抗坏血酸在壳聚糖-碳纳米管-二茂铁复合修饰玻碳电极上的电化学行为

The electrochemical behavior of ascorbic acid on chitosan-carbon nanotube-ferrocene modified glassy carbon electrode

制备了壳聚糖-碳纳米管修饰玻碳电极(CHIT-MWCNTs/GCE)、二茂铁修饰玻碳电极(Fc/GCE)两种修饰玻碳电极,结果表明,制备的修饰玻碳电极对抗坏血酸(AA)的氧化有明显电催化作用。用CHIT-MWCNTs/GCE、Fc/GCE两种电极来检测水中AA浓度,利用循环伏安CV曲线分析电流和电位的变化得到AA在修饰玻碳电极上的电化学行为。结果表明,p H=5.97,磷酸缓冲溶液(PBS)浓度为50 mmol/L的支持电解质溶液下,制备的修饰玻碳电极有效检测AA的浓度范围为0.1~10 mmol/L,检出限为0.01 mmol/L。扫描速度与峰电流呈良好的线性相关关系y=-0.080 31X-1.994 53,r=-0.99,表明该反应机理受吸附控制。

Two kinds of modified glassy carbon electrodes were prepareed： Chitosan-Carbon Nanotube Modified Glassy Carbon Electrode（ CHIT-MWCNTs/GCE） and Ferrocene modified glassy carbon electrode（ Fc/GCE）. Results show that the modified glassy carbon electrodes have obvious electrocatalytic activity for oxidation of ascorbic acid（ AA）. Test is mainly used two kinds of electrodes to detect AA： CHITMWCNTs/GCE and Fc/GCE,according to cyclic voltammetry method to analyse the current and potential changes to give AA electrochemical behavior of the electrodes. Result show that the supporting electrolyte solution contain p H = 5. 97,the PBS concentration is 50 mmol/L,the effective detection range of concentrations of ascorbic acid is 0. 1 ~ 10 mmol/L. The detection limit is 0. 01 mmol/L. Scanning speed and peak current showed a good linear relationship： y =-0. 080 31 X-1. 994 53,r =-0. 99. This indicates that the reaction is controlled by adsorption. This method is a reliable,fast and sensitive detection method,it can be used for the determination of the AA.