纳米金/Nafion/石墨烯修饰玻碳电极检测对苯二酚的研究

Study on Determination of Hydroquinone Using Gold Nanoparticles/ Nafion/Graphene Modified Glassy Carbon Electrodes

采用一步电化学共还原的方法将纳米金(AuNPs)、Nafion、电化学还原石墨烯(ERGO)修饰到玻碳电极(GCE)表面,制成修饰电极AuNPs/Nafion/ERGO/GCE。以扫描电镜对其进行表征,用循环伏安法和微分脉冲伏安法研究对苯二酚在该修饰电极上的电催化行为。优化了实验参数,对苯二酚在2.0～100μmol/L及100～800μmol/L浓度范围内与其氧化峰电流呈良好的线性关系,检出限为0.3μmol/L。用该修饰电极成功地进行了实际水样中对苯二酚含量的测定。

Au nanoparticles（AuNPs）,Nafion and electrochemical reduced graphene oxide（ERGO） were modified onto the surface of a glassy carbon electrode（GCE） by one-step electrochemical co-reduction to fabricate a modified electrode of AuNPs/Nafion/ERGO/GCE.Scanning electron microscopy（SEM） was used to characterize the electrode.The electrocatalytical behaviors of the modified electrode towards hydroquinone（HQ） were investigated by cyclic voltammetry（CV） and differential pulse voltammetry（DPV）.Experimental parameters were optimized.A good linear relationship between oxidation peak current of HQ and its concentration was obtained in the range of 2.0-100 μmol/L and 100-80 μmol/L ，with a detection limit of 0.3 μmol/L.This fabricated electrode was successfully applied in the determination of HQ in real samples.