纳米金-壳聚糖/多壁碳纳米管修饰的玻碳电极检测水中微量的孔雀石绿

目的制备基于纳米金-壳聚糖/多壁碳纳米管修饰的玻碳电极,用于检测水样中微量的孔雀石绿。方法实验利用电沉积法首先在玻碳电极表面沉积金纳米颗粒,然后利用溶剂蒸发法在纳米金层表面再修饰混有壳聚糖的羧基化多壁碳纳米管。实验设计以多壁碳纳米管/纳米金共修饰的玻碳电极作为电化学传感元件,采用循环伏安法(CV)和微分脉冲伏安法(DPV)检测MG。结果表明电极的修饰膜可加速MG的电子传递速率,促进电位变化,并显著增强MG的氧化峰电流。得到的差分脉冲峰电流与孔雀石绿浓度对数值在2.5×10-9～2.5×10-4 mol/L范围内呈良好线性关系,检测限为9.3×10-10 mol/L。结论本研究制备的基于纳米金-壳聚糖/多壁碳纳米管修饰玻碳电极的电化学传感器适于孔雀石绿的快速、灵敏检测。

AuNPs-chitosan/MWNTs modified GCE used for detection of trace malachite green in water

ABSTRACT: Objectives To prepare an AuNPs-Chitosan/MWNTs modified GCE for detection of the trace malachite green in water. Methods First, the AuNPs was modified on the GCE by electrodeposition, and then further modified with a mix of MWNTs-COOH and Chitosan by evaporating solvent method. The multi-walled carbon nantubes and Au nanoparticles co-modified GCE is described for the determination of malachite green (MG). The electrochemical profile of MG was examined using cyclic voltammetry (CV) and differential pulse voltammetry (DPV). Results The results suggested that the modified film on the GCE facilitated the electron transfer of MG in terms of a potential shift and then significantly enhanced the oxidation peak current of MG. The obtained DPV current peak showed a good linear relation with the Logarithm of the concentration of MG in the range from 2.5×10?9 to 2.5×10?4 mol/L, the detection limit was 9.3×10?10 mol/L. Conclusion The prepared GCE for electrochemical sensor was applicable to detecting MG, rapidly and sensitively.