中空微球氧化铁修饰电极的制备及对汞离子的测定

The Preparation of Hollow Iron Oxide Modified Electrodes and the Determination of Mercury Ions

以水热合成法制备了中空微球Fe_3O_4纳米粒子,运用透射电镜(TEM)和扫描电镜(SEM)对其进行表征。将该纳米材料修饰到玻碳电极表面,修饰电极对汞离子表现出良好的电化学响应,成功制备了用于检测Hg^(2+)的电化学传感器。通过优化实验条件,汞离子的氧化峰电流与其浓度呈现良好的线性关系,其线性范围为1.0×10^(-7)~8.8×10^(-5)mol/L,相关系数为0.994,检出限为3.0×10^(-5)mol/L。实验表明,制备的传感器用于对Hg^(2+)检测的结果令人满意,而且其稳定性和重现性好,有望实现对污水中低浓度Hg^(2+)的检测。

In this paper, the hollow microspheres Fe3O4 nanoparticles were prepared by a hydrothermal synthesis .And using transmission electron microscopy （TEM） and scanning electron microscopy （SEM） for characterization. An electrochemical sensor for Hg（II） fabricated based on the glass carbon electrode modified with the hollow microspheres Fe3O4 nanoparticles. In the optimization of experimental conditions, the linear range is found to be 1.0×10^-7 to 8.8×10^-5mol/L （R^2=0.994）, and the detection limit of 3.0 ×10^-8mol/L. The sensor exhibited high stability and reproducibility. There is hope for the wastewater of low concentration Hg^2＋ detection.