Abstract
Developing a novel magnetic mesoporous carbon material with the high surface area, completely open pore system, and sufficient magnetic response for microextraction application is highly desired. In the present work, a magnetic N,S-codoped ordered mesoporous carbon (Fe-GIOMC) was synthesized via nanocasting method using 1-methyl-3-phenethyl imidazolium hydrogen sulfate, guanine, and FeCl3 as the carbon, auxiliary nitrogen, and iron source, respectively. Owing to the intrinsic hydrophobicity of carbon rods, the in-situ incorporation of N and S endows the prepared material the suitable hydrophilicity, which is highly favorable for microextraction of analytes with moderate polarities such as triazine herbicides. The material was characterized by scanning electron microscopy, elemental mapping, nitrogen adsorption–desorption isotherm, Fourier transform infrared spectrometry, Raman spectrometry, and vibrating sample magnetometry. The synthesized Fe-GIOMC was applied for ultra-trace determination of triazine herbicides with low detection limits (0.1–0.3 μg L−1), good RSDs (below 10.6 %), and wide linear ranges (0.5–100 μg L−1). Besides, a considerable re-usability of the Fe-GIOMC sorbent, more than 6 reuses without an observable decrease in the adsorption performance, was obtained. Finally, the Fe-GIOMC was successfully applied for the determination of triazine herbicides from fruit juices.
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