| At present, the influence of the oil spill on the marine environment and biology is more and more grave, and emergency treatment for offshore oil spill becomes the main method. However, how to deal with the oil film whose thickness is only10μm or less effectively (close to the limit of the oil film), and reduce the depth hazards to the marine is a daunting challenge in the future. In this paper, we exploited a novel, no secondary pollution, environment-friendly, and recycling oil-absorbent material based on the previous research, and this material has a strong property of magnetic response, hydrophobicity, adsorption and floating. This paper mainly around three aspects:Preparation of hollow magnetic core Fe3O4by solvothermal method, coating magnetic core with fine emulsion method as well as the study on the properties of the material for oil adsorption, as follows:(1) Hollow Fe3O4magnetic nanoparticles were preparated by one-step solvothermal method with FeCl3·6H2O as iron source, and analyze the morphology and crystal structure phase by some characterization methods, such as TEM, SEM, TGA, VSM, FT-IR and XRD. Then, we explored the affect of the dosage for NH4OAc, reaction time and temperature on the nanoparticles’hollowness, morphology and dispersion, and we had the best preparation conditions. The results showed that when NH4OAc, reaction time and reaction temperature were taken4.0g,10h, and200℃respectively, the morphology, dispersion and hollowness of hollow Fe3O4magnetic nanoparticles were the best, and particle size was about200～300nm with highly purity. Further more, we studied the synthesis reaction mechanism of the hollow Fe3O4magnetic nanoparticles based on the experimental results.(2) The magnetic nanocomposites coated with polystyrene were obtained by fine emulsion method, and Fe3O4was as magnetic core, the monomer was styrene. The morphology and composition structure were studied with TEM, SEM, XRD, FT-IR, TGA, CAs, VSM and TDA, and the best preparation conditions were gotten from searching the effects of proportion of Fe3O4and St, the dosage for surfactant SDBS on the Fe3O4@PS nanocomposites’morphology. The results showed that when the proportion of Fe3O4and St was75mg:1mL, the quantity of SDBS was0.05g, particle morphology of prepared Fe3O4@PS nanocomposites was the best. And particle size was about400～500nm, no agglomeration. In addition, we also explored the synthesis reaction mechanism of the Fe3O4@PS nanocomposites.(3) In the article, we studied the adsorption properties of Fe3O4@PS nanocomposites for removal of three goals pollutants:crude oil, N100lubricating oil,0#diesel fuel, mainly studied the affect of adsorption time, pH value, and temperature on the adsorption capacity, as well as its regeneration capacity. The results showed that the adsorption equilibrium had been reached when the adsorption time was30min, and the adsorption rate was fast before20min; Adsorption capacity was decreasing with the temperature increasing in the range of5-30℃and it was a linear relationship between temperature and adsorption capacity; Adsorption capacity was increasing firstly, then decreasing at pH in3～12, while its hydrophobicity was greatly influenced by acidic solution. In the experiment of analyzing renewable, although, we found that the adsorption capacity q reduced gradually when the cycles number increased, but it was still considerable. |
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