Sereshti Hassan, Amirafshar Atiyeh, Kadi Ammar, Rashidi Nodeh Hamid, Rezania Shahabaldin, Hoang Hien Y, Barghi Anahita, Vasseghian Yasser
Department of Chemistry, Faculty of Science, University of Tehran, Tehran, Iran.
Department of Chemical Engineering, Faculty of Engineering, Ferdowsi University of Mashhad, P.O. Box 91779-48944, Mashhad, Iran.
Chemosphere. 2023 Apr;320:138065. doi: 10.1016/j.chemosphere.2023.138065. Epub 2023 Feb 6.
Pesticides are a large group of pristine organic contaminants, which are widely discharged into environmental water due to agricultural activities. Hence, extraction, determination, and removal of pesticides from water resources are necessary for human health. In this study, novel adsorbent was developed based on three-dimensional magnetic graphene coated with gold nanoparticles (3D-MG@AuNPs) for extraction of chlorpyrifos, dicrotophos, fenitrothion, and piperophos as four specific organophosphorus pesticides (OPPs) from wastewater and tap water samples. The proposed nanocomposite was characterized; FTIR and EDX are performed for the expected functional groups and elemental analysis, SEM showed the unique and spherical AuNPs are well dispersed over graphene sheets. In this investigation, the important parameters that have effect on the extraction efficiency, including the desorbing solvent, desorbing solvent volume, vortex time, the extraction time, adsorbent dosage, pH of sample solutions, and salt effect were evaluated. In conclusion, the measured amounts of the chosen OPPs were determined using the gas chromatography microelectron capture (μECD-GC) method. Limits of quantification (S/N ratio of 10) and detection (S/N ratio of 3) were attained at concentrations of 0.26-0.43 μg.L and 0.08-0.14 μg.L, respectively. According to the results of the investigations, the synthesized 3D-MG@AuNPs did not require any complicated sample preparation methods; therefore, it is a very good choice for solid magnetic phase extraction studies.
农药是一大类原始有机污染物，由于农业活动而被广泛排放到环境水体中。因此，从水资源中提取、测定和去除农药对人类健康至关重要。在本研究中，基于包覆金纳米粒子的三维磁性石墨烯（3D-MG@AuNPs）开发了新型吸附剂，用于从废水和自来水样品中萃取毒死蜱、百治磷、杀螟硫磷和哌草磷这四种特定的有机磷农药（OPPs）。对所提出的纳米复合材料进行了表征；通过傅里叶变换红外光谱（FTIR）和能谱分析（EDX）对预期的官能团和元素进行了分析，扫描电子显微镜（SEM）显示独特的球形金纳米粒子在石墨烯片上分散良好。在本研究中，评估了影响萃取效率的重要参数，包括解吸溶剂、解吸溶剂体积、涡旋时间、萃取时间、吸附剂用量、样品溶液的pH值和盐效应。总之，采用气相色谱微电子捕获（μECD-GC）法测定了所选OPPs的含量。定量限（信噪比为10）和检测限（信噪比为3）分别为0.26 - 0.43μg.L和0.08 - 0.14μg.L。根据研究结果，合成的3D-MG@AuNPs不需要任何复杂的样品制备方法；因此，它是固体磁性相萃取研究的一个非常好的选择。
