Designed multifunctional ionic liquids–magnetic graphene nanocomposites as the adsorbent of MSPE for the determination of preservatives†,Analytical Methods

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Designed multifunctional ionic liquids–magnetic graphene nanocomposites as the adsorbent of MSPE for the determination of preservatives†
Analytical Methods ( IF 2.7 ) Pub Date : 2018-02-12 00:00:00 , DOI: 10.1039/c7ay02746j
Shurui Cao _{1,

2,

3} , Yaling Chen _{3,

4,

5,

6} , Lei Zhang _{1,

2,

3} , Cunxian Xi _{1,

2,

3} , Xianliang Li _{1,

2,

3} , Bobin Tang _{1,

2,

3} , Guomin Wang _{1,

2,

3} , Zhiqiong Chen _{3,

4,

5,

6}

Affiliation

A new structural design for fabricating four types of ionic liquids was successfully adapted, which was based on changing the anion of 1-vinyl-3-octylimidazolium bromide (VOIm⁺Br⁻) with benzene sulfonic acid (BenSO₃⁻), 2-naphthalene sulfonic acid (NapSO₃⁻), 1-anthraquinonesulfonic acid (AQSO₃⁻) and 1,2-naphthoquinone-4-sulfonic acid (NQSO₃⁻). Then, designed ionic liquids were directly modified on the surface of magnetic graphene oxide reduced nanoparticles (Fe₃O₄@SiO₂@G) and used as a novel magnetic adsorbent for the determination of preservatives in vegetables via ultra-high performance liquid chromatography-triple quadrupole/linear ion trap mass spectrometry (UPLC-MS/MS). In this study, the specific adsorption capacity of the four types of functional ionic liquid–magnetic graphene adsorbents was investigated. The adsorption abilities of the as-prepared novel magnetic adsorbents towards 34 preservatives were investigated. The adsorbent comprising functional ionic liquid 1-vinyl-3-octylimidazole-2-naphthalene sulfonate (VOIm⁺NapSO₃⁻) combined with Fe₃O₄@SiO₂@G adsorbent had better adsorption capacity than the other adsorbents due to the following factors: the structure of the ionic liquid with two benzene rings could produce an appropriate intensity of π–π conjugation; lower steric hindrance enabled the facile combination with preservatives; the imidazole ring and the hydroxyl groups provided the possibility of formative hydrogen bonding. The detailed chemical and microstructural features of the hybrid nanomaterials were studied via SEM, VSM, FTIR and XPS analyses. Under the optimal conditions, the satisfactory detection limits (LOD) of this method were in the range of 0.01–0.15 μg L⁻¹. This study reveals the potential of the VOIm⁺NapSO₃⁻ attached Fe₃O₄@SiO₂@G nanomaterial composite as a novel adsorbent for pretreatment applications.

中文翻译：

设计的多功能离子液体-磁性石墨烯纳米复合物作为MSPE的吸附剂，用于测定防腐剂†

用于制造四种类型的离子液体的新结构的设计是成功地适应，这是基于变化的1-乙烯基-3-辛基咪唑鎓溴化物（VOIm的阴离子⁺溴^-）与烷基苯磺酸（BenSO ₃^-），2-萘磺酸（NapSO ₃^{- ），1-}蒽醌磺酸（AQSO ₃^-）和1,2-萘醌-4-磺酸（NQSO ₃^-）。然后，将设计的离子液体直接在磁性氧化石墨烯还原的纳米颗粒（Fe ₃ O ₄ @SiO ₂@G），并用作新型磁性吸附剂，用于通过超高效液相色谱-三重四极杆/线性离子阱质谱（UPLC-MS / MS）测定蔬菜中的防腐剂。在这项研究中，研究了四种功能性离子液体-磁性石墨烯吸附剂的比吸附容量。研究了所制备的新型磁性吸附剂对34种防腐剂的吸附能力。包含功能性离子液体1-乙烯基-3-辛基咪唑-2-萘磺酸盐吸附剂（VOIm ⁺ NapSO ₃^-）为Fe组合₃ ö ₄ @SiO ₂由于以下因素，@ G吸附剂比其他吸附剂具有更好的吸附能力：具有两个苯环的离子液体的结构可以产生适当的π-π共轭强度；较低的空间位阻使它易于与防腐剂结合；咪唑环和羟基提供了形成氢键的可能性。通过SEM，VSM，FTIR和XPS分析研究了杂化纳米材料的详细化学和微观结构特征。在最佳条件下，该方法的满意检出限（LOD）在0.01–0.15μgL ^-1范围内。这项研究揭示了VOIm的潜力⁺ NapSO ₃^-连接铁₃O ₄ @SiO ₂ @G纳米材料复合材料是用于预处理应用的新型吸附剂。

更新日期：2018-02-12

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