Citation: WEI Shi-Yong, YANG Xiao-Hong. Preparation, Characterization and Adsorption Characteristics for Pb(Ⅱ) of Fe3O4 and Ni-Doped Fe3O4 Nanoparticles[J]. Chinese Journal of Inorganic Chemistry, ;2013, 29(12): 2615-2622. doi: 10.3969/j.issn.1001-4861.2013.00.377
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Nanocrystalline magnetite (Fe3O4) and Ni-doped magnetites (NixFe3-xO4, x=0.1, 0.3, and 0.6) were prepared by a modified coprecipitation procedure, and their surface properties and application for the removal of Pb(Ⅱ) ions from aqueous solutions were characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen physical adsorption, potentiometric titrations and batch adsorption experiments. Results show that all the samples are single-phase crystalline nanoparticles with an approximately spherical shape. Compared to Fe3O4, the particle size, the pHpzc value and the surface charge at pH=5.0 for NixFe3-xO4 nanoparticles are decreased; and the pore volume, specific surface area (SSA), surface fractal dimension and the content of surface hydroxyls are increased. Langmuir correlation coefficients for Pb(Ⅱ) adsorption on the samples are fairly high (R2=0.9942~0.9858) and they follow the order: Fe3O4>Ni0.1Fe2.9O4>Ni0.3Fe2.7O4=Ni0.6Fe2.4O4, and those of Freundlich model are relatively low (R2=0.9813~0.9477) and the order is opposite to Langmuirs. At pH=5.0, Langmuir adsorption capacities (qmax) of Fe3O4, Ni0.1Fe2.9O4, Ni0.3Fe2.7O4 and Ni0.6Fe2.4O4 are 6.02, 6.68, 7.29, and 8.34 mg·g-1, respectively. Compared to Fe3O4, NixFe3-xO4 nanoparticles with a high content of Ni have a higher adsorption capacity for the Pb(Ⅱ) ions in aqueous solutions.
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