一步法制备MWCNTs/PAMT复合膜电极并用于水中痕量Cd^(2+)、Pb^(2+)的同时检测  

One-step Preparation of MWCNTs/PAMT Composite Film Electrode for Simultaneous Determination of Trace Cd^(2+)and Pb^(2+)in Water

作　　者：张立 朱倩 任波源 涂新满[1] ZHANG Li;ZHU Qian;REN Bo-yuan;TU Xin-man(School of Environmental and Chemical Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学环境与化学工程学院,南昌330063

出　　处：《南昌航空大学学报（自然科学版）》2022年第3期30-37,共8页Journal of Nanchang Hangkong University(Natural Sciences)

基　　金：国家自然科学基金(52060019);江西省自然科学基金(20202ACBL204015);江西省重点研发项目(20212BBG73030);南昌航空大学博士启动金(EA202202073)。

摘　　要：通过一步电沉积方式将多壁碳纳米管(MWCNTs)和聚(5−氨基−2−巯基−1,3,4−噻二唑)(PAMT)修饰于玻碳电极表面,形成复合膜。利用循环伏安法和交流阻抗法对所制备的MWCNTs/PAMT复合膜电极进行电化学性能表征。随后,将该电极用于水中痕量Cd^(2+)、Pb^(2+)的同时检测。结果表明:Cd^(2+)和Pb^(2+)在MWCNTs/PAMT复合膜电极上能产生2个独立的差分脉冲信号,信号强度与目标物浓度呈正比。在最佳检测条件下,Cd^(2+)和Pb^(2+)的线性范围分别为1.0~150μg/L和2.0~200μg/L,检测限分别为0.4μg/L和0.3μg/L。6次重复性实验显示,Cd^(2+)和Pb^(2+)检测结果的相对标准偏差分别为3.4%和5.6%。抗干扰实验表明,复合膜电极对Cd^(2+)和Pb^(2+)具有较高选择性响应。本方法制备的MWCNTs/PAMT复合膜电极对水中痕量Cd^(2+)、Pb^(2+)的同时检测具有良好的应用前景。In this work,multi-walled carbon nanotubes(MWCNTs)and poly(2-amino-5-mercapto-1,3,4-thiadiazole)(PAMT)were modified on the surface of a glassy carbon electrode to form a composite film via electrodeposition way.The electrochemical property of the prepared MWCNTs/PAMT composite film electrode was characterized by cyclic voltammetry and AC impedance.Subsequently,it was employed to perform simultaneous detection of trace Cd^(2+)and Pb^(2+)in water.According to the results,Cd^(2+)and Pb^(2+)are capable of generating two independent differential pulse signals on the electrode,and the signal intensity is proportional to the concentration of the targets.Under the optimal conditions,the detection linear range is from1.0 to 150μg/L for Cd^(2+),and that is from 2.0 to 200μg/L for Pb^(2+),and the corresponding detection limit is 0.4μg/L and 0.3μg/L,respectively.The reproducibility assays display that the RSD of the six detection results of Cd^(2+)and Pb^(2+)are 3.4%and 5.6%,respectively.Meanwhile,anti-interference assays show that the composite membrane electrode possesses a high selective response to Cd^(2+)and Pb^(2+).To sum up,the prepared MWCNTs/PAMT composite film electrode owns a promising application prospect forthe simultaneous detection of trace Cd^(2+)and Pb^(2+)in water.

关 键 词：MWCNTs/PAMT复合膜电极 Cd^(2+) Pb^(2+) 同时检测 差分脉冲信号 

分 类 号：U458[建筑科学—桥梁与隧道工程]