采用化学共沉淀法合成硅包覆的磁性纳米粒子Fe3O4@SiO2,进一步通过六亚甲基二异氰酸酯将吡哆酰肼分子(Pyh)接枝到Fe3O4@SiO2表面,制得功能化的磁性纳米复合物(Fe3O4@SiO2-Pyh).通过傅里叶变换红外光谱、透射电子显微镜、X射线衍射等技术手段对其结构、形貌和磁性能进行了表征.Fe3 O4@SiO2-Pyh粒子具有规则的核壳结构,粒径分布在50 ～ 55 nm,壳层厚度约为15 nm.Fe3O4@SiO2-Pyh结构中含有酰腙类活性基团—CO—NH—N=CH—,能与Cu2形成稳定的配合物,在此基础上采用紫外可见吸收光谱特性建立了测定Cu2+的分析方法,线性范围为3.4 ×10-7～4.5×10-6 mol/L,检出限为1.03×10-7 mol/L.此外,利用Fe3O4@SiO2-Pyh良好的磁响应,通过外部磁场能够有效地除去水中过量的铜离子,在环境领域具有潜在的应用价值.
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