Triethylenetetramine-Grafted Magnetite Graphene Oxide-Based Surface-Imprinted Polymer for the Adsorption of Ni(II) in Food Samples,Journal of Chemical & Engineering Data

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Triethylenetetramine-Grafted Magnetite Graphene Oxide-Based Surface-Imprinted Polymer for the Adsorption of Ni(II) in Food Samples
Journal of Chemical & Engineering Data ( IF 2.0 ) Pub Date : 2020-12-14 , DOI: 10.1021/acs.jced.0c00751
Aminul Islam ₁ , Hina Javed ₁ , Anjali Chauhan ₁ , Izhar Ahmad ₁ , Saman Rais ₁

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In this work, a hydrophilic sandwich-like graphene oxide (GO) ion-imprinted polymer (IIP) was synthesized via the surface imprinting technique to develop a dispersive magnetic solid-phase extraction method for the preconcentration of Ni(II) by flame atomic absorption spectrometry (FAAS). In this imprinted polymer, allyl-rich amines (monomer) and ethylene glycol dimethacrylate (EGDMA) (cross-linker) act as platforms for Ni(II) recognition. Most importantly, the influence of other transition metals as well as alkali/alkaline earth metals in the samples was evaluated to compare the imprinting effect between IIP and nonimprinted polymer (NIP) as a control. The IIP for Ni(II) in a binary mixture provides >99% recovery with a good selectivity coefficient, whereas NIP could not recognize a specific metal ion from competitive ions due to the absence of imprinting effect. Moreover, the introduced specific binding sites with complementary shapes and sizes for Ni(II) recognition in IIP exhibited high adsorption capacity as compared to NIP and fast chemical kinetics with a pseudo-second-order model. The ease of separation from aqueous solutions by an external magnet is facilitated due to embedded Fe₃O₄ nanoparticles. By utilizing nonlinearized isotherm modeling, two-parameter models (Langmuir, Freundlich, and Dubinin–Radushkevich) and three-parameter models (Redlich–Peterson and Sips) were analyzed with error analysis (reduced χ², residual root-mean-square error (RMSE), and sum squares error (SSE)). Additionally, the structural modifications of GO were examined by Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), and atomic force microscopy (AFM). No significant difference was found in FTIR spectra of IIP and NIP. Accuracy was presented by SRM and recovery studies. The synthesized sorbent possesses high recognition ability even after seven regeneration cycles, illustrating potential applications for Ni(II) determination in various food and water samples.

中文翻译：

三亚乙基四胺接枝磁铁矿氧化石墨烯基表面印迹聚合物对食品样品中镍（II）的吸附

在这项工作中，通过表面压印技术合成了一种亲水性夹心状氧化石墨烯（GO）离子印迹聚合物（IIP），从而开发了一种分散磁性固相萃取法，用于通过火焰原子吸收法对镍（II）进行预浓缩。光谱法（FAAS）。在这种印迹聚合物中，富含烯丙基的胺（单体）和乙二醇二甲基丙烯酸酯（EGDMA）（交联剂）充当Ni（II）识别的平台。最重要的是，评估了样品中其他过渡金属以及碱金属/碱土金属的影响，以比较IIP和作为对照的非压印聚合物（NIP）的压印效果。二元混合物中Ni（II）的IIP可提供> 99％的回收率和良好的选择性系数，而NIP由于没有印迹效应，无法从竞争离子中识别出特定的金属离子。此外，与NIP相比，所引入的具有互补形状和大小的互补结合位点，用于IIP中的Ni（II）识别，与NIP相比，具有较高的吸附能力，并具有拟二级模型的快速化学动力学。由于嵌入了铁，因此易于通过外部磁体与水溶液分离₃ O ₄纳米粒子。通过利用非线性化等温线模型，双参数模型（朗缪尔，Freundlich吸附，和杜比宁-Radushkevich）和三参数模型（瑞德利奇-Peterson和SIPS），错误分析进行分析（还原的χ ²，剩余均方根误差（RMSE）和和平方误差（SSE））。此外，通过傅立叶变换红外（FTIR）光谱，X射线衍射（XRD），扫描电子显微镜（SEM），透射电子显微镜（TEM），热重分析（TGA）和原子力检查了GO的结构修饰显微镜（AFM）。在IIP和NIP的FTIR光谱中未发现明显差异。SRM和恢复研究表明了准确性。合成的吸附剂即使在七个再生循环后仍具有很高的识别能力，说明了在各种食品和水样中测定Ni（II）的潜在应用。

更新日期：2021-01-14

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