Polycyclic aromatic hydrocarbons (PAHs) are a class of persistent organic pollutants with strong carcinogenicity and mutagenicity, which cause great harm to the environment and food. Herein, a composite (NH₂-MIL-88@PCN-224) was prepared through a guest PCN-224 in situ grown on the host NH₂-MIL-88 by a surfactant-assisted growth strategy, and successfully applied for solid-phase microextraction (SPME) of PAHs from milk samples. The prepared SPME coatings exhibited high extraction and adsorption capacity for PAHs due to their porous structure, ultra-large specific surface area, strong π-π stacking, hydrophobic interactions and size-matching effects. The SPME-GC-FID method based on NH₂-MIL-88@PCN-224 coated fibers has the significant advantages of wide linear range (1-200 ng mL^-1), low detection limit (0.003-0.020 ng mL^-1), high recoveries (92.15-106.64%) and good reproducibility. This work overcomes the lattice-matching limitation by adopting a surfactant-assisted growth strategy, which offers a new direction for the preparation of ultra-high-performance SPME coatings with extremely high extraction efficiency, exceptional thermal stability, and long service life, and greatly expands the variety of MOF SPME coatings.

中文翻译：

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利用表面活性剂辅助生长策略制备多环芳烃SPME复合材料


多环芳烃 （PAHs） 是一类持久性有机污染物，具有很强的致癌性和致突变性，对环境和食品造成极大的危害。在此，通过表面活性剂辅助生长策略在宿主 NH 2-MIL-88 上原位生长的客体 PCN-224 制备了复合材料 （NH_{2-MIL-88@PCN-224}），并成功应用于牛奶样品中 PAH 的固相微萃取 （SPME）。由于其多孔结构、超大比表面积、强π-π堆积、疏水相互作用和尺寸匹配效应，制备的 SPME 涂层表现出对 PAHs 的高萃取和吸附能力。基于 NH 2-MIL-88@PCN-224 包被纤维的 SPME-GC-FID 方法具有线性范围宽 （1-200ngmL-1）、低检出限 （0.003-0.020ngmL-1）、高回收率 （92.15-106.64%） 和良好的重现性等显著优势。本工作通过采用表面活性剂辅助生长策略克服了晶格匹配的限制，为制备具有极高萃取效率、优异热稳定性和长使用寿命的超高性能 SPME 涂层提供了新的方向，并大大扩展了 MOF SPME 涂层的种类。