In this study, we not only successfully synthesized magnetic nanocomposite, Fe3O4@SiO2@porphyrin, for the first time, but also verified that the appropriate amount of delocalized π-electron played important role in PAHs extraction by comparing the extraction and elution efficiency with Fe3O4@SiO2@ graphene-oxide, which possess excessively large amount of delocalized π-electron. At the same time, we used first-principles density functional theory (DFT) to calculate adsorption energy (Ead) to study the adsorption mechanism of porphyrin to PAHs and graphene-oxide to PAHs. By optimization of extraction conditions, Fe3O4@SiO2- porphyrin-MSPE-GC-MS determination method was developed, with high extraction efficiency for trace PAHs in environmental water sample. Under the optimal conditions, Fe3O4@SiO2-porphyrin showed good precision in intra-day (&lt;8.9%) and inter-day (&lt;13.0%) detection, low method detection limits (2-10 ng L-1), and wide linearity (10-10000 ng L-1). The method was applied to simultaneous analysis of 15 PAHs with acceptable recoveries, which were 71.1%-106.0% for ground water samples and 73.7%-107.1% for Yangtze River water samples, respectively.

Porphyrin-based magnetic nanocomposites for efficient extraction of polycyclic aromatic hydrocarbons from water samples

256th National Meeting (2018)

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