AbstractThe authors describe the preparation of a nanocomposite (mag-MoS2-Fe3O4) that was prepared from molybdenum disulfide (MoS2) and magnetic Fe3O4 nanoparticles by a hydrothermal method in an inert atmosphere. The composite is shown to be a viable magnetic adsorbent for dispersive solid phase microextraction of lead(II) and copper(II) ions from water and plant samples. The nanocomposite was characterized by FT-IR, Raman spectroscopy, XRD, SEM, and BET methods. The factors affecting the extraction recovery of the analytes, including the pH value, type of dispersive solvent, sample volume, type and volume of eluent solution, and interfering ions, were optimized. Flame atomic absorption spectrometry was then used for quantitation. Figures of merit of this method include a preconcentration factor of 50 for lead(II) and 35 for Cu(II), LODs of 3.3 μg·L−1 for lead(II) and of 1.8 μg·L−1 for Cu(II), and RSDs of 4.9 and 1.5%, respectively. The method was used to preconcentrate the analytes from plant and water samples prior to their determination by FAAS. It was then validated by analyzing certified reference materials (water and plant), and this resulted in good accuracy. Graphical abstractSchematic presentation of a nanocomposite (mag-MoS2-Fe3O4) that was prepared from molybdenum disulfide (MoS2) and magnetic Fe3O4 nanoparticles by a hydrothermal method in an inert atmosphere for the solid phase microextraction of lead and copper at trace levels.

中文翻译：

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磁性 MoS2-Fe3O4 纳米复合材料作为有效吸附剂，用于在 FAAS 测定之前对铅 (II) 和铜 (II) 进行分散固相微萃取

摘要作者描述了一种纳米复合材料 (mag-MoS2-Fe3O4) 的制备过程，该复合材料由二硫化钼 (MoS2) 和磁性 Fe3O4 纳米颗粒在惰性气氛中通过水热法制备。该复合材料被证明是一种可行的磁性吸附剂，可用于从水和植物样品中分散固相微萃取铅 (II) 和铜 (II) 离子。通过FT-IR、拉曼光谱、XRD、SEM和BET方法对纳米复合材料进行表征。对影响分析物提取回收率的因素包括pH值、分散溶剂类型、样品体积、洗脱液类型和体积、干扰离子等进行了优化。然后使用火焰原子吸收光谱法进行定量。该方法的品质因数包括铅 (II) 的预浓缩因子为 50，铜 (II) 的预浓缩因子为 35，LOD 为 3。铅 (II) 为 3 μg·L-1，Cu(II) 为 1.8 μg·L-1，RSD 分别为 4.9% 和 1.5%。该方法用于预浓缩植物和水样中的分析物，然后再通过 FAAS 进行测定。然后通过分析经认证的参考材料（水和植物）对其进行验证，这导致了良好的准确性。图形摘要示意图表示由二硫化钼 (MoS2) 和磁性 Fe3O4 纳米粒子在惰性气氛中通过水热法制备的纳米复合材料 (mag-MoS2-Fe3O4)，用于固相微萃取痕量铅和铜。然后通过分析经认证的参考材料（水和植物）对其进行验证，这导致了良好的准确性。图形摘要示意图表示由二硫化钼 (MoS2) 和磁性 Fe3O4 纳米粒子在惰性气氛中通过水热法制备的纳米复合材料 (mag-MoS2-Fe3O4)，用于固相微萃取痕量铅和铜。然后通过分析经认证的参考材料（水和植物）对其进行验证，这导致了良好的准确性。图形摘要示意图表示由二硫化钼 (MoS2) 和磁性 Fe3O4 纳米粒子在惰性气氛中通过水热法制备的纳米复合材料 (mag-MoS2-Fe3O4)，用于固相微萃取痕量铅和铜。