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首页> 外文期刊>Analytical chemistry >In Situ Hydrothermal Growth of Metal-Organic Framework 199 Films on Stainless Steel Fibers for Solid-Phase Microextraction of Gaseous Benzene Homologues
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In Situ Hydrothermal Growth of Metal-Organic Framework 199 Films on Stainless Steel Fibers for Solid-Phase Microextraction of Gaseous Benzene Homologues

机译：用于气态苯同系物固相微萃取的不锈钢纤维上金属有机骨架199膜的原位水热生长

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摘要

Metal-organic frameworks (MOFs) have received great attention due to their fascinating structures and intriguing potential applications in various fields. Herein, we report the first example of the utilization of MOFs for solid-phase microextraction (SPME). MOF-199 with unique pores and open metal sites (Lewis acid sites) was employed as the coating for SPME fiber to extract volatile and harmful benzene homologues. The SPME fiber was fabricated by in situ hydrothermal growth of thin MOF-199 films on etched stainless steel wire. The MOF-199-coated fiber not only offered large enhancement factors from 19 613 (benzene) to 110 860 (p-xylene), but also exhibited wide linearity with 3 orders of magnitude for the tested benzene homologues. The limits of detection for the benzene homologues were 8.3-23.3 ng L~(-1). The relative standard deviation (RSD) for six replicate extractions using one SPME fiber ranged from 2.0percent to 7.7percent. The fiber-to-fiber reproducibility for three parallel prepared fibers was 3.5percent-9.4percent (RSD). Indoor air samples were analyzed for the benzene homologues using the SPME with the MOF-199-coated fiber in combination with gas chromatography-flame ionization detection. The recoveries for the spiked benzene homologues in the collected indoor air samples were in the range of 87percent-106percent. The high affinity of the MOF-199-coated fiber to benzene homologues resulted from the combined effects of the large surface area and the unique porous structure of the MOF-199, the pi-pi interactions of the aromatic rings of the analytes with the framework 1,3,5-benzenetricarboxylic acid molecules, and the pi-complexation of the electron-rich analytes to the Lewis acid sites in the pores of MOF-199.
机译：金属有机框架（MOF）由于其引人入胜的结构以及在各个领域的潜在应用而备受关注。在本文中，我们报告了MOF用于固相微萃取（SPME）的第一个示例。具有独特孔和开放金属位点（路易斯酸位点）的MOF-199被用作SPME纤维的涂层，以提取挥发性和有害的苯同系物。 SPME纤维是通过在腐蚀的不锈钢丝上原位水热生长MOF-199薄膜制成的。涂有MOF-199的纤维不仅提供了从19 613（苯）到110 860（对二甲苯）的大增强因子，而且对于测试的苯同系物还表现出了3个数量级的宽线性。苯同系物的检出限为8.3〜23.3 ng L〜（-1）。使用一根SPME纤维进行六次重复萃取的相对标准偏差（RSD）为2.0％至7.7％。三种平行制备的纤维之间的纤维重现性为3.5％-9.4％（RSD）。使用SPME和MOF-199涂层纤维，结合气相色谱-火焰电离检测技术，分析室内空气样品中的苯同系物。收集的室内空气样品中加标的苯同系物的回收率在87％-106％的范围内。涂覆MOF-199的纤维对苯同系物的高亲和力是由于大表面积和MOF-199独特的多孔结构，分析物的芳环与骨架的pi-pi相互作用共同作用的结果1,3,5-苯三羧酸分子，以及富电子分析物的pi络合物与MOF-199孔中的Lewis酸位。

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