基于氨基化二氧化硅微球表面印迹聚合物高效去除水中氯霉素的研究

Study on the efficient removal of chloramphenicol from water based on surface-imprinted polymer on aminated silica microspheres

目的 制备可特异性识别氯霉素(chloramphenicol,CAP)的吸附剂,并对实际水样中的氯霉素进行快速吸附去除。方法 基于表面分子印迹技术(surface molecularly imprinting technique, SMIT),以氨基化二氧化硅(SiO;-NH;)微球为载体,α-甲基丙烯酸(α-methacrylic acid,α-MAA)为功能单体,乙二醇二甲基丙烯酸酯(ethylene glycol dimethacrylate, EGDMA)为交联剂制备核壳结构的氯霉素分子印迹聚合物微球。采用计算机模拟分析氯霉素与功能单体之间的相互作用筛选合适的单体,确定模板分子和功能单体的比例,并考查吸附剂的形貌特征、吸附性能和稳定性。结果 模板分子和功能单体的比例为1:4,制备的吸附剂SiO;-NH;@MIP吸附容量为65.36mg/g,吸附行为符合Langmuir吸附等温线模型和准二级动力学模型,为单层化学吸附。经过5次吸附循环后,对CAP的去除率仍在94%以上。结论 本研究制备的聚合物吸附去除氯霉素效果好、成本低、可重复利用,在水净化方面具有良好的应用前景。

Objective To prepare an adsorbent that can specifically recognize chloramphenicol(CAP) and rapidly remove chloramphenicol from real water samples. Methods In this study, chloramphenicol(CAP)molecularly imprinted polymer microspheres with core-shell structure were prepared by surface molecularly imprinting technique(SMIT) using amino silica(SiO;-NH;) microspheres as carrier, α-methacrylic acid(α-MAA) as the functional monomer and ethylene glycol dimethacrylate(EGDMA) as the cross-linking agent. The computer simulation was used to analyze the interaction between chloramphenicol and functional monomers to screen suitable monomer, and determine the ratio of template molecule and functional monomer, the morphology, adsorption properties and stability of the adsorbent were investigated. Results The ratio of template molecule and functional monomer were finally determined to be 1:4, the adsorption capacity of the prepared adsorbent SiO;-NH;@MIP was 65.36 mg/g, and the adsorption behavior conformed to the Langmuir adsorption isotherm model and pseudo-second-order kinetic model, indicating that it was monolayer chemisorption. After 5 adsorption cycles, the removal rate of CAP was still above 94%. Conclusion The prepared polymer has good adsorption effect on chloramphenicol, low cost and reusability, and has a good application prospect in water treatment.