用于检测重金属离子的磁性荧光复合微球  

Magnetic Fluorescence Composite Microspheres for Detection of Heavy Metal Ions

作　　者：姚爱华[1,2] 李鹏飞[1] 周田[1] 王德平[1,2] 

机构地区：[1]同济大学材料科学与工程学院,上海200092 [2]同济大学先进土木工程材料教育部重点实验室,上海200092

出　　处：《无机化学学报》2014年第2期303-309,共7页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.50702037);上海市自然科学基金(No.13ZR1444200);中央高校基本科研业务费专项基金资助项目

摘　　要：采用静电逐层自组装的方法,首先将PSS和PAH聚电解质交替沉积在CaCO3中空微球表面,然后将Fe3O4磁性纳米粒子与CdSe量子点负载在中空微球表面不同的聚电解质层中,制备出具有磁性和荧光双重功能的复合微球,并将其作为荧光离子探针,研究了其对Cu2+和Pb2+离子检测的灵敏度、选择性及可行性。结果表明,复合微球显示出良好的磁性和荧光性能,对Cu2+和Pb2+离子的检测具有较高的灵敏度和选择性。尤为重要的是,可通过磁分离的方法将微球快速地从待测液中回收,从而能够避免量子点对环境造成的二次污染。Magnetic fluorescence composite microspheres were fabricated through a layer-by-layer electrostatic self-assembly method. Polyelectrolyte layers were firstly assembled onto the CaCO3 hollow microspheres by the sequential deposition of the PSSand PAHpolyelectrolyte. And then Fe3O4 nanoparticles and CdSe quantum dots were simultaneously assembled onto the hollow microspheres. Furthermore, the resulting magnetic fluorescence composite microspheres were utilized as a chemosensor for the detection of Cu2＋ and Pb2＋ in aqueous solutions. The results showed that the composite microspheres exhibited strong fluorescence and magnetism, high sensitivity and selectivity towards Cu2＋ and Pb2＋. Most importantly, it is easy to separate and recycle the composite microspheres from the detection solution using a commercial magnet, thus avoiding secondary contamination and promoting the practical applications of quantum dots.

关 键 词：磁性纳米粒子 CDSE量子点 中空微球 静电逐层自组装 重金属检测 

分 类 号：O657[理学—分析化学]