Highly fluorinated magnetic covalent organic framework for efficient adsorption and sensitive detection of microcystin toxin in aqueous samples.
Journal of chromatography. A(2022)
摘要
The effective adsorption and sensitive determination of microcystin-LR (MC-LR) are crucial for the environment and human health. In this work, a highly fluorinated magnetic covalent organic framework (denoted as Fe3O4@TabTfa-F4) was synthesized through a simple strategy. The morphology and structure of the as-prepared Fe3O4@TabTfa-F4 were investigated and Fe3O4@TabTfa-F4 showed that it had a high specific surface area (442.3 m² g-1), high fluorine content (6.0%), large pore volume (0.255 cm³ g-1), and strong magnetic responses (31.0 emu g-1). The new sorbent Fe3O4@TabTfa-F4 was applied for MC-LR adsorption. The adsorption behavior was investigated, and the results followed pseudo-second-order kinetics and the Langmuir adsorption model. The excellent adsorption capacities for MC-LR (Qmax = 495.1 mg g-1) may be due to the formation of numerous hydrogen bonds, hydrophobic interaction, and π-π stacking interaction between MC-LR and Fe3O4@TabTfa-F4. Afterward, Fe3O4@TabTfa-F4 was used to extract MC-LR from aqueous samples, followed by high-performance liquid chromatography incorporated with UV spectroscopy. The major parameters that influenced the extraction performance were investigated. The developed method exhibited good linearity in the range of 0.25-20 ng L-1. Under the optimum conditions, limits of detection (S/N=3), limits of quantitation (S/N=10), enrichment factor and relative standard deviation were calculated to be 0.041 ng mL-1, 0.13 ng mL-1, 425, and 9.6%, respectively. The spiked recoveries ranged within 75.3%-108.6%. These findings indicate that Fe3O4@TabTfa-F4 has potential application to the adsorption and sensitive detection of MC-LR from aqueous samples.
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