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A sodium modified reduced graphene oxide-Fe3O4 nanocomposite for efficient lead(II) adsorption

机译：钠改性的氧化石墨烯-Fe3O4纳米复合材料，可有效吸附铅（II）

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摘要

A simple, cost-effective and facile route was employed to synthesize a hydrophobic sodium modified reduced graphene oxide-magnetic iron oxide (SMGI) nanocomposite. The as-synthesized SMGI material was used as an adsorbent material for the removal of Pb(II) from aqueous solutions. The detailed characterization of the SMGI nanocomposite prepared was performed using material characterization techniques. X-Ray Diffraction (XRD) and Fourier transform infrared spectroscopic (FTIR) studies confirm the deposition of crystalline Fe3O4 nanoparticles on reduced graphene oxide (rGO). X-ray photoelectron spectroscopic (XPS) analysis shows the presence of 10% sodium cations in the nanocomposite. Transmission Electron Microscopy (TEM) images reveal that the magnetite nanoparticles are homogenously deposited on the 2-dimensional surface of the graphene sheets. The nanocomposite prepared possesses a superparamagnetic property, which was exploited for the easy recovery of the SMGI nanocomposite from water after Pb(II) adsorption. The effects of pH, contact time and concentration on Pb(II) sorption were investigated in detail. The sorption data were fitted using Freundlich and Langmuir models. The pseudo-second-order model was a better fit for Pb(II) adsorption. The maximum adsorption capacity of 1666.66 +/- 59 mg g(-1) was obtained. The adsorbent also showed more than 75% removal efficiency of Pb(II) after 3 cycles of regeneration.
机译：采用一种简单，经济有效且简便的方法来合成疏水性钠修饰的还原型氧化石墨烯-磁性氧化铁（SMGI）纳米复合材料。合成后的SMGI材料用作吸附剂材料，用于从水溶液中去除Pb（II）。使用材料表征技术对所制备的SMGI纳米复合材料进行了详细的表征。 X射线衍射（XRD）和傅里叶变换红外光谱（FTIR）研究证实，结晶的Fe3O4纳米颗粒在还原的氧化石墨烯（rGO）上沉积。 X射线光电子能谱（XPS）分析显示，纳米复合材料中存在10％的钠阳离子。透射电子显微镜（TEM）图像显示磁铁矿纳米颗粒均匀沉积在石墨烯片的二维表面上。制备的纳米复合材料具有超顺磁性，可用于吸附Pb（II）后从水中轻松回收SMGI纳米复合材料。详细研究了pH，接触时间和浓度对Pb（II）吸附的影响。吸附数据使用Freundlich和Langmuir模型拟合。拟二级模型更适合于Pb（II）吸附。获得的最大吸附容量为1666.66 +/- 59 mg g（-1）。在3个再生周期后，吸附剂还显示出超过75％的Pb（II）去除率。

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