Herein, a graphene-based metal and nitrogen-doped carbon (GNC-Co) composite, derived from zeolite imidazolate framework-67 (ZIF-67)–graphene oxide composites, was successfully developed and applied as an excellent fiber coating for solid phase microextraction (SPME) with enhanced performance. The fabricated carbon has a hierarchically micro/mesoporous structure with a high specific surface area of 123 m² g⁻¹. The study found that pyrolytic graphene (G) has good adsorption properties for anthracene, phenanthrene, fluoranthene and pyrene, while pyrolytic ZIF-67 (NC-Co) has good adsorption properties for naphthalene, acenaphthylene, acenaphthylene and fluorene. Combined with the advantage of G and NC-Co, the synthesized composite GNC-Co enabled the integration of the unique properties of these two fascinating materials and proved to show better performance in the extraction of all polycyclic aromatic hydrocarbons (PAHs). Compared to the commercial PDMS fiber, the self-made fiber achieved GC responses about 2–9 times as high as those obtained by the commercial 30 μm PDMS fiber. Furthermore, the self-made fiber obtained low detection limits in the range of 0.01–0.74 ng L⁻¹ and wide linearity under the optimized extraction conditions. Finally, the GNC-Co coated fiber was successfully used for the detection of PAHs in real river water samples, which proved the applicability of the method.

中文翻译：

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石墨烯基金属和氮掺杂的碳复合材料作为吸附剂，用于高灵敏度固相微萃取多环芳烃†

在此，成功开发了由咪唑类骨架67（ZIF-67）-氧化石墨烯复合材料衍生的石墨烯基金属和氮掺杂碳（GNC-Co）复合材料，并将其用作固相微萃取的优良纤维涂层（SPME）具有增强的性能。所制造的碳具有分级的微/介孔结构，其高比表面积为123 m ² g ^-1。研究发现，热解石墨烯（G）对蒽，菲，荧蒽和pyr具有良好的吸附性能，而热解ZIF-67（NC-Co）对萘，、,和芴具有良好的吸附性能。结合G和NC-Co的优势，合成的GNC-Co复合材料能够整合这两种引人入胜的材料的独特性能，并被证明在所有多环芳烃（PAHs）的萃取中表现出更好的性能。与商用PDMS光纤相比，自制光纤实现的GC响应约为商用30μmPDMS光纤获得的GC响应的2–9倍。此外，自制纤维在0.01–0.74 ng L ^-1的范围内获得了较低的检测限在优化的萃取条件下具有宽线性度。最终，GNC-Co涂层纤维被成功用于实际河水样品中多环芳烃的检测，证明了该方法的适用性。