Preparation Of Ferriferrous Oxide Magnetic Nanoparticles Encapsulated Multiwalled Carbon Nanotubes And Research On Absorption And Enhancement Properties

Carbon nanotubes have attracted much attention and research because of their special structure, they have large specific surface area,large aspect ratio and excellent mechanical and electrical properties. They have been not only widely used as nano-reinforcement in composites but also widely used as a adsorbent in the field of dye absorption. However,due to the problem of poor dispersibility, poor interfacial bonding and random distribution of carbon nanotubes in the matrix of composite materials, and the difficulty in separation and removal when used as dye adsorbents, which greatly limits its application in the field of composite materials and dye adsorption, the methods of chemical modification,outside force field and magnetic field are commonly used to resolve the issue.In this paper, the preparation of carbon nanotubes Fe3O4 @ MWNTs hybrids with internal magnetic particles was studied systematically. The morphology, composition and magnetic particle loading level of Fe3O4 @MWNTs were studied qualitatively and quantitatively, and the effects of magnetic field strength, viscosity of dispersion medium and other factors on the orientation of Fe3O4 @ MWNTs were analyzed, and the magnetization orientation behavior was quantitatively characterized, then the dye absorption properties of Fe3O4 @ MWNTs was researched , the effect of dye absorption time and the initial concentration of dye to the balanced amount of adsorption were studied systematically.In this paper, by the nitric acid reflux and hydrothermal method,Fe304 nanoparticles were successfully encapsulated into the tube of carbon nanotubes by capillary action. By FTIR?XRD?Raman?TGA?TEM?SEM?AFM and VSM characterizations of carbon nanotubes, the results show that the successfully designed of magnetic carbon nanotubes filled with Fe304 nanoparticles, and the magnetic particle loading level can be quantitative calculation . Carbon nanotubes modified to achieve the degree of orientation controlled, for the next experimental research and practical application to be the groundwork.In this experiment, the effects of the intensity of the applied magnetic field and the nature of the dispersion medium on the orientation degree of Fe3O4 @ MWNTs were investigated. The relative orientation degree of the modified carbon nanotubes were quantitatively characterized by the simulation method of matrix ellipses, and the degree of orientation can be controlled; the effect of various factors on the adsorption capacity of Fe3O4@MWNTs hybrids in the field of dye adsorption was studied systematically. The modified carbon nanotubes can achieve good adsorption capacity and the Fe304@MWNTs can be easily separated and removed from the adsorption system under the action of magnetic field.