亚甲基蓝与纳米金复合修饰电极的制备及对汞离子的检测  

Preparation of a composite electrode modified with methylene blue and gold nanoparticle and its application for the detection of mercury ions

作　　者：于光辉 马逊风 于洪斌[1] YU Guang-hui;MA Xun-feng;YU Hong-bin(School of Environment,Northeast Normal University,Changchun 130117,China)

机构地区：[1]东北师范大学环境学院

出　　处：《东北师大学报（自然科学版）》2019年第2期152-156,共5页Journal of Northeast Normal University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51878133)

摘　　要：以亚甲基蓝及纳米金复合修饰玻碳电极为基础电极,自组装修饰DL-1,4-二硫苏糖醇,用以检测汞离子.同时,利用扫描电镜观察了电极表面形貌,并对元素组成进行了分析;采用交流阻抗法研究了电极的电化学特性,分析了制备过程对电极的影响;采用差分脉冲伏安法检测汞离子,考察了吸附时间、缓冲液种类以及pH值等因素对汞离子检测过程的影响.结果表明:吸附时间为35min,pH=6,以Tris溶液为缓冲液时,测试条件最佳;检测汞离子的线性范围为1.0×10^-9~1.0×10^-3 mol/L,检测限为5.4×10^-10 mol/L.最后考察了地表水中常见离子的干扰作用,显示所制备电极对汞离子检测具有良好的选择性.A composite electrode was prepared to detect mercury ions.The electrode was first modified with methylene blue and gold nanoparticles,and then self-assembled with DL-1,4-dithiothreitol.The morphologies and elements of the electrode surface were analyzed by a scanning electron microscope with an energy dispersive spectrometer.The electrochemical properties of the electrode were studied by electrochemical impedance spectroscopy.In this work,differential pulse voltammetry was used to detect mercury,and the effects of adsorption time,pH and buffer types on the detection of mercury ions were investigated.The experimental results indicated that mercury ions could be effectively detected in the Tris solution(pH=6),and the optimal adsorption time was 35 min.The linear range was 1.0×10^-9~1.0×10^-3 mol/L,and the detection limit was 5.4×10^-10 mol/L.The results of interference experiments revealed that the electrode prepared here had good selectivity for the detection of mercury ions.

关 键 词：金纳米粒子 亚甲基蓝 DL-1 4-二硫苏糖醇 汞离子 电化学检测 

分 类 号：X832[环境科学与工程—环境工程]