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材料科学
Graphene oxide wrapped magnetic nanoparticle composites induced by SiO_2 coating with excellent regenerability
Graphene oxide(GO) wrapped Fe_3O_4 nanoparticles(NPs) were prepared by coating the Fe_3O_4 NPs with a SiO_2 layer, and then modifying by amino groups, which interact with the GO nanosheets to form covalent bonding. The SiO_2 coating layer plays a key role in integrating the magnetic nanoparticles with the GO nanosheets. The effect of the amount of SiO_2 on the morphology, structure, adsorption, and regenerability of the composites was studied in detail. An appropriate SiO_2 layer can effectively induce the GO nanosheets to completely wrap the Fe_3O_4 NPs, forming a core-shell Fe_3O_4@SiO_2@GO composite where Fe_3O_4@SiO_2 NPs are firmly encapsulated by GO nanosheets. The optimized Fe_3O_4@SiO_2@GO sample exhibits a high saturated adsorption capacity of 253 mg·g~(-1) Pb(Ⅱ) cations from wastewater, and the adsorption process is well fitted by Langmuir adsorption model. Notably, the composite displays excellent regeneration, maintaining a ~90% adsorption capacity for five cycles, while other samples decrease their adsorption capacity rapidly. This work provides a theoretical guidance to improve the regeneration of the GO-based adsorbents.
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International Journal of Minerals Metallurgy and Materials
2021年12期
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