The Study On The Preparation And The Catalytic Property Of Two Nano Metal Oxide

CuO and Mn₃O₄ are two very important application value transition metal oxide nanomaterials.They has been widely used in many fields.In this study,CuO and Mn₃O₄ nanoparticles were successfully prepared at a room temperature by ultrasound-assisted aqueous milling process using Cu?CH₃COO?₂,Mn?CH₃COO?₂,MnO,Mn as raw materials.XRD,SEM,TEM were carried out to confirm the microstructure of CuO and Mn₃O₄.Catalytic property of CuO and Mn₃O₄ was characterized by UV spectrophotometer?UV?analyzer.For verifing the coupling effect of ultrasound radiation and mechanical ball milling on the synthesis of products.Ultrasound-assisted aqueous milling,ball milling and ultrasound radiation experiments were carried out to compare,and reaction solution were characterized by XRD,UV,fluorescence intensity and conductivity.We also have discussed the influence of different reaction raw material on product performance.In addition,catalytic properties of CuO and Mn₃O₄ nanoparticles and different experimental parameters on the catalytic performance were studied.?1?CuO and Mn₃O₄ nanoparticles were successfully prepared by ultrasound assisted aqueous ball milling.The average particle sizes of the two transition metal oxide were 20nm,30nm,respectively.?2?The experimental results show that only ultrasound-assisted aqueous ball milling method can synthesis CuO and Mn₃O₄ nanoparticles with complete lattice when acetates as reaction raw materials,while other two methods were difficult to form oxides,revealing the coupling effects of microwave radiation and mechanical milling force on the preparation of the oxide.?3?The concentration change of ·OH and ions in aqueous solution were researched.The fluorescence intensity of ultrasound-assisted aqueous ball milling was obviously higher than only ball milling and ultrasound radiation,and the concentration of ·OH tended to be stable at the end of only process of ball milling and ultrasound radiation.The electroconductivity of ultrasound-assisted aqueous ball milling was higher than that of only ball milling and ultrasound radiation.So,it can prove that the coupling effect of ultrasound and ball milling can reduce the activationenergy of the reaction,and speed up the reaction rate and promote the formation of the products.?4?The experimental results of catalytic degradation of methylene blue and rhodamine B by CuO and Mn₃O₄ nanoparticles indicated that the two transition metal oxide nanoparticles exhibit good catalytic performance.Degradation of methylene blue aqueous solution of 10mg CuO reached up to 99.8%in the presence of H₂O₂ within 25 min at 65?.Degradation of methylene blue and rhodamine B aqueous solution of 10mg Mn₃O₄ reached up to 99.6%and 98%in the presence of H₂O₂ within 40 min and 50min at 65?,respectively.?5?In catalytic performance test,by changing the parameters,such as reaction temperature,dosage of catalyst,H₂O₂ content rate to discuss the degradation rate of methylene blue and rhodamine B.The experimental results showed that increasing reaction temperature and the amount of H₂O₂,the degradation rate also rised.Within a certain range,increase the dosage of catalyst,can improve the degradation rate.