Preparation And Catalytic Properties Of The Magnetic Manganic Manganous Oxide Fine Particles

There have been lots of reports about preparing the Manganic manganous oxide(Mn3O4) of different structures, but most of them have the defects of high production cost,complicated preparation conditions and no large scale production. Along with the time change and social development,lots of energy and environment problems become more severely; aiming to solve these problems,our team intend to try our best to explore the more environmental method to the synthesis of Mn3O4. The specific content as follows:Taking Mn SO4 and HMT as the manganese source and weak base precipitants and adding different surface active agents, the influence of different types of surface active agents and different additive amount of surface active agents on the shapes and sizes of the products is researched by preparing the Mn3O4 with hydrolysis and oxidation method. The result shows that the generated Mn3O4 fine particleshas the best shape when the surface active agent is SDBS and the additive amount is 0.5g. The XRD test shows that the crystal form is excellent and the degree of crystallinity is high when the product is tetragonal system; the FI-IR test shows that the Mn-O in the spectrum has obvious vibration absorption, demonstrating that the product is Mn3O4 also the SEM test shows that the products are averagely square particles and the particle size after calcination is 90~150nm; the BET test shows that the product still has definite specific surface area through high-temperature calcinations and the material is mesoporous material by means of pore analysis; the VSM test shows that the saturation magnetization of Mn3O4 is 1.77emu/g.Taking three organics: methylene blue,phenol and rhodamine B as the degradation agents, the catalytic performance of the product is researched. After the contrast research,XRD and FI-IR test,we know Mn3O4 can act as catalyst in reaction.The result also shows that the methylene blue can be completely decolored within 40 min when the additive amount of the Mn3O4 is 0.2g/L, the decolourization ratio of the rhodamine B highly reach 97%, the degradation rate of phenol is slower and need 90 min, the degradation rate can also reach 86%. It shows that the Mn3O4 has strong catalytic action on the degradation of the organics that contain double bond and benzenering.