Abstract

In this study, a novel sonochemically synthetic process of superparamagnetic and monodisperse magnetite nanoparticles from the Egyptian hematite ore has been done. Then the synthesized magnetite nanoparticles were subjected to surface modification through coating by polyethylene glycol to obtain stabilized and biocompatible magnetic nanoparticles (PEG-MN). The synthesized PEG-MN nanoparticles were characterized by the X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XRF), vibrating sample magnetometer (VSM), infrared spectroscopy (FT-IR), adsorption of nitrogen (BET method), field emission scanning electron microscopy (FE-SEM), high-resolution transmission electron microscopy (HR-TEM), and Raman spectroscopy. The results showed that the synthesized PEG-MN nanoparticles have an average crystalline size of 12 nm and 69.6% of iron oxide (Fe₃O₄) in the sample with a specific surface area of 219 m²/g. The magnetic hysteresis curve revealed that the synthesized PEG-MN nanoparticles exhibit a superparamagnetic behavior at room temperature with a saturation magnetization of 39.370 emu/g. While the morphology of the synthesized PEG-MN nanoparticles displayed a spherical shape and well-PEG coating of the magnetite particles as well as a perfect monodispersity of the particles. The reactivity of the PEG-MN nanoparticles was examined for adsorption of the cadmium ion Cd(II) from aqueous solutions. The maximum adsorption capacity of the PEG-MN nanoparticles was found to be 0.452 mg/g. The adsorption process is well fitted by the pseudo-second-order kinetic model, and the adsorption efficiency of Cd(II) was found to be 52% suggesting that the synthesized PEG-MN nanoparticles are an effective and promising tool for the removal of the selected metal.

Graphic Abstract

中文翻译：

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从赤铁矿声化学制备超顺磁性/单分散PEG包覆的磁铁矿纳米颗粒的表征，用于从水溶液中去除Cd（II）

摘要

在这项研究中，已经完成了从埃及赤铁矿矿石中超顺磁性和单分散磁铁矿纳米粒子的声波化学合成新工艺。然后将合成的磁铁矿纳米粒子通过聚乙二醇涂层进行表面改性，以获得稳定且生物相容的磁性纳米粒子（PEG-MN）。通过X射线衍射（XRD），X射线光电子能谱（XRF），振动样品磁力计（VSM），红外光谱（FT-IR），氮吸附（BET法）对合成的PEG-MN纳米颗粒进行表征。场发射扫描电子显微镜（FE-SEM），高分辨率透射电子显微镜（HR-TEM）和拉曼光谱。结果表明，合成的PEG-MN纳米颗粒的平均晶体尺寸为12 nm，氧化铁（Fe₃ O ₄），比表面积为219 m ²/G。磁滞曲线显示，合成的PEG-MN纳米粒子在室温下表现出超顺磁行为，饱和磁化强度为39.370 emu / g。合成的PEG-MN纳米颗粒的形貌表现为球形，磁铁矿颗粒具有良好的PEG涂层，并且颗粒具有完美的单分散性。检查了PEG-MN纳米颗粒的反应性，以从水溶液中吸附镉离子Cd（II）。发现PEG-MN纳米颗粒的最大吸附容量为0.452mg / g。拟二级动力学模型很好地拟合了吸附过程，发现Cd（II）的吸附效率为52％，这表明合成的PEG-MN纳米颗粒是一种有效的有前途的去除工具。选定的金属。

图形摘要