| The experiments mainly involved in this paper are to study the synthesis of magneticnanomaterials under different conditions, and by changing the initial reaction of theexperiment conditions to the ultimate control of crystal growth and morphology. Besides,the application prospects of the magnetic adsorbents in sewage treatment are measured. Themain contents and results are as follows:1． Magnetic Fe3O4/activated carbon (Fe3O4/AC) lamellar structured nanocomposite hasbeen synthesized by a facile, economic and environmentally friendly method. Thestraws are low-cost and easily converted into AC by carbonization. Fe3O4/ACnanocomposite was high specific surface area about1531m2/g and high saturationmagnetization about18.1emu/g. Because of such high specific surface area ofFe3O4/AC, the adsorption ability of Fe3O4/AC nanocomposite for organic dye isinvestigated. It was found that100mg/L of Congo red could be removed90%fromaqueous solution within30min, and then it can be recovered quickly by a magnet,suggesting its potential as a promising adsorbent for water treatment, and also providesnew insight into the design and development of magnetic-recycling and magneticnonmaterial based on carbon.2． The face-centered cubic metallic nickel with shapes of spherical, uniform size andhigh dispersion had been successfully synthesized via a one-pot solvothermal method,in which hydrazine hydrate acted as the reducing agent. By etching effort of Fe3+, thesurface morphology of the spherical nickel’s adsorption performance had been greatlyimproved. Congo red (CR) was used as a traditional solutions to evaluate etched nickelmicrospheres’ sewage treatment capability. Furthermore, the probable etchingmechanism of the nickel microspheres was discussed. In the process of etching, thedegree of nickel microspheres etching could be easily controlled by adjusting theexperimental parameters, including molar ratio, solvent types and bath time. |
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