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Magnetic layered double hydroxide/zeolitic imidazolate framework-8 nanocomposite as a novel adsorbent for enrichment of four endocrine disrupting compounds in milk samples
Journal of Hazardous Materials ( IF 13.6 ) Pub Date : 2021-07-28 , DOI: 10.1016/j.jhazmat.2021.126753
Xin Di 1 , Hanyang Wang 2 , Xiaoli Guo 3 , Xin Wang 4 , Youping Liu 4 , Xin Di 4
Affiliation  

For the first time, a novel nanocomposite, zeolitic imidazolate framework/magnetic layered double hydroxide (Fe3O4@LDH/ZIF), was successfully fabricated through in situ synthetic method with Fe3O4 as magnetic core and composite as shell. The resulting materials were characterized by XRD, TEM, FT-IR, VSM, TGA and nitrogen adsorption-desorption analysis. The Fe3O4@LDH/ZIF was employed as a sorbent in dispersive micro-solid phase extraction (D-μ-SPE) for enrichment of four endocrine disrupting compounds (EDCs) from milk samples prior to ultra-high performance liquid chromatography coupled with tandem mass spectrometry (UHPLC-MS/MS) analysis. The synthesized nanocomposite showed bigger specific surface area and better absorption capacity than Fe3O4@LDH. The equilibrium adsorption capacities (Qe, mg/g) of EDCs on the Fe3O4@LDH/ZIF reached up to 47.4–138.8 mg/g, mainly resulting from hydrogen bonding, π-π interaction and electrostatic interaction between EDCs and nanocomposite. Several variables affecting the extraction efficiency were investigated and optimized. The method displays low limits of detection (3–15 ng L−1), good linearity (10–5000 ng L−1), acceptable precision (RSD < 7.8%) and accuracy (RE < 5.2%). Satisfactory repeatability was obtained with RSD in the range of 1.2–7.8%. This work provides a promising approach for the development of new sorbent media in sample preparation for the improvement of analytical performance.



中文翻译:

磁性层状双氢氧化物/沸石咪唑酯骨架-8 纳米复合材料作为一种新型吸附剂,用于富集牛奶样品中的四种内分泌干扰化合物

首次以Fe 3 O 4为磁芯,复合材料为壳,通过原位合成法成功制备了新型纳米复合材料,沸石咪唑骨架/磁性层状双氢氧化物(Fe 3 O 4 @LDH/ZIF)。通过XRD、TEM、FT-IR、VSM、TGA和氮吸附-解吸分析对所得材料进行表征。Fe 3 O 4@LDH/ZIF 被用作分散微固相萃取 (D-μ-SPE) 中的吸附剂,用于在超高效液相色谱与串联质谱联用之前从牛奶样品中富集四种内分泌干扰化合物 (EDC)。 UHPLC-MS/MS) 分析。合成的纳米复合材料比 Fe 3 O 4 @LDH具有更大的比表面积和更好的吸收能力。EDCs 在 Fe 3 O 4上的平衡吸附容量 (Qe, mg/g)@LDH/ZIF 达到 47.4–138.8 mg/g,主要是由于 EDC 与纳米复合材料之间的氢键、π-π 相互作用和静电相互作用。对影响提取效率的几个变量进行了研究和优化。该方法显示出低检测限 (3–15 ng L -1 )、良好的线性 (10–5000 ng L -1 )、可接受的精密度 (RSD < 7.8%) 和准确度 (RE < 5.2%)。RSD 在 1.2-7.8% 范围内获得了令人满意的重复性。这项工作为在样品制备中开发新的吸附介质以提高分析性能提供了一种有前景的方法。

更新日期:2021-08-05
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