PEI/SiO2纳米粒子自组装修饰电极及六价铬离子的电化学发光分析方法研究

Electrochemiluminescence analysis of chromium(Ⅵ)based on PEI/SiO_2 nanoparticles self-assemble modified electrode

利用反相微乳液方法合成了PEI/SiO2复合纳米粒子,通过透射电子显微镜(TEM)、Zeta电位对该复合纳米粒子进行了表征。该复合纳米粒子可以基于超分子作用自组装于Nafion/CNT修饰电极表面,并基于该修饰电极对铬酸根(CrO2-4)的富集效应及CrO2-4的电还原产物Cr(Ⅲ)对鲁米诺-H2O2化学发光体系强烈的催化作用,建立了一种高选择性的测定六价铬离子Cr(Ⅵ)的电化学发光新方法。

PEI/SiO2nanoparticles were synthesized by the reverse micromulsion method, and the particles were characterized by TEM and Zeta potential. By self-assembling of the as-prepared composite nanoparticles on the Nafion/CNT film coated grapite electrode, a functional modified electrode could be obtained. Based on the strong enrichment ability of the functional modified e- lectrode to CrO42 and strong enhancement of Cr （Ⅲ） to chemiluminescence signal of luminol-H2 02 system, a highly selective ECL method for detecting Cr （Ⅵ） was developed.