氮掺杂碳纳米管修饰电极对日落黄的电化学检测  

Electrochemical Detection of Sunset Yellow by Nitrogen-doped Carbon Nanotube-modified Electrodes

作　　者：胡耀娟 潘昊哲 桑文静 HU Yao-juan;PAN Hao-zhe;SANG Wen-jing(School of Environmental Science,Nanjing Xiaozhuang University,Nanjing 211171,China)

机构地区：[1]南京晓庄学院环境科学学院,江苏南京211171

出　　处：《南京晓庄学院学报》2024年第6期1-8,共8页Journal of Nanjing Xiaozhuang University

基　　金：国家自然科学基金面上项目(22277057);江苏省自然科学基金面上项目(BK20211013)。

摘　　要：本文利用氮掺杂碳纳米管对玻碳电极进行修饰,构建了日落黄电化学传感器。循环伏安法(CV)结果表明,与裸玻碳电极相比,氮掺杂碳纳米管修饰的玻碳电极(N-MCNT)对日落黄(Sunset Yellow,SY)的氧化反应具有更高的电催化活性。同时讨论了扫描速率、电解质溶液的pH值对日落黄氧化峰电流和峰电位的影响。差分脉冲伏安法(DPV)结果显示,SY在氮掺杂碳纳米管修饰电极上的电流响应与浓度呈线性关系,且线性范围为0.2~100μmol/L,检测限约为0.03μmol/L。在此基础上,所构建的SY电化学传感器对饮料样品中的日落黄检测表现出宽线性范围、低检测限、高稳定性、以及优良的选择性,该结果为食品中偶氮类染料的检测提供了一定的理论依据。In this work,the sunset yellow electrochemical sensor was constructed by nitrogen doped carbon nanotubes modified glassy carbon electrode(N-MCNT/GCE).The cyclic voltammetry(CV)results showed that,compared with the bare glassy carbon electrode(GCE),the N-MCNT/GCE exhibited higher electrocatalytic activity for the oxidation reaction of sunset yellow(SY).The effects of scanning rate and pH value of electrolyte solution on the peak current and potential of sunset yellow oxidation reaction were also discussed.The differential pulse voltammetry(DPV)results showed that,the response of SY on N-MCNT/GCE was linearly related to concentration,with a linear range of 0.2~100μmol/L,detection limit of approximately 0.03μmol/L.On this basis,the constructed SY sensor exhibited wide linear range,low detection limit,good stability and selectivity for the detection of sunset yellow in beverages,providing a certain theoretical basis for the detection of azo dyes in foods.

关 键 词：氮掺杂碳纳米管 循环伏安法 差分脉冲伏安法 日落黄 

分 类 号：O646[理学—物理化学]