Cu^(2+)印迹磁性壳聚糖微球的制备及选择性识别特性  

Synthesis of Cu^(2+) Ion-Imprinted Magnetic Chitosan Beads for Selective Recognition of Cu^(2+) Ion in Aqueous Solution

作　　者：马立成[1] 郑其[1] 车小奎[1] 冯海亮[1] 严波[1] 

机构地区：[1]北京有色金属研究总院稀有金属冶金材料研究所,北京100088

出　　处：《稀有金属》2016年第6期606-612,共7页Chinese Journal of Rare Metals

基　　金：国家高技术研究发展计划(863计划)项目(2013AA065703)资助

摘　　要：通过金属离子印迹技术,以磁性Fe3O_4为磁核,Cu^(2+)为模板离子,壳聚糖为功能单体,制备了Cu^(2+)印迹磁性壳聚糖微球(MIPs)。通过考察壳聚糖、Fe_3O_4以及交联剂的用量确定了制备MIPs的最佳工艺条件。并采用扫描电镜(SEM),振动样品磁强计(VSM)和傅里叶变换红外光谱仪(FTIR)对MIPs进行了表征。结果表明:Cu^(2+)印迹磁性壳聚糖微球具有三维网状的多孔结构,其饱和磁化强度为0.39 A·m-1。通过静态吸附法研究了MIPs对Cu^(2+)的吸附特性。吸附等温研究结果表明,MIPs对Cu^(2+)的吸附符合Langmuir方程,为单分子层吸附。通过MIPs在Cu^(2+),Zn^(2+),Co^(2+)和Ni^(2+)的多元混合溶液中的吸附研究了其选择性识别特性,结果表明:MIPs对Cu^(2+)有较高的选择性识别性能,对Cu^(2+)/Zn^(2+),Cu^(2+)/Ni^(2+),Cu^(2+)/Co^(2+)的选择吸附系数(K)分别为40.13,71.21,128.13。MIPs再生-重复使用10次吸附容量没有明显降低。The Cu^2＋ ion-imprinted magnetic chitosan beads （MIPs） were prepared by ehitosan, using Fe3O4 as magnetic core, Cu^2＋ ion as template, and chitosan as functional monomers. The optimum preparation conditions were confirmed by investigating the dosage of chitosan, Fe3O4 and cross-linker. The MIPs were characterized by scanning electron microscope （SEM） , Fourier transformation infrared （FTIR） spectroscope and vibrating sample magnetometer （VSM）. The results showed that the Cu^2＋ ion imprinted magnetic chitosan beads had a 3-dimension network structure. The magnetic properties were measured by vibrating sample magnetometer and the saturation magnetization was 0.39 A·m^-1. The adsorption of Cu2 ＋ ion on MIPs was investigated by static adsorption method. The adsorption isotherm study showed that the Langmuir isotherm equation was best fitted for the monolayer adsorption processes. The MIPs were used for selectivity adsorption of Cu^2＋ , Zn^2＋ , Co^2＋ and Ni^＋ ions in an aqueous solution. The results showed a high selectivity toward Cu^2＋ ion in the mixture solution, the selectivity coefficients （K） of MIPs for Cu^2＋/Zn^2＋, Cu^2＋/Ni^2＋ and Cu^2＋/Co^2＋ were 40. 13, 71.21 and 128.13, respectively. Furthermore, the MIPs could be regenerated and reused for 10 times without a significant decrease in adsorption capacity.

关 键 词：印迹 磁性 壳聚糖 吸附 选择性识别 

分 类 号：TQ321.2[化学工程—合成树脂塑料工业]