基于凹凸棒/四氧化三铁的磁性分子印迹聚合物的制备及其对咖啡因的吸附性能  

The preparation and property of magnetic molecularly imprinted polymer based on attapulgite/Fe_3O_4

作　　者：杨武[1] 卢秀[1] 郭昊[1] 薛瑞[1] 郭婧[1] YANG Wu LU Xiu GUO Hao XUE Rui GUO Jing(Key Laboratory of Eco-Environment-Related Polymer Materials of Ministry of Education, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou 730070, Gansu, Chin)

机构地区：[1]西北师范大学化学化工学院,生态环境相关高分子材料教育部重点实验室,甘肃兰州730070

出　　处：《西北师范大学学报（自然科学版）》2017年第2期57-64,共8页Journal of Northwest Normal University(Natural Science)

基　　金：国家自然科学基金资助项目(21665024,20873101)

摘　　要：使用共沉淀法,以咖啡因作为模板分子,凹凸棒/四氧化三铁(ATP/Fe_3O_4)为聚合物内核,丙烯酰胺为功能单体,乙二醇二甲基丙烯酸酯为交联剂,在偶氮异二丁腈引发下成功制备了具有核壳结构的磁性分子印迹聚合物(MMIPs),该聚合物能够选择性识别并吸附咖啡因.通过红外(FT-IR)、扫描电镜(SEM)、热重分析(TGA)和X-射线衍射(XRD)等手段对制备的聚合物的形貌和结构进行了表征,研究了聚合物的吸附性能.结果表明,室温下MMIPs对咖啡因的饱和吸附量为2.94mg·g^(-1),吸附过程符合Langmuir等温吸附模型和准二级动力学吸附模型,该印迹聚合物对咖啡因具有较高的亲和性、选择性和重复利用性.Magnetic molecularly imprinted polymer （MMIPs recognizing cafeine is prepared by a co-precipitation method ） with core-shell structure for selectively using ATP/Fe304 as cores, acrylamide as functional monomer, ethylene dimethacrylate as linkage agent and azo-iso-butyronitrile as initiator. The prepared polymer is characterized by Fourier-transform infrared spectrometer（FT-IR）, scanning electron microscope（SEM）, thermogravimetric analysis （TGA） and X-ray diffraction （XRD）. The results show that the adsorption capacity of MMIPs for caffeine reaches 2.94 mg·g^-1 at 298 K, and the adsorption process obeys the Langmuir isotherm model and the pseudo-second-order kinetic equation. The polymer has high affinity and selectivity towards caffeine, and good regeneration as well.

关 键 词：咖啡因 磁性分子印迹聚合物 核壳结构 吸附 

分 类 号：O647.33[理学—物理化学] TB333[理学—化学]