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以核桃壳为原料,利用溶剂热法制备了磁性炭微球(MCMs),结合表面印迹技术制备了基于MCMs的磁性炭微球表面分子印迹材料(MMIPs).通过FT-IR、TGA、VSM和TEM等表征手段对其理化性能进行了表征,结果表明MMIPs为球形,印迹聚合层厚度50~80 nm,具有热稳定性和磁稳定性.采用吸附实验研究了MMIPs对AMP的识别与选择性吸附性能.Langmuir等温模型能较好地描述MMIPs对AMP的吸附平衡数据,25℃时MMIPs的单分子层最大吸附容量为40.96 mg·g-1.准二级动力学模型能较好的描述MMIPs对AMP吸附动力学行为.选择性分析结果表明,MMIPs对AMP具有较好地选择识别性,并且MMIPs可以循环使用5次.结合高效液相色谱分析技术,MMIPs已成功应用于牛奶样品中痕量AMP的分离、富集和回收,AMP的回收率为92.78%.
Magnetic walled carbon microspheres (MCMs) were prepared by solvothermal method using walnut shells as raw materials, and MCMs-based molecularly imprinted materials (MMIPs) were prepared by surface-imprinting technique. FT-IR, TGA, TEM and other characterization methods were used to characterize the physico-chemical properties of the MMIPs. The results showed that the MMIPs were spherical and the thickness of the imprinted polymer layer was 50-80 nm with thermal stability and magnetic stability. The adsorptive experiments were used to study the recognition and selective adsorption of AMP on MMIPs Performance.Langmuir isothermal model can describe the adsorption equilibrium data of AMP to MMIPs well.The maximum adsorption capacity of monolayer of MMIPs at 25 ℃ is 40.96 mg · g-1.The quasi-second-order kinetic model can describe the affinity of MMIPs well AMP adsorption kinetics. Selective analysis showed that MMIPs had a good selectivity for AMP, and MMIPs could be recycled for 5 times. Combined with HPLC, MMIPs have been successfully applied to trace AMP in milk samples Of the separation, enrichment and recovery, AMP recovery rate was 92.78%.