非共价作用石墨烯-金纳米复合材料修饰电极的制备及检测双酚A的方法研究

Preparation of an Electrode Modified with Graphene-gold Nanoparticles Based on Non-covalent Interaction and Its Application for Bisphenol A Detection

摘要:

基于阳离子-π非共价作用力制备石墨烯-金纳米复合材料（graphene-AuNPs），研究基于该纳米复合材料修饰玻碳电极建立电化学传感定量检测水样中双酚A的方法。采用扫描电镜（SEM），EDS能谱和X-射线衍射（XRD）技术对该复合材料进行表征，同时制备基于纳米材料修饰的玻碳电极（graphene-AuNPs/GCE），研究双酚A在修饰电极表面的电化学行为，并将该传感器应用于实际样品中双酚A含量的检测。结果表明，所制备的复合材料结构稳定，分散无团聚现象，粒子尺寸大小均匀；所修饰的纳米材料电极对双酚A有明显的电催化性能，双酚A在修饰电极上的电流响应是裸玻电极的6.3倍。在优化条件下，双酚A在浓度为5.7~570 ng/mL和570~2280 ng/mL范围内与氧化峰电流呈线性，检测限为1.9 ng/mL（S/N=3）。将该修饰电极应用于水体样品中双酚A的检测，回收率在78.91~115.54%。

Abstract:

A graphene-gold nanoparticle (graphene-AuNP) composite material was prepared based on cation-π non-covalent interaction and used to modify an electrochemical sensor for the quantitative detection of bisphenol A (BPA) in water samples. Scanning electron microscopy (SEM), energy-dispersive spectrum (EDS) and X-ray diffraction (XRD) techniques were utilized to characterize the graphene-AuNP composite material. Meanwhile, a graphene-AuNP modified glassy carbon electrode (graphene-AuNPs/GCE) was prepared, the electrochemical behavior of BPA on the surface of the graphene-AuNP/GCE was studied, and the developed sensor was applied to the detection of BPA levels in actual samples. The results showed that the composite material structure was stable, the particle size was uniform, and there was no aggregation. The modified electrode exhibited a significant electro-catalytic effect on BPA, and the current response of BPA on the modified electrodes was 6.3 times higher than that of the bare glass electrode. Under optimized conditions, BPA showed a linear relationship with the oxidation peak current in the concentration ranges of 5.7~570 ng/mL and 570~2280 ng/mL, with a limit of detection (LOD) of 1.9 ng/mL (S/N=3). The modified electrode was applied to the analysis of BPA in water samples, and the recovery rate ranged from 78.91 to 115.54 %.