Beijing key Laboratory of sensor, Beijing Information Science & Technology University, Beijing 100101, China.
Key Laboratory of Modern Measurement and Control Technology, Ministry of Education, Beijing Information Science and Technology University, Beijing 100192, China.
Sensors (Basel). 2020 Feb 13;20(4):1004. doi: 10.3390/s20041004.
A novel electrochemical sensor based on electropolymerized ion imprinted poly (o-phenylenediamine) PoPD/electrochemical reduced graphene (ERGO) composite on glass carbon electrode (GCE) was fabricated for selective and sensitive determination of trace Cd(II) in water. ERGO was first deposited on the surface of GCE by electrochemical cyclic voltammetry (CV) scanning to enhance the electron transport activity at electrode surface. The ion imprinted polymer (IIP) of imprinted PoPD was then in situ electropolymerized on ERGO via CV scanning with oPD as functional monomer and Cd(II) ions as template, following removal of the template using electrochemical peroxidation method. The obtained imprinted PoPD/RERGO composites were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), and X-ray energy spectroscopy (EDS) for the observation of their morphologies and components. The electrochemical behavior of the imprinted PoPD/ERGO/GCE was performed by CV and SWASV. The fabricated sensor of the imprinted PoPD/ERGO/GCE showed a good selectivity toward target Cd(II) ions in the presence of other heavy metal ions. Under the optimized experimental conditions, the sensor exhibited a good linear relationship between SWASV stripping peak values and Cd(II) concentration in the range of 1 to 50 ng/mL, with the limit of detection as 0.13 ng/mL (S/N = 3). The proposed electrochemical sensor of imprinted PoPD/ERGO/GCE was successfully applied for trace Cd(II) determination in real water samples.
一种基于电聚合离子印迹聚邻苯二胺（PoPD）/电化学还原氧化石墨烯（ERGO）复合修饰玻碳电极（GCE）的新型电化学传感器，用于选择性和灵敏地测定水中痕量 Cd(II)。首先通过电化学循环伏安法（CV）扫描在 GCE 表面沉积 ERGO，以增强电极表面的电子传输活性。然后，以邻苯二胺（oPD）为功能单体，Cd(II)离子为模板，通过 CV 扫描在 ERGO 上原位电聚合印迹 PoPD，随后使用电化学过氧化物法去除模板。通过扫描电子显微镜（SEM）、透射电子显微镜（TEM）和 X 射线能谱（EDS）对印迹 PoPD/RERGO 复合材料进行了形貌和组成观察。通过 CV 和 SWASV 对印迹 PoPD/ERGO/GCE 的电化学行为进行了研究。在存在其他重金属离子的情况下，印迹 PoPD/ERGO/GCE 传感器对目标 Cd(II)离子表现出良好的选择性。在优化的实验条件下，传感器在 1 至 50ng/mL 范围内显示出 SWASV 剥离峰值与 Cd(II)浓度之间的良好线性关系，检测限为 0.13ng/mL（S/N=3）。该印迹 PoPD/ERGO/GCE 电化学传感器成功应用于实际水样中痕量 Cd(II)的测定。
