金修饰磁性石墨烯基分子印迹复合材料的制备及对水中邻苯二甲酸二正丁酯的电化学传感检测

Preparation of Gold-modified Magnetic Graphene-based Molecularly Imprinted Composites and Electrochemical Sensing Detection of Dinbutyl Phthalate in Water

以金修饰磁性石墨烯(Au@Fe3O4@RGO)为载体,通过表面分子印迹技术,选择水环境中邻苯二甲酸二正丁酯(DBP)为模板分子,制备了金修饰磁性石墨烯基分子印迹复合膜(Au@Fe3O4@RGO-MIP);通过扫描电子显微镜(TEM)、X射线衍射(XRD)、傅里叶变换红外光谱(FTIR)等测试手段对其进行了分析表征.以Au@Fe3O4@RGO-MIP作为传感器识别元件的敏感材料,利用循环伏安(CV)、电化学阻抗谱(EIS)和差分脉冲(DPV)等电化学分析方法,对构建的分子印迹电化学传感器进行了性能分析,结果表明,该传感器对水环境中DBP的响应平衡时间为6 min,在0. 01～0. 1μmol/L范围内,DBP浓度与响应电流之间呈现良好的线性关系,检出限为0. 3049 nmol/L(S/N=3).

Gold-modified magnetic graphene(Au@Fe3O4@RGO) was used as a carrier to select gold- modified magnetic properties and using surface molecular imprinting technique to select dinbutyl phthalate(DBP) as a template molecule in water environment. Graphene-based molecularly imprinted composite membrane( Au@Fe3O4@RGO-MIP ) was prepared and characterized by means of transmission electron microscopy(TEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy(FTIR). Au@Fe3O4@RGO-MIP was used as the sensitive material for sensor identification components. The performance of molecularly imprinted electrochemical sensors was analyzed by cyclic voltammetry(CV), electrochemical impedance spectroscopy(EIS) and differential pulse(DPV). The results show that the equilibrium time of the molecularly imprinted electrochemical sensor for dinbutyl phthalate in water environment is 6 min. In the concentration range of 0.01-0.1 μmol/L, there is a good linear relationship between DBP concentration and response current. The minimum detection limit is 0.3049 nmol/L(S/N=3).