水溶性柱[5]芳烃石墨烯复合物对硝基酚异构体的识别与检测

Identification and detection of nitrophenol isomers by water-soluble pillar [5] arene graphene composites

釆用湿化学法一步合成水溶性阳离子柱[5]芳烃(CP5)功能化还原石墨烯(RGO)复合物(CP5-RGO)。通过红外、光电子能谱等对复合物CP5-RGO进行了表征。使用CP5-RGO构建电化学传感器CP5-RGO/GCE,采用DPV法实现了硝基酚3种异构体的分离与检测。由于CP5的存在从而导致工作电极CP5-RGO/GCE在不同的异构体溶液中有不同的峰电流和峰电位,以此起到区分和识别的作用。DPV结果表明,间硝基酚(m-NP)和对位硝基酚(p-NP)在CP5-RGO修饰电极上峰电流值有明显的增强,而邻硝基酚(o-NP)的峰电流值明显的减小。并实现了对p-NP进行定量检测,其线性范围为0. 1～50μmol/L,检出限为0. 03μmol/L。构建的CP5-RGO/GCE有望应用在环境污染物的监测。

In this paper,a wet chemical method was adopted to synthesize the water-soluble cationic pillar[5] arene( CP5) functional reduction graphene( RGO) composites. The CP5-RGO was characterized by FTIR and photoelectron spectroscopy. The working electrode CP5-RGO/GCE was prepared by the composites CP5-RGO. The separation and detection of nitrophenol isomers were also realized by DPV. Due to the existence of CP5,the working electrode CP5-RGO/GCE exhibited different peak currents and peak potentials in different isomer solutions. The DPV results showed a significant increase in peak current values for m-nitrophenol( m-NP) and p-nitrophenol( p-NP) on CP5-RGO modified electrodes,while the peak current value of o-nitrophenol( o-NP) was significantly reduced near zero. This phenomenon was mainly caused by the difference between the nitrophenol isomers. In addition,the CP5-RGO modified GCE was used for detecting p-NP. A low detection limit of 0. 03 μmol/L and a linear response range of 0. 1-50 μmol/L for p-NP were obtained by using this method,which showed a better effect compared with the reported literature. The constructed electrochemical sensing platform CP5-RGO/GCE was expected to be applied to the monitoring of environmental pollutants.