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多壁碳纳米管修饰玻碳电极伏安法测定香草醛
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作者单位
刘晓鹏,刘国强,邓培红,贺曦,肖裔繁,梁贤文,姜宏达 1.衡阳师范学院化学与材料科学学院功能金属有机化合物湖南省重点实验室
2.湖南工业大学生命科学与化学学院 
基金项目:湖南省自然科学基金资助项目(2016JJ4010);衡阳师范学院第十八届大学生课外学术科技作品竞赛重点项目(校科字[2018]2号-22)
中文摘要:制备了羧基化多壁碳纳米管修饰玻碳电极(c-MWCNTs/GCE),采用循环伏安法在0.5 mol/L HCl中研究了食品添加剂香草醛的电化学行为。结果显示,该修饰电极对香草醛的电化学氧化具有良好的电催化作用,与裸玻碳电极相比电流响应显著增强。香草醛在该修饰电极上的氧化为不可逆的扩散控制过程。在最佳条件下,采用二阶导数线性扫描伏安法进行测定,香草醛的氧化峰电流与其浓度在0.1~6.0 μmol/L和6.0~100 μmol/L范围内呈良好的线性关系,检出限(S/N=3)为0.02 μmol/L。该修饰电极具有良好的重现性(RSD=4.6%)和稳定性。方法应用于食品中香草醛的测定,回收率为96.3%~104%。
中文关键词:羧基化多壁碳纳米管(c-MWCNTs)  香草醛  电化学行为  伏安测定
 
Voltammetric Determination of Vanillin on a Multi-walled Carbon Nanotubes Modified Glassy Carbon Electrode
Abstract:A carboxylated multi walled carbon nanotubes modified glassy carbon electrode(c-MWCNTs/GCE) was fabricated,and the electrochemical behavior of vanillin was studied in 0.5 mol/L HCl using cyclic voltammetry.Results revealed that the modified electrode showed an better electrocatalytic activity toward the oxidation of vanillin by a significant enhancement in the current response compared with that of the bare glassy carbon electrode.The oxidation of vanillin at this electrode was irreversible and diffusion controlled.Under the optimum conditions,by second order derivative linear scan voltammetry,the anodic peak current showed a linear relation versus vanillin concentration in the ranges of 0.1-6.0 μmol/L and 6.0-100 μmol/L with a detection limit(S/N=3)of 0.02 μmol/L.Moreover,the modified electrode demonstrated a good reproducibility(RSD=4.6%) and a long term stability.This method was applied in the determination of vanillin in food samples with recoveries of 96.3%-104%.
Key Words:carboxylated multi-walled carbon nanotubes(c-MWCNTs)  vanillin  electrochemical behavior  voltammetric determination
引用本文:刘晓鹏,刘国强,邓培红,贺曦,肖裔繁,梁贤文,姜宏达.多壁碳纳米管修饰玻碳电极伏安法测定香草醛[J].分析测试学报,2019,(3):312-317.
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