Ternary amino-functionalized magnetic illite-smectite (AMNI/S) nanocomposites were prepared via integrating two-dimensional illite-smectite nanoflakes (NI/S), magnetite nanoparticles (Fe3O4), and 3-aminopropyltriethoxysilane (APTES). The samples were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), X-ray photoelectron spectroscopy (XPS), and vibrating sample magnetometry (VSM). The results show that Fe3O4 nanoparticles can be well dispersed on NI/S flakes and the hydrolyzed APTES molecules can simultaneously bond to the hydroxyl groups of Fe3O4 and NI/S. Due to the synergetic effect, magnetic NI/S composite can graft more amount of APTES molecules rather than Fe3O4 nanoparticles or NI/S alone. When the mass ratio of NI/S:Fe3O4 is 1:1, the saturation magnetization of AMNI/S-1 is 17.4 emu/g, facilitating the efficient magnetic separation in aqueous solution. Also, AMNI/S-1 shows a maximal adsorption amount of Pb(II) ions of 227.8 mg/g calculated by the Langmuir model. The effects of initial concentration of Pb(II) ions, pH value, adsorption time, and temperature on the adsorption amount of Pb(II) ions were investigated. The adsorption kinetic models and isotherm models were applied to analyze the adsorption of Pb(II) ions, respectively. The thermodynamic analysis reveals that the adsorption of Pb(II) onto AMNI/S-1 is spontaneous and endothermic in nature. The mechanism for the adsorption of Pb(II) ions onto AMNI/S-1 is due to the surface complexation of Fe3O4 and NI/S, and the chelation of amine groups (-NH2). AMNI/S-1 can be efficiently reused and the regenerated AMNI/S-1 remains 82.91% of initial adsorption capacity after 6-cycle adsorption/desorption process. Thus, ternary AMNI/S-1 could be used as a prospective effective adsorbent.

中文翻译：

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三元氨基官能化磁性纳米伊利石-蒙脱石粘土的制备，用于吸附水溶液中的Pb（II）离子。

通过整合二维伊利石-蒙脱石纳米薄片（NI / S），磁铁矿纳米颗粒（Fe3O4）和3-氨基丙基三乙氧基硅烷（APTES），制备了三元氨基官能化的伊利石-蒙脱石（AMNI / S）纳米复合材料。通过X射线衍射（XRD），扫描电子显微镜（SEM），傅里叶变换红外光谱（FTIR），X射线光电子能谱（XPS）和振动样品磁强（VSM）对样品进行表征。结果表明，Fe3O4纳米颗粒可以很好地分散在NI / S薄片上，水解的APTES分子可以同时键合到Fe3O4和NI / S的羟基上。由于协同作用，磁性NI / S复合材料可以接枝更多数量的APTES分子，而不是单独的Fe3O4纳米颗粒或NI / S。当NI / S：Fe3O4的质量比为1：1时，AMNI / S-1的饱和磁化强度为17.4 emu / g，有利于水溶液中的有效磁分离。此外，AMNI / S-1的Langmuir模型计算得出的最大Pb（II）离子吸附量为227.8 mg / g。研究了Pb（II）离子初始浓度，pH值，吸附时间和温度对Pb（II）离子吸附量的影响。采用吸附动力学模型和等温线模型分别分析了Pb（II）离子的吸附。热力学分析表明，Pb（II）在AMNI / S-1上的吸附是自发的并且是吸热的。Pb（II）离子吸附到AMNI / S-1上的机理是由于Fe3O4和NI / S的表面络合以及胺基（-NH2）的螯合。AMNI / S-1可以有效地重复使用，经过6个周期的吸附/解吸过程，再生的AMNI / S-1仍占初始吸附容量的82.91％。因此，三元AMNI / S-1可用作预期的有效吸附剂。