作　　者： ; ; ; ; ; ; ; ;

机构地区： 湖南大学环境科学与工程学院

出　　处： 《环境科学》 2013年第3期1211-1217,共7页

摘　　要： 通过化学还原的方法合成有序介孔碳负载纳米金粒子,并构筑有序介孔碳载金/L-赖氨酸/纳米金复合膜修饰玻碳电极;利用扫描电镜观察介孔碳和介孔碳复合膜的微观结构,并用循环伏安法、电化学阻抗谱表征自组装电极的过程.在此基础上用差分脉冲伏安法研究对苯二酚和邻苯二酚混合物在该电极上的电催化氧化,研制了一种基于有序介孔碳载金/L-赖氨酸/纳米金复合膜修饰电极分别检测对苯二酚和邻苯二酚的传感器.在最优的实验条件下,该传感器在对苯二酚和邻苯二酚浓度为1×10-6～8×10-4mol·L-1的范围内具有良好的线性关系,检出限分别为3×10-7mol·L-1、7×10-7mol·L-1. Ordered mesoporous carbon-Au nanoparticles （OMC-Au） nanocomposites were synthesized by a one-step chemical reduction route, and an OMC-Au/L-Lysine/Au composite film-modified glassy carbon electrode （GCE） was constructed. The microstructure of OMC and OMC-Au/L-Lysine/Au composite films were characterized by SEM, and the preparation process of OMC-Au/L-Lysine/Au modified glassy carbon electrode was investigated using cyclic vohammetry and electrochemical impedance spectroscopy. The electrocatalytic oxidation of hydroquinone and catechol on the modified electrode was discussed by differential pulse voltammetry in this study, and a sensor for separate determination of hydroquinone and cateehol based on OMC-Au/L-Lysine/Au modified glassy carbon electrode was developed. Under the optimal conditions, the cathodic peak current was linearly related to hydroquinone concentration over ranges from 1.0 ×10^-6 mol. L-1 to 8.0 ×10^- mol＇L l with a detection limit of 3.0 ×10^- 7 mol·L ^-1, and linearly related to eatechol concentration from 1.0 ×10^-7 mol. L-i to 8.0 ×10^-5 mol. L-i with a detection limit of 8.0 ×10^-7 mol. L-1 .

关 键 词： 有序介孔碳 纳米金粒子 赖氨酸 对苯二酚 邻苯二酚 电化学传感器

领　　域： [环境科学与工程]