Sensitive bisphenol determination of environmental water by high-performance liquid chromatography (HPLC) using magnetic sulfo-functionalized metal-organic frameworks nanocomposites as the adsorbent

A rapid, simple, and precise simultaneous determination method for four kinds of bisphenols (BPs) in environmental water was developed based on high-performance liquid chromatography (HPLC) technology. Water samples were first extracted using the prepared magnetic polydopamine sulfonic acid group-zirconium metal-organic framework (Fe3O4@PDA@Zr-SO3H-MOF) nanocomposites using the magnetic solid-phase exaction (MSPE) technique. Adsorption tests showed that the prepared material possessed superior hydrophilicity and ultrahigh surface area, as well as strong magnetic responsiveness. When used as an MSPE sorbent for four bisphenols, Fe3O4@PDA@Zr-SO3H-MOF displayed good performance in terms of extraction efficiencies, enrichment factors, and reusability. Linear relationships with a correlation coefficient greater than 0.998 and relative standard deviations of 3.8-5.1% were as achieved for BP concentrations within the range of 0.05-200 mu g L-1. The detection limits and quantification limits were between 0.0048-0.0073 mu g L-1 and 0.016-0.024 mu g L-1, respectively. Overall, this method was successfully applied to determine BPs in practical water samples with recoveries between 93.1-105.8%. Magnetic sulfo-functionalized MOF nanocomposites (Fe3O4@PDA@Zr-SO3H-MOF) were synthesized as an adsorbent, and showed several advantages, such as high adsorption capacity, super-hydrophilicity, good extraction and fast separation ability for BPs.