Graphene oxide reinforced ionic liquid-functionalized adsorbent for solid-phase extraction of phenolic acids
Abstract An environmental friendly sorbent of polymeric ionic liquids modified graphene oxide-grafted silica (PILs@GO@Sil) was synthesized for solid-phase extraction (SPE) of phenolic acids. The sorbent was prepared via a chemical layer-to-layer fabrication including amidation reaction, surface radical chain-transfer polymerization and in situ anion exchange. After modification with PILs, the silica surface had higher positive potential so that it would exhibit stronger electrostatic interaction for acidic compounds compared with GO@Sil. The adsorption performance of phenolic acids was investigated through the theoretical calculation and static, kinetic state adsorption experiments. Under the optimized conditions, wide linear ranges were obtained with correlation coefficients ranging from 0.9912 to 0.9998, and limits of detection were in the range of 0.20–0.50 μ gL −1 . Compared with other reported methods, the proposed PILs@GO@Sil-SPE-HPLC showed higher extraction efficiency. Finally, the black wolfberry yogurt and urine were analyzed as real samples and good recoveries spiked with standard solution were obtained. Highlights PF 6 − -based PIL was modified onto the GO-grafted silica as a SPE medium. The adsorption performance was investigated by the theoretical calculation and the static, dynamic-state adsorption experiments. The modification of PILs affected the surface property of GO. The proposed method exhibited excellent extraction recoveries for phenolic acids in real samples.
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