基于羧基化多壁碳纳米管修饰玻碳电极快速检测氨基脲的研究

发布时间：2018-04-24 05:09

本文选题：羧基化 + 多壁碳纳米管　；参考：《分析化学》2017年10期

【摘要】：基于羧基化多壁碳纳米管修饰的玻碳电极(CMWCNTs/GCE),构建了一种灵敏检测氨基脲(SEM)的电化学传感器。采用傅里叶变换红外光谱、透射电子显微镜、电化学阻抗谱对修饰材料进行表征。结果表明,羧基化的多壁碳纳米管出现羧基碳氧双键的红外特征峰,管径明显减小,长度变短,电化学阻抗值显著减小。在1 mol/L HAc-NaAc缓冲液中,利用循环伏安法和时间-电流曲线研究了SEM在CMWCNTs修饰电极上的电化学行为。SEM在修饰电极上呈现不可逆的氧化峰。与裸电极相比,氧化峰电流明显增大。在最佳实验条件(pH 7.0,扫描速度为0.1 V/s)下,测得SEM在5.00×10~(-6)~1.09×10~(-3)mol/L浓度范围内与氧化峰电流呈线性关系,线性方程为I_P(μA)=-0.472+0.0599C(μmol/L),相关系数r=0.997,检出限为1.88×10~(-7)mol/L(S/N=3)。在实际猪肝样品检测中加标回收率为92.8%~98.0%。
[Abstract]:Based on the carboxylated multiwalled carbon nanotube modified glassy carbon electrode (CMWCNTs / GCEN), a sensitive electrochemical sensor for the detection of semicarbazone (SEM) was constructed. The modified materials were characterized by Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM) and electrochemical impedance spectroscopy (EIS). The results show that the carboxylated multi-walled carbon nanotubes have the infrared characteristic peaks of carboxyl carbon-oxygen double bonds, the diameter of the tubes is obviously reduced, the length of the tubes is shortened, and the electrochemical impedance value is significantly reduced. The electrochemical behavior of SEM on CMWCNTs modified electrode was studied by cyclic voltammetry and time-current curves in 1 mol/L HAc-NaAc buffer. Compared with the bare electrode, the oxidation peak current is obviously increased. Under the optimum conditions of pH 7.0 and scanning velocity of 0.1 V / s, the linear relationship between SEM and oxidation peak current was obtained in the concentration range of 5.00 脳 10 ~ (-10) ~ (-6) 10~(-3)mol/L. The linear equation was I _ P (渭 A ~ + -0.472 0.0599C, r _ (0.997)), and the detection limit was 1.88 脳 10 ~ (-1) ~ (-7) mol 路L ~ (-1) N ~ (-1) ~ (-1) ~ (-1). The linear equation was: I (渭 A) -0.472 0.0599C (渭 mol 路L ~ (-1)). The recovery rate was 92.8% and 98.0% respectively.
【作者单位】：河南工业大学粮油食品学院;
【基金】：国家自然基金项目(No.61301037) 河南省科技开放合作项目(No.172106000014) 河南省省属高校基本科研业务费专项资金项目(No.2014YWQQ05) 河南工业大学青年骨干教师培育计划项目资助~~
【分类号】：O657.1;TS251.9

【相似文献】