A new ionic liquid-magnetic graphene (IL-MG) composite was used as the adsorbent in magnetic dispersive solid-phase extraction to rapidly extract and isolate triazine herbicides from surface water. IL-MG was synthesized by a simple and time-saving one-pot strategy where the synthesis of magnetic Fe₃O₄, the modification with an IL, and the reduction of graphene oxide to graphene were conducted at the same time. An IL was applied to enrich the interaction mechanism between IL-MG and analytes (π–π, hydrophobic interaction, and electrostatic interaction). Moreover, the IL and Fe₃O₄ nanoparticles acted as spacers, inserting between the layers of graphene to prevent the aggregation of graphene, which improved the adsorption ability because of the large specific surface area of IL-MG. The resultant IL-MG had hierarchical flake structures and showed a high adsorption capacity (8266.0–12 324.1 μg g⁻¹) toward triazine herbicides. Under suitable conditions, the linearity for triazine herbicides was achieved in the range of 0.55–500 ng mL⁻¹ with a detection limit of 0.09–0.15 ng mL⁻¹ and a quantitation limit of 0.31–0.51 ng mL⁻¹, and the enrichment factor was 83-fold, which indicated that the proposed method could be successfully applied for the determination of triazine herbicides in surface water.

中文翻译：

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离子液-磁石墨烯复合材料用于电磁分散固相萃取地表水中的三嗪类除草剂，然后进行高效液相色谱分析

一种新型的离子液体-电磁石墨烯（IL-MG）复合物被用作磁性分散固相萃取中的吸附剂，以从地表水中快速萃取和分离三嗪类除草剂。IL-MG是通过简单且省时的一锅法合成的，该方法同时进行磁性Fe ₃ O ₄的合成，IL的修饰以及氧化石墨烯向石墨烯的还原。IL被用于丰富IL-MG与分析物之间的相互作用机理（π-π，疏水相互作用和静电相互作用）。此外，IL和Fe ₃ O ₄纳米粒子充当间隔物，插入在石墨烯层之间以防止石墨烯聚集，这是由于IL-MG的大比表面积而提高了吸附能力。生成的IL-MG具有分层的片状结构，对三嗪类除草剂显示出高吸附能力（8266.0-12 324.1μgg ^-1）。在合适的条件下，三嗪类除草剂的线性范围为0.55–500 ng mL ^-1，检出限为0.09–0.15 ng mL ^-1，定量限为0.31–0.51 ng mL ^-1，并且富集该因子为83倍，表明该方法可成功用于地表水中三嗪类除草剂的测定。