Synthesis of the Magnetically Nanoporous Organic Polymer Fe3O4@SiO2-NH2-COP and Its Application in the Determination of Sulfonamide Residues in Surface Water Surrounding a Cattle Farm

Yuqin Yang; Junjie Miao; Zhendong Yin; Weili Hao; Hongmei Shi; Ling Ma; Tiesheng Shi

doi:10.1155/2022/6453609

Synthesis of the Magnetically Nanoporous Organic Polymer Fe₃O₄@SiO₂-NH₂-COP and Its Application in the Determination of Sulfonamide Residues in Surface Water Surrounding a Cattle Farm

Bioinorg Chem Appl. 2022 Apr 23:2022:6453609. doi: 10.1155/2022/6453609. eCollection 2022.

Authors

Yuqin Yang¹, Junjie Miao¹, Zhendong Yin¹, Weili Hao¹, Hongmei Shi¹, Ling Ma^{1

2}, Tiesheng Shi³

Affiliations

¹ Hebei Key Laboratory of Environment and Human Health, School of Public Health, Hebei Medical University, Shijiazhuang 050017, Hebei, China.
² Chemical Laboratory, Shijiazhuang Center for Disease Control and Prevention, Shijiazhuang 050011, Hebei, China.
³ College of Chemistry, Chemical Engineering and Materials Science, Zaozhuang University, Zaozhuang 277160, Shandong, China.

Abstract

Efficient extractions of trace antibiotic residues in the environment are a key factor for accurate quantification of the residues. A new nanoporous material, namely, magnetically covalent organic polymer (MCOP, Fe₃O₄@SiO₂-NH₂-COP) was synthesized in this work and was used for magnetic solid-phase extraction (MSPE). The combination of MSPE with high-performance liquid chromatography separation together with ultraviolet detection (HPLC-UV) was established as an effective method for the determination of four sulfonamide (SA) residues in surface water surrounding a cattle farm. The synthesized magnetic material was characterized by SEM, TEM, FT-IR, magnetic properties measurement system (MPMS), and nitrogen gas porosimetry. The material possessed many attractive features, such as a unique microporous structure, a larger specific surface area (137.93 m²·g^-1) than bare Fe₃O₄ (24.84 m²·g^-1), high saturation magnetization (50.5 emu·g^-1), open adsorption sites, and high stability. The influencing parameters, including pH, the used amount of MCOPs, the type of eluent, adsorption solution, and desorption time, were optimized. Under the optimized conditions, the method conferred good linearity ranges (R ² ≥ 0.9990), low detection limits (S/N = 3, LOD, 0.10-0.25 μg·L^-1), and satisfactory recoveries (79.7% to 92.2%). The enrichment factor (EF) for the four SAs was 34.13-38.86. The relative standard deviations of intraday (n = 5) and of interday (n = 3) were less than 4.8% and 8.9%, respectively. The equilibria between extraction and desorption for SAs could be reached within 150 s. The proposed method was sensitive and convenient for detecting SA residues in complex environmental matrices, and the successful application of the new MCOPs as an adsorbent was demonstrated.