A metal–organic framework-derived nanoporous carbon/iron composite for enrichment of endocrine disrupting compounds from fruit juices and milk samples

Abstract

In this work, a nanoporous carbon/iron composite material designated as MIL-53-C was fabricated by one-step carbonization of an Fe-based metal–organic framework material MIL-53. The obtained MIL-53-C showed a high Brunauer–Emmett–Teller surface area (249.33 m² g⁻¹), large pore volume (0.57 cm³ g⁻¹) and an excellent magnetic property (127.95 emu g⁻¹). It was used as a magnetic solid-phase extraction adsorbent for the enrichment of some endocrine disrupting compounds from fruit juice and milk samples followed by high-performance liquid chromatographic analysis. Under optimum conditions, a good linearity for all analytes over the studied concentration range was achieved with a correlation coefficient higher than 0.9995. The limits of detection, based on S/N = 3, were 0.05–0.10 ng mL⁻¹ for fruit juice and 0.10–0.20 ng mL⁻¹ for milk samples. The recoveries of spiked samples ranged from 92.2% to 108.3%. These results indicated that the MIL-53-C exhibited an excellent adsorption capability for trace levels of EDCs, and it may also be a promising adsorbent for extraction and enrichment of other organic pollutants.