木犀草素配位印迹聚合物的制备及吸附性能

Preparation and Adsorption of Luteolin Complex Molecular Imprinted Polymers

摘要:

采用沉淀聚合法，结合Zn2 的配位作用，在水溶液中制备了木犀草素配位印迹聚合物(LUT-CIPs)，并考察了LUT-CIPs的吸附性能。结果表明：LUT-CIPs的最佳制备条件为模板分子(木犀草素-Zn2 ):功能单体(丙烯酰胺):交联剂(N,N?-亚甲基双丙烯酰胺)的物质的量比=1:4:30，此条件下聚合物对醇相中的木犀草素的吸附量达36.4 mg/g、对芹菜素和云香叶苷等竞争底物的选择性系数分别达到5.09和3.35；木犀草素在LUT-CIPs的吸附过程符合Freundlich等温吸附模型和准二级动力学方程；吸附液中加入的11种金属盐均可提高LUT-CIPs的吸附容量，其影响顺序为Pb(Ac)2> Ce2(SO4)3> Bi(NO3)3> Cu(Ac)2> Mg(NO3)2> Zn(Ac)2> Ba(NO3)2> MnSO4> NiSO4> ZnSO4> CdSO4，其中加入Pb(Ac)2的吸附容量为加入Zn(Ac)2的2.48倍、未加金属盐的5.20倍。

Abstract:

A series of Luteolin complex molecular imprinted polymers（LUT-CIPs）were synthesized in water with coordination of Zn（II），using luteolin as dummy template, acrylamide (AM) as monomer and N, N?- methylene diacrylamide (MBA) as cross-linker，and the adsorption ability of LUT-CIPs were also studied. The results showed that：when n(luteolin-Zn2 )∶n(AM)∶n(MBA) was 1∶4∶30, the obtained LUT-CIPs possessed the highest adsorption properties, and the adsorption capacity for luteolin from ethanol phase reached 36.4mg/g ，selectivity coefficient of luteolin for apigenin was 5.09 and for rutin was 3.35. The adsorption process of luteolin in LUT-CIPs conforms to the Freundlich isothermal adsorption model and the quasi-second-order kinetic equation. The adsorption capacity was increased when adding metal salts to solution, the influence was Pb(Ac)2> Ce2(SO4)3> Bi(NO3)3> Cu(Ac)2> Mg(NO3)2> Zn(Ac)2> Ba(NO3)2> MnSO4> NiSO4> ZnSO4> CdSO4，the adsorption of adding Pb(Ac)2 was 2.48 times that of adding Zn(Ac)2，5.20 times that of adding nothing.