a novel mof/cof hybrid as fiber coating for hs-spme sampling of polycyclic aromatic hydrocarbons from environmental samples

Porous materials have intrigued a great deal of research interest in recent years due to their unique properties and widespread applications. in particular, so called advanced porous materials (apms) [1] such as metal-organic frameworks (mofs) [2,3], covalent organic frameworks (cofs) [4,5], polymers of intrinsic microporosity (pims), hypercrosslinked polymers (hcps), porous aromatic frameworks (pafs), and conjugated microporous polymers (cmps) have been widely investigated in many fields of science and technology. among them, cofs and mofs have received increasing attention in various technological and scientific fields owing to the capability to control their pore size, shape, and chemical functionalities [6,7]. herein, a novel cu-mof/cof hybrid was prepared and applied as a sorbent for headspace solid-phase microextraction sampling of polycyclic aromatic hydrocarbons (pahs) in solid samples. the thermal behavior, morphology, and structure of the cu-mof/cof hybrid were characterized using thermogravimetric analysis (tga), scanning electron microscopy (sem), x-ray diffraction (xrd), and fourier transform infrared spectroscopy (ft-ir). the influential experimental parameters were investigated and optimized using a box-behnken design (bbd). the developed method showed low limits of detection (0.005-0.02 ng g-1), and good linearities (0.1-1000 ng g-1) for the pahs. the calculated standard deviations were 3.7-11.4% (n = 6). the proposed sorbent was successfully applied for the analysis of pahs in contaminated soil samples.