三维石墨烯/多壁碳纳米管修饰电极的制备及对甲巯咪唑的测定  

Preparation of Three-dimensional Graphene/MWCNTs Composite Modified Electrode and Its Application for Determination of Methimazole

作　　者：梁宁刚 李娟娟[1] 蔡卓[1] 蒋翠文[1] 叶丹妮[1] LIANG Ninggang;LI Juanjuan;CAI Zhuo;JIANG Cuiwen;YE Danni(School of Chemistry and Chemical Engineering,Guangzi University,Nanning 530004,China)

机构地区：[1]广西大学化学化工学院,广西南宁530004

出　　处：《山西大学学报（自然科学版）》2019年第1期211-218,共8页Journal of Shanxi University(Natural Science Edition)

基　　金：广西自然科学基金项目(2015GXNSFAA139239)

摘　　要：通过滴涂法制备了3DGR/MWCNTs/GCE修饰电极,用电化学交流阻抗(EIS)对其进行表征。以循环伏安法(CV)、恒电位库伦分析法(CPC)、线性扫描伏安法(LSV)和计时电量法(CC)研究了甲巯咪唑的电化学行为。结果表明:在pH 2.6的B-R缓冲溶液中,甲巯咪唑在3DGR/MWCNTs/GCE修饰电极上是受扩散控制的双电子和双质子转移的氧化还原过程,扩散系数D=3.461 4×10-6 cm2/s、电极有效面积A=0.061 8cm2.在1.0×10-6～1.0×10-4mol/L浓度范围内,还原峰电流与甲巯咪唑的浓度呈良好线性关系,方法检出限为5.94×10-7 mol/L.The 3DGR/MWCNTs/GCE electrode was prepared by a drop-coating method,and was characterized by electrochemical impedance spectroscopy(EIS).The electrochemical behavior of methimazole was studied by cyclic voltammetry(CV),constant potential coulometry(CPC),linear sweep voltammetry(LSV)and chronocoulometry(CC).The experimental results showed that the reaction of methimazole at3DGR/MWCNTs/GCE was redox with two electrodes and two protons transfer,and controlled by diffusion in the B-R buffer solution at pH 2.6.The diffusion coefficient(D)was 3.461 4×10^-6 cm^2/s,the effective area of electrode(A)was 0.061 8cm^2.The methimazole content and reduction peak current showed a good linear relationship in the range of 1.0×10^-6-1.0×10^-4 mol/L,and the detection limit was5.94×10^-7 mol/L.

关 键 词：修饰电极 多壁碳纳米管 三维石墨烯 甲巯咪唑 

分 类 号：O657.1[理学—分析化学] R914[理学—化学]