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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+ imprinted magnetic chitosan microspheres (MIPs) were prepared by metal ion imprinting technique using magnetic Fe3O4 as magnetic core, Cu2 + as template ion and chitosan as functional monomer. The optimum conditions for the preparation of MIPs were determined by examining the amount of chitosan, Fe 3 O 4 and the cross-linking agent. MIPs were characterized by scanning electron microscopy (SEM), vibrating sample magnetometer (VSM) and Fourier transform infrared spectroscopy (FTIR). The results show that the Cu2 + magnetic imprinted magnetic chitosan microspheres have a three-dimensional network structure with a saturation magnetization of 0.39 A · m-1. The adsorption of Cu 2+ by MIPs was studied by static adsorption method. The results of adsorption isotherm showed that the adsorption of Cu 2+ by MIPs conformed to Langmuir equation and was adsorbed by monolayer. The selective recognition properties of MIPs in multivariate mixed solution of Cu 2+, Zn 2+, Co 2+ and Ni 2+ were studied. The results showed that MIPs Cu2 +, Cu2 +, Ni2 +, Cu2 +, Cu2 +, Zn2 +, Cu2 +, Cu2 + The selective adsorption coefficients (K) of / Co ~ (2+) were 40.13, 71.21 and 128.13 respectively. MIPs Regeneration - No Significant Decrease in Adsorption Capacity After 10 Reuse.