Abstract:

Fe₃O₄ catalyst supported on spherical γ-Al₂O₃ was prepared with and without ultrasonic treatment during the impregnation step, and the heterogeneous catalytic oxidation of dimethoate wastewater was conducted with Fenton reagent.Then, the physical and chemical properties of the catalysts were analyzed by means of XRD, ICP-AES and SEM, especially the effect of Fe₃O₄ dispersity on γ-Al₂O₃.The results showed that the activity of the supported catalysts prepared with ultrasonic treatment for dimethoate was higher than those without ultrasonic treatment and the corresponding degradation rate doubled those of the catalyst obtained by impregnation.The probable cause was that for catalysts prepared with ultrasonic treatment, Fe₃O₄ was well dispersed on the catalyst surface with small particle size, or existed in non-crystalline amorphous state, and Fe content on the catalyst surface was higher than those without ultrasonic treatment.

Key words:

超声浸渍, 非均相反应, Fe₃O₄/γ-Al₂O₃负载型催化剂, 降解, Fenton试剂

关键词:

超声浸渍, 非均相反应, Fe₃O₄/γ-Al₂O₃负载型催化剂, 降解, Fenton试剂