表面印迹法制备钴(Ⅱ)离子印迹硅胶及性能

采用表面印迹技术, 以Co(Ⅱ)离子作为印迹离子, 二乙烯三胺基丙基三甲氧基硅烷为功能分子, 硅胶为支撑物, 环氧氯丙烷为交联剂, 在硅胶表面制备Co(Ⅱ)离子印迹硅胶材料, 利用红外光谱仪、扫描电镜和热重分析仪等进行了表征, 采用平衡吸附法研究了印迹硅胶材料的吸附性能和选择识别能力. 结果表明, 印迹硅胶材料和非印迹硅胶材料的最大吸附量分别为35.2和6.5 mg/g; 印迹硅胶材料对Co(Ⅱ)离子的吸附行为符合Langmuir模型; 20 min即可达到吸附平衡; 当pH=3.9~7.8时, 印迹硅胶材料保持了较好的吸附容量; 印迹硅胶材料对Co(Ⅱ)离子具有较强的选择性识别能力; 重复使用时性能稳定.

Preparation of Cobalt( Ⅱ ) Ion Imprinted Silica Gel Sorbents by Surface Imprinting Technique and Its Adsorption Properties

A Co(Ⅱ) ion imprinted silica gel sorbent was prepared by surface imprinting technique using Co(Ⅱ) as the template, 3-2-(2-aminoethylamino)ethylamino]propyl-trimethoxysilane as the functional monomer, silica gel as the support, and epichlorohydrin as the crosslinking agent, and was characterized by Fourier transform infrared(FTIR) spectra, scanning electron microscopy(SEM) and thermogravimetric analysis-differential thermal analysis(TG-DTA). The adsorption property and selective recognition ability of Co(Ⅱ) ion imprinted silica gel sorbent were studied by equilibrium\|adsorption method. The results showed that the maximum static adsorption capacity of ion imprinted and non-imprinted silica gel sorbent were 35.2 and 6.5 mg/g, respectively. The experimental data followed the Langmuir adsorption model. The adsorption equilibrium could be reached in 20 min. There was no influence of pH values on adsorption capacity of ion imprinted silica gel sorbent in the range of 3.9—7.8. Co(Ⅱ) ion imprinted silica gel sorbent could be used repeatedly and indicated high selectivitys even in the presence of the other metal ions.