Abstract Magnetite nano-particles (MNPs) have better potential in environmental, biomedical, and clinical use, because they have several unequaled properties. This study was conducted to investigate the preparation and use of grafted β‑cyclodextrin/thermo-sensetive polymer onto modified Fe3O4@SiO2 nano-particles (MNPs-AGENVC-CD) for the removal of fenitrothion from aqueous solution. MNPs were synthesized and characterized by using X-ray diffraction (XRD), FT-IR spectroscopy, vibrating sample magnetometer (VSM), scanning electron microscopy (SEM-EDX), elemental analysis (CHN), thermo-gravimetric analysis (TGA), and transmission electron microscopy (TEM). The effect of some operational parameters, such as pH value, adsorption isotherms, sorption kinetics, reusability, adsorption/desorption temperature, and ultrasound effect on desorption of fenitrothion removed from aqueous solution were examined. In this study, the optimized parameters were also tested for pesticide removed from real water samples. The results showed that the best sorption of fenitrothion on the MNPs-AGENVC-CD took place at 25 °C and optimum pH of 6. The initial concentration and nano-sorbent dosage were 100 mg L−1 and 0.01 g, respectively. The kinetic study showed that the best time for the pesticide sorption was 5 min. Also, the pseudo-second-order model used fitted the adsorption kinetics well, thus exhibiting high correlation coefficients. Fenitrothion sorption capacity was found to be 30 mg g−1. The equilibrium data of fenitrothion modified by the MNPs-sorbent were correctly shown by Langmuir, Freundlich, Redlich-Peterson, and Temkin models. The data fitted well to Langmuir equation, thus showing the monolayer adsorption. According to the results, fenitrothion adsorption efficiency by MNPs-AGENVC-CD from aqueous solution and real water samples was >99%. Therefore, the proposed method was the promising method for the adsorption of fenitrothion.

中文翻译：

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改性Fe3O4@SiO2纳米颗粒上接枝β-环糊精/热敏聚合物的制备及应用，用于去除水溶液中的杀螟蛉

摘要 磁铁矿纳米颗粒 (MNPs) 在环境、生物医学和临床应用中具有更好的潜力，因为它们具有多种无与伦比的特性。本研究旨在研究接枝 β-环糊精/热敏聚合物在改性 Fe3O4@SiO2 纳米颗粒 (MNPs-AGENVC-CD) 上的制备和使用，以去除水溶液中的杀螟。通过使用 X 射线衍射 (XRD)、FT-IR 光谱、振动样品磁强计 (VSM)、扫描电子显微镜 (SEM-EDX)、元素分析 (CHN)、热重分析 (TGA)、和透射电子显微镜（TEM）。一些操作参数的影响，如 pH 值、吸附等温线、吸附动力学、可重复使用性、吸附/解吸温度、并检查了超声波对从水溶液中去除的杀螟虫解吸的影响。在本研究中，还测试了从实际水样中去除的农药的优化参数。结果表明，杀螟硫磷在 MNPs-AGENVC-CD 上的最佳吸附发生在 25 °C 和最适 pH 值为 6 时。初始浓度和纳米吸附剂用量分别为 100 mg L-1 和 0.01 g。动力学研究表明，农药吸附的最佳时间为 5 分钟。此外，使用的准二级模型很好地拟合了吸附动力学，因此表现出高相关系数。发现 Fenitrothion 吸附容量为 30 mg g-1。Langmuir、Freundlich、Redlich-Peterson 和 Temkin 模型正确显示了 MNP 吸附剂修饰的杀螟硫磷的平衡数据。数据与朗缪尔方程拟合良好，显示了单层吸附。结果表明，MNPs-AGENVC-CD从水溶液和真实水样中吸附杀螟蛉的效率>99%。因此，所提出的方法是吸附杀螟的有前途的方法。