表面镉(Ⅱ)离子印迹聚合物的制备及其应用

Application on the preparation of the surface cadmium ion imprinted polymer

利用离子印迹技术制备了镉(II)离子印迹聚合物,并对其吸附性能进行了详细研究。以镉(II)离子为模板,以3-氨基丙基-三乙氧基硅烷为功能单体,在纳米TiO2/SiO2表面聚合形成镉(II)印迹聚合物。实验结果表明,与非印迹的聚合物相比较,该印迹聚合物对镉(II)离子具有较好的识别性和选择性。镉(II)印迹聚合物与非印迹聚合物的吸附量分别是42.56mg·g-1和13.95mg·g-1。该法的检出限为0.11ng·mL-1,相对标准偏差为1.79%。将该印迹聚合物用于环境和生物样品中的镉(II)的分离富集和测定,结果令人满意。

A Cd（II）ion imprinted nanometer TiO2/SiO2 composite material was prepared by surface imprinting technique using Cd（II）ion as the template and 3-aminopropyltriethoxysilane as the functional monomer.With the traditional solid sorbents and non-imprinted polymer particles,the ion-imprinted polymers（IIPs）had higher adsorption capacity and selectivity for Cd（II）.The maximum static adsorption capacity of the imprinted and non-imprinted sorbent for Cd（II）was 42.56mg·g^-1and 13.95mg·g^-1,respectively.The detection limit of the method was 0.11ng·mL-1 and relative standard deviation of the eleven replicate determinations was 1.79%.The method was applied for the determination of Cd（II）in environmental samples with satisfactory results.