The Study On Preparation And Performance Of Metal Oxide Catalyst Based On Activating Peroxymonosulfate

Now,the advanced oxidation processes based on sulfate radicals?SR-AOPS?plays an important role in organic wastewater degradation.The key technology is the method of activating peroxymonosulfate?PMS?.In this study,we prepared the metallic oxide catalyst?different morphology MnO₂?Fe₃O₄/MnO₂ composite oxide?activating PMS,we studied the performances of activating peroxymonosulfate about ultrasound-assisted MnO₂?different morphology MnO₂ and Fe₃O₄/MnO₂ composite oxide.Rh B degradation with advanced oxidation process by MnO₂ activating peroxymonosulfate?PMS?with ultrasound irradiation.This study focus on the effect of parameters on Rh B degradation,such as the concentration of PMS,the concentration of MnO₂,the ultrasound power,the initial pH and concentration of Rh B solution,the temperature.The optimized conditions are 0.5 g/L PMS,0.8 g/L MnO₂.The optimized ultrasound power is 80 W.In addition,this method can be applied in a wide range of temperature from 25 to 65?and pH from 3 to 9.The catalyst was recycled for 3 times,Rh B degradation rate have a slight change.In this study,we synthesized three MnO₂,including two different morphology features of 1Dmanganese dioxide,nanorods and nanowires,and without morphology of?-MnO₂.The nanowires MnO₂ have the best catalytic activity,according to Rh B degradation on nanowires MnO₂ activating peroxymonosulfate,the best conditions of Rh B degradation in aqueous solutions are 10 mg/L Rh B,0.5 g/L PMS,0.3 g/L nanowires MnO₂,35?and pH=8.The eliminating radicals experiments indicated that SO₄^-·plays an important role in degrading organic compounds in aqueous solution.The activation of PMS?the generation of SO₄^-·and the process of Rh B degradation are analyzed.The Fe₃O₄/MnO₂ magnetic Fe-Mn bimetal oxide catalyst prepared via hydrothermal method shows a better performance in activating PMS for Rh B degradation in aqueous solutions.The characterization of XRD?SEM and TEM show that two metallic oxide are loaded together.Three Fe₃O₄/MnO₂ magnetic Fe-Mn bimetal oxide catalysts all have good performance in activating PMS,the 2:3Fe₃O₄/MnO₂ catalyst has the best catalytic activity,the best conditions about 2:3Fe₃O₄/MnO₂ catalyst activating PMS are 10 mg/L Rh B,0.4 g/L Fe₃O₄/MnO₂,0.3 g/L PMS,45?and pH=8.After three cyclic utilizations,the 2:3 Fe₃O₄/MnO₂ magnetic Fe-Mn bimetal oxide catalyst still has a good performance.The eliminating radicals experiments indicated that SO₄^-·plays an important role in degrading Rh B in aqueous solutions.