School of Chemical Engineering, Sichuan University of Science & Engineering, 180 Xuyuan Street, Huixing Road, Zigong, 643000, China.
Environ Sci Pollut Res Int. 2024 May;31(21):30484-30496. doi: 10.1007/s11356-024-33249-2. Epub 2024 Apr 12.
In this paper, the objective is to immobilize molecularly imprinted polymers (MIPs) onto the surface of magnetic carbon nanoparticles (FeO@SiO@C) to develop an effective method for the adsorption of zearalenone (ZEN). The prepared products were characterized by FT-IR, SEM, TEM, XRD, VSM, TGA, and BET. The content of zearalenone in corn samples was monitored by HPLC. The results indicate that the particle size of magnetic molecularly imprinted polymers (MMIPs) is approximately 200 nm. The adsorption mechanism of MMIPs was confirmed by static adsorption and dynamic adsorption experiments. The maximum adsorption capacity was 1.56 mg/g, and the adsorption equilibrium was reached within 50 min. The scatchard model showed that MMIPs had two binding sites, a high-affinity binding site and a low-affinity site. Kinetic second-order fitting indicates that MMIPs are mainly through chemisorption. In the actual sample application, the limit of detection (LOD) and limit of quantitation (LOQ) were 0.3 mg/L and 0.9 mg/L, respectively. The recovery of corn with the standard addition of ZEN was 73.6-88.1%, and the relative standard deviation (RSD) was 2.86-5.63%. The results demonstrated that MMIPs possess the advantages of straightforward operation, high precision, and cost-effectiveness, rendering them suitable for rapid ZEN detection.
本文旨在将分子印迹聚合物（MIPs）固定在磁性碳纳米粒子（FeO@SiO@C）的表面，开发一种用于吸附玉米赤霉烯酮（ZEN）的有效方法。采用傅里叶变换红外光谱（FT-IR）、扫描电子显微镜（SEM）、透射电子显微镜（TEM）、X 射线衍射（XRD）、振动样品磁强计（VSM）、热重分析（TGA）和比表面积与孔隙度分析仪（BET）对制备的产物进行了表征。采用高效液相色谱法（HPLC）监测玉米样品中玉米赤霉烯酮的含量。结果表明，磁性分子印迹聚合物（MMIPs）的粒径约为 200nm。通过静态吸附和动态吸附实验证实了 MMIPs 的吸附机理。最大吸附容量为 1.56mg/g，吸附平衡在 50min 内达到。Scatchard 模型表明 MMIPs 具有两个结合位点，即高亲和力结合位点和低亲和力结合位点。动力学二级拟合表明 MMIPs 主要通过化学吸附。在实际样品应用中，检测限（LOD）和定量限（LOQ）分别为 0.3mg/L 和 0.9mg/L。用 ZEN 标准物质对玉米进行加标回收实验，回收率为 73.6%-88.1%，相对标准偏差（RSD）为 2.86%-5.63%。结果表明，MMIPs 具有操作简单、精度高、成本效益好等优点，适合快速检测玉米赤霉烯酮。
