Preparation And Application Research Of Nano Metal Oxides And Magnetic Films

With the rapid development of science and technology and the arrival of industry 4.0.Environmental problems have always been an important issue accompanying development.How to deal with the contradiction between environment and development is closely related to people’s health,ecological environment stability and sustainable economic development.In order to coordinate the relationship between environment and development,it is of great significance to vigorously promote green recycling industrial economy and achieve zero pollution and zero emission.Based on this paper,the adsorption and catalytic treatment of organic dyes in sewage were studied.The main contents of this paper can be divided into three parts,the synthesis and adsorption properties of Fe₃O₄/C,the preparation and catalytic properties of cluster type CuO and the synthesis and adsorption properties of CoMnNiP magnetic thin films.The details as following:1.Preparation and characterization of Fe₃O₄/C and its adsorption propertiesSolvothermal method was used to prepare Fe₃O₄/C nano-magnetic particles.The reaction conditions were controlled in the reaction process.The Teflon-lined stainless autoclave was heated at 100℃for 24 h and then heated to 180℃for another 24 h.After that the sample were washed and dried.The as-prepared samples were analyzed by X-ray diffraction（XRD）,The Energy Dispersive Spectrometer（EDS）,scanning electron microscope（SEM）and transmission electron microscopy（TEM）to observe the composition,phase,and morphology of the nanostructure.Magnetic measurements by Vibrating Sample Magnetometer（VSM）.The as-preparaed Fe₃O₄@C nanocomposites were employed as adsorbent materials for the removal of methyl orange（MO）from aqueous solution.The influence of experimental parameters,including solution pH,initial MO concentration,and contact time were studied.The Fe₃O₄@C adsorption capacity towards was 66.04 mg/g.The adsorption kinetic of MO on Fe₃O₄@C could be fitted well by the pseudo-second-order model.The Langmuir isotherm model fitted MO adsorption isotherm better than the Freundlich model.2.Preparation and characterization of cluster type CuO and its catalytic propertiesHydrothermal method was used to prepare CuO particles.XRD and SEM were used to character the structure and morphology of as-prepared CuO.Rhodamine B（RhB）solution acted as simulated pollutions to test the capacity of the as-prepared CuO assisted with H₂O₂.The experiment was conducted mainly to figure out the differences between the reaction in visual and dark circumstance.In addition,the parameters（concentration of RhB solution,the amount of CuO and H₂O₂）of catalytic degradation in dark circumstance were researched to find the major factors.The three parameters influenced each other in the degradation.RhB solutions can be decomposed more quickly in visual than that in dark circumstance.3.the synthesis of CoNiMnP magnetic films and its propertiesThe CoNiMn magnetic films were induced through electrodeposition process by adding a magnetic field parallel to the electric field.The effects of the magnetic field on electrochemical properties,structure,morphology,and magnetic properties were studied.Then,the adsorption performance of magnetic films synthesized under different current densities was tested.It was found that the cathode current and electro-deposition efficiency were improved in parallel magnetic field.What’s more,the crystal structure can be formed better and the preferred orientation is obvious.The crystallinity of deposited film and magnetic property can be increased.At different current densities,the adsorption performance of the synthesized film prepared at low current density is better than that at high current density.