Preparation of H_3PMo_(12)O_(40)/organobentonite by chemical immobilization method and its catalytic performance in photo-Fenton process

摘要

Homogeneous photo-Fenton process has some significant disadvantages in wastewater treatment. Heterogeneous photo-Fenton process overcomes the disadvantages of homogeneous photo-Fenton process, and shows good prospects in engineering application. In this study, H_3PMo_(12)O_(40)/organobentonite was prepared by a chemical immobilization method, and catalytic performance of H_3PMo_(12)O_(40)/organobentonite as heterogeneous catalyst in photo-Fenton process was evaluated by adopting methyl orange (MO) dye as a model pollutant. The removal ratio of MO was impacted by reaction time, H_2O_2 concentration, and initial MO concentration. H_3PMo_(12)O_(40)/organobentonite had a wide applicable range of pH and temperature for waste-water treatment. H_3PMo_(12)O_(40)/organobentonite had a long-term stability, and retained almost all of its catalytic stability and activity for four recycling times. Characterization results of H_3PMo_(12)O_(40)/organobentonite showed that H_3PMo_(12)O_(40) was successfully immobilized on the organobentonite by the chemical immobilization method. The possible mechanisms involving in both catalyst preparation and photo-Fenton process were presented in this paper. H_3PMo_(12)O_(40)/organobentonite was successfully prepared by the chemical immobilization method through grafting. H_3PMo_(12)O_(40)/organobentonite as heterogeneous catalyst had certain advantages for practical use in photo-Fenton process.