基于CS-GO/AgNPs氯酚分子印迹电化学传感器的构建

Construction of chlorophenol molecularly imprinted electrochemical sensor based on CS-GO/AgNPs

以2,4-二氯苯酚(2,4-DCP)为模板分子,吡咯(Py)为功能单体,协同壳聚糖-银纳米粒子氧化石墨烯(CS-GO/AgNPs)复合材料增强电导性,在玻碳电极(GCE)表面制备分子印迹膜,构建了2,4-DCP分子印迹电化学传感器(2,4-DCP-MIECS)并用于水环境中氯酚的特异性识别与检测。通过透射电子显微镜(TEM)、X射线衍射仪(XRD)对GO/AgNPs复合材料进行分析表征,采用循环伏安法(CV)、交流阻抗法(EIS)对电化学传感器进行性能表征。采用差分脉冲伏安法(DPV)对2,4-DCP进行检测,该电化学传感器的线性范围为1.0~1.0×10^(3)pmol/L,检出限为0.1 pmol/L,该传感器已用于水样品中2,4-DCP的检测。

The molecularly imprinted membrane was prepared on the surface of glassy carbon electrode(GCE)to construct 2,4-DCP molecularly imprinted electrochemical sensor(2,4-DCP-MIECS)for the specific recognition and detection of chlorophenol in the water environment.The 2,4-dichlorophenol(2,4-DCP)was usd as the template molecule,pyrrole(Py)was utilized as the functional monomer,and chitosan-silver nanoparticle graphene oxide(CS-GO/AgNPs)composite was employed as signal enhancing element.The GO/AgNPs composite material was analyzed and characterized by transmission electron microscope(TEM)and X-ray diffractometer(XRD),and the electrochemical sensor performance was characterized by cyclic voltammetry(CV)and alternating current impedance method(EIS).Differential pulse voltammetry(DPV)was used to detect2,4-DCP.The linear range of the electrochemical sensor for the target was 1.0-1×10^(3) pmol/L,and the detection limit was 0.1 pmol/L.This sensor has been successfully applied to detect actual samples,and provides a new method for the detection of 2,4-DCP in water samples.