苏丹红Ⅰ分子印迹聚合物制备及吸附性能研究

摘要

Molecularly imprinted polymer（MIP） was prepared by precipitated polymerization in chloroform with α-methacrylic acid as the functional monomer,ethylene glycol methyl acrylate as the cross-linkers,azobisisobutyronitrile as the initiator，SudanⅠ as the template molecule.The results of equilibrium binding experiment indicated that，when the molar ratio of SudanⅠ:functional monomer:crossing-linker was 1:4:16,the polymer attained the maximum adsorption of SudanⅠ,the amount of rnsolvent and initiator used in preparation had great influence on binding performance.The equilibrium adsorption amounts of MIP and NIP adsorbing SudanⅠ were 49.17 μmol·g-1 and 22.6 μmol·g-1,respectively.The amounts of SudanⅠ and Sudan Ⅲ adsorbed by MIP in selective binding experiments were 26.8 μmol·g-1 and 5.26 μmol·g-1,respectively.It indicated that the MIP rnpossessed the specific adsorption of SudanⅠ.Scatchard analysis showed that two classes of binding sites were formed in the molecularly imprinted polymer.%以苏丹红Ⅰ为模板分子,α-甲基丙烯酸为功能单体,乙二醇二甲基丙烯酸酯为交联剂,偶氮二异丁腈为引发剂,在氯仿中采用沉淀聚合法制备了分子印迹聚合物.聚合物的平衡结合试验表明:模板分子/功能单体/交联剂的摩尔比为1:4:16时所得的印迹聚合物对苏丹红Ⅰ吸附量最大;合成时溶剂和引发剂用量对聚合物吸附量有很大影响;印迹和非印迹聚合物对苏丹红Ⅰ的平衡吸附量分别为49.17μmol·g-1和22.6μmol·g-1,选择性结合试验中印迹聚合物对苏丹红Ⅰ和苏丹红Ⅲ的吸附量分别为26.8μmol·g-1和5.26μmol·g-1,说明印迹聚合物对苏丹红Ⅰ具有特异性吸附;Scatchard分析表明该印迹聚合物具有两类结合位点.