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首页> 外文期刊>RSC Advances >Multifunctional nanocomposite Fe3O4@SiO2-mPD/SP for selective removal of Pb(II) and Cr(VI) from aqueous solutions
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Multifunctional nanocomposite Fe3O4@SiO2-mPD/SP for selective removal of Pb(II) and Cr(VI) from aqueous solutions

机译：用于从水溶液中选择性去除Pb（II）和Cr（VI）的多功能纳米复合Fe3O4 @ SiO2-mPD / SP

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Silica-coated magnetite (Fe3O4@SiO2) nanoparticles functionalized with amino, imino and sulfonic groups (Fe3O4@SiO2-mPD/SP) were successfully synthesized via a facile chemical oxidative polymerization of m-phenylenediamine (mPD) and m-sulfophenylenediamine-4-sulfonic acid (SP) monomers, and utilized for selective removal of Pb(II) and Cr(VI) from aqueous solutions. It was revealed by the characterizations that the polymers formed on Fe3O4@SiO2 nanoparticles were the true copolymers with a mPD-SP unit, rather than a mixture of mPD and SP homopolymers. Fe3O4@SiO2-mPD/SP nanocomposites could be easily separated from aqueous solutions within 30 s. The maximum adsorption capacities of Pb(II) (83.23 mg g(-1)) and Cr(VI) (119.06 mg g(-1)) on Fe3O4@SiO2-mPD/SP nanocomposites were obtained at the mPD/SP molar ratios of 95 : 5 and 50 : 50, respectively. Moreover, satisfactory selective removal of Pb(II) and Cr(VI) from their mixtures with Cu(II) and Ni(II) ions were exhibited by the Fe3O4@SiO2-mPD/SP (95 : 5) and Fe3O4@SiO2-mPD/SP (50 : 50), respectively. The Pb(II) adsorption equilibrium was reached within 5 min by Fe3O4@SiO2-mPD/SP (95 : 5). The adsorption data of Pb(II) and Cr(VI) were both fitted well to the Freundlich isotherm and followed the pseudo-second-order kinetic model. The adsorption mechanism of Pb(II) and Cr(VI) on Fe3O4@SiO2-mPD/SP nanocomposites included five processes, namely: ion-exchange, complexation adsorption, reduction reaction, electrostatic attraction and physical adsorption. The enhanced adsorption performance of nanoparticle-based magnetic adsorbents for selective removal of heavy metal ions can be achieved with such a copolymerization strategy.
机译：通过间苯二胺（mPD）和间磺基苯二胺-4-的简便化学氧化聚合，成功合成了具有氨基，亚氨基和磺酸基团（Fe3O4 @ SiO2-mPD / SP）的二氧化硅包覆的磁铁矿（Fe3O4 @ SiO2）纳米颗粒。磺酸（SP）单体，并用于从水溶液中选择性去除Pb（II）和Cr（VI）。这些特征表明，在Fe3O4 @ SiO2纳米颗粒上形成的聚合物是真正的具有mPD-SP单元的共聚物，而不是mPD和SP均聚物的混合物。 Fe3O4 @ SiO2-mPD / SP纳米复合材料很容易在30 s内与水溶液分离。在mPD / SP摩尔比下获得了Fe3O4 @ SiO2-mPD / SP纳米复合材料上Pb（II）（83.23 mg g（-1））和Cr（VI）（119.06 mg g（-1））的最大吸附容量。分别为95：5和50:50。此外，Fe3O4 @ SiO2-mPD / SP（95：5）和Fe3O4 @ SiO2-显示出令人满意的选择性去除Pb（II）和Cr（VI）的混合物中的Cu（II）和Ni（II）离子。 mPD / SP（50：50）。 Fe3O4 @ SiO2-mPD / SP（95：5）在5分钟内达到Pb（II）吸附平衡。 Pb（II）和Cr（VI）的吸附数据均很好地拟合了Freundlich等温线，并遵循了伪二级动力学模型。 Fe3O4 @ SiO2-mPD / SP纳米复合材料对Pb（II）和Cr（VI）的吸附机理包括离子交换，络合吸附，还原反应，静电吸引和物理吸附五个过程。通过这种共聚策略可以实现用于选择性去除重金属离子的基于纳米颗粒的磁性吸附剂的增强的吸附性能。

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