Metal-organic framework-1210(zirconium/cuprum) modified magnetic nanoparticles for solid phase extraction of benzophenones in soil samples

Abstract

MOF-1210(Zr/Cu) is a new heterometallic cluster-based metal-organic framework material as well as a promising solid phase extraction coating material with ordered spatial structure, permanent high porosity and large specific surface area. In this work, a novel MOF-1210(Zr/Cu) modified magnetic nanoparticles (MNPs) was successfully prepared for magnetic solid phase extraction (MSPE) of benzophenones, including 2,4-dihydroxybenzophenone (BP-1), 2-hydroxy-4-methoxybenzophenone (BP-3) and 2,2′,4,4′-tetrehydroxybenzophenone (BP-6). The MOF-1210(Zr/Cu)-MNPs were synthesized in one step by a simple solvothermal method and showed high extraction efficiency towards analytes (with enrichment factors of 91–122). The extraction mechanism studies showed that the hydrogen bond interaction and coordination interaction between MOF-1210(Zr/Cu) and BPs played important roles during the extraction process. By coupling with HPLC, the MOF-1210(Zr/Cu)-MNPs-based MSPE-HPLC method showed wide linear range (0.1–300.0 ng·mL−1), good linearity (R ≥ 0.9982), excellent reproducibility (RSD ≤ 3.60%) and remarkable sensitivity (LODs in the range of 0.01–0.02 ng·mL−1). This method was also successfully applied to the extraction and detection of benzophenones in soil samples. Good recoveries were obtained (87.6%–113.8%) with RSDs less than 11.12%, which demonstrated the practicality of the proposed method.