论文部分内容阅读
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/m L和570~2280 ng/m L范围内与氧化峰电流呈线性,检测限为1.9 ng/m L(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%。
The graphene-gold nanocomposites (graphene-AuNPs) were prepared based on the cation-π non-covalent interaction, and the electrochemical detection of bisphenol A in water samples based on the nanocomposite modified glassy carbon electrode was studied. The composite was characterized by scanning electron microscopy (SEM), EDS spectroscopy and X-ray diffraction (XRD). At the same time, graphene-AuNPs / GCE modified by nanomaterials were prepared. Electrochemical behavior of the electrode surface, and the sensor used in the actual sample bisphenol A content detection. The results show that the prepared composite has stable structure, no agglomeration and no particle agglomeration, and the size of the particles is uniform. The modified nano-material electrode has obvious electrocatalytic activity on bisphenol A, and the current response of bisphenol A on the modified electrode is bare 6.3 times the glassy electrode. Under optimized conditions, bisphenol A was linear with the peak oxidation current in the range of 5.7-570 ng / mL and 570-2280 ng / mL, with a detection limit of 1.9 ng / mL (S / N = 3) . The modified electrode was applied to the detection of bisphenol A in water samples with recovery of 78.91 ~ 115.54%.