent