Metal−organic frameworks (MOFs) have received extensive attention in adsorption applications owing to their high surface area. However, some MOFs do not perform well as the extraction medium when used under aqueous conditions. The low hydrostability of MOFs limits the practical application of these materials in solid-phase microextraction (SPME). Here, the fabrication of a water resistance SPME fiber coating is introduced based on the crystal violet (CV)-modified HKUST-1 framework on copper (Cu@HKUST-1@CV). The HKUST-1 was prepared by the in situ growth method, followed by post-synthetic modification of HKUST-1 with the CV layer. The preparation of the modified HKUST-1 was characterized by FESEM, XRD, FTIR, and DFT approaches. The prepared SPME coating was successfully employed for the quantification of anthracene (AN), as a model analyte, in water samples. The limit of detection was 0.8 ng mL⁻¹. The developed method will open up a new door towards searching for promising materials in SPME applications.

Graphical abstract

中文翻译：

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结晶紫修饰的 HKUST-1 骨架具有改善的水稳定性，可作为直接固相微萃取的有效吸附剂

金属有机框架（MOFs）由于其高表面积而在吸附应用中受到广泛关注。然而，当在水性条件下使用时，一些 MOF 不能很好地用作萃取介质。MOFs 的低水稳定性限制了这些材料在固相微萃取 (SPME) 中的实际应用。本文介绍了基于结晶紫 (CV) 修饰的铜上 HKUST-1 框架 (Cu@HKUST-1@CV) 制备防水固相微萃取纤维涂层。HKUST-1 是通过原位生长方法制备的，然后用 CV 层对 HKUST-1 进行后合成修饰。通过FESEM、XRD、FTIR和DFT方法对改性HKUST-1的制备进行了表征。制备的 SPME 涂层成功地用于蒽 (AN) 的定量，作为模型分析物，在水样中。检测限为 0.8 ng mL^-1。所开发的方法将为在 SPME 应用中寻找有前景的材料打开一扇新的大门。

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