Abstract The synthesis of compounds with an excellent adsorption capability plays an essential role to remove contaminants such as phthalic acid esters (PAEs) with potential carcinogenic characteristics from different food products. In this context, for the first time, a novel adsorbent (MWCNT-Fe3O4/Ag) was synthesized by using iron (magnetic agent), and silver (catalytic and surface enhancer agent) to further approach in a magnetic SPE-GC/MS method for determining of PAEs in carbonated soft drink samples. The limit of detection (LOD) and limit of quantification (LOQ) values of MSPE-GC/MS were determined in six PAEs as a range of 10.8–22.5 and 36–75 ng/L, respectively. Also, the calibration curves of PAEs were linear (R2 = 0.9981–0.9995) over the concentration level of 10.000 ng/L and the recoveries of the six PAEs were ranging from 96.60% to 109.22% with the RSDs less than 8%. Moreover, scanning electron microscopy (SEM), energy-dispersive X-ray (EDX), X-ray diffraction (XRD), vibrating sample magnetometry (VSM) and transmission electron microscopy analyses (TEM) were utilized to characterize the produced MWCNT-Fe3O4/Ag. Based on the findings, the surface of MWCNT is relatively uniform, which became coarser after loading with Fe3O4/Ag particles. Also, EDX spectrum showed the carbon (C), iron (Fe), oxygen (O), Ag and copper (Cu) are the main components of synthesized MWCNTs-Fe3O4/Ag. The successful adhesion of Fe3O4/Ag on the texture of MWCNTs using a co-precipitation method was confirmed by XRD and FT-IR assays. Additionally, excellent crystallinity and clear lattice nanocrystals fringes of prepared MWCNT-Fe3O4/Ag was demonstrated by TEM analysis. Based on the obtained VSM images, the prepared sorbent (MWCNT-Fe3O4/Ag) has the good magnetic performance for magnetic separation and extraction processes. It was concluded that the synthesized MWCNT-Fe3O4/Ag could be used as an efficient adsorbent for determining contaminants such as PAEs in different beverage samples.

中文翻译：

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用氧化铁和银纳米粒子 (MWCNT-Fe 3 O 4 /Ag) 修饰的多壁碳纳米管作为一种新型吸附剂，用于使用磁性 SPE-GC/MS 方法测定碳酸软饮料中的 PAE

摘要 合成具有优异吸附能力的化合物对于去除不同食品中具有潜在致癌特性的邻苯二甲酸酯 (PAE) 等污染物至关重要。在此背景下，首次使用铁（磁性剂）和银（催化和表面增强剂）合成了一种新型吸附剂（MWCNT-Fe3O4/Ag），以进一步接近磁性 SPE-GC/MS 方法用于测定碳酸软饮料样品中的 PAE。MSPE-GC/MS 的检测限 (LOD) 和定量限 (LOQ) 值在六个 PAE 中确定，范围分别为 10.8–22.5 和 36–75 ng/L。此外，PAE 的校准曲线在 10.000 ng/L 的浓度水平上呈线性（R2 = 0.9981–0.9995），并且六种 PAE 的回收率范围为 96.60% 到 109。22%，RSD 小于 8%。此外，利用扫描电子显微镜 (SEM)、能量色散 X 射线 (EDX)、X 射线衍射 (XRD)、振动样品磁强计 (VSM) 和透射电子显微镜分析 (TEM) 来表征产生的 MWCNT-Fe3O4 /银。根据研究结果，MWCNT 的表面相对均匀，在加载 Fe3O4/Ag 颗粒后变得更粗糙。此外，EDX 光谱显示碳 (C)、铁 (Fe)、氧 (O)、Ag 和铜 (Cu) 是合成的 MWCNTs-Fe3O4/Ag 的主要成分。XRD 和 FT-IR 分析证实了 Fe3O4/Ag 使用共沉淀法成功粘附在 MWCNTs 的纹理上。此外，TEM 分析证明了制备的 MWCNT-Fe3O4/Ag 具有优异的结晶度和清晰的晶格纳米晶条纹。基于获得的 VSM 图像，制备的吸附剂（MWCNT-Fe3O4/Ag）具有良好的磁性能，适用于磁分离和萃取过程。得出的结论是，合成的 MWCNT-Fe3O4/Ag 可用作一种有效的吸附剂，用于测定不同饮料样品中的 PAE 等污染物。