磁性石墨烯修饰辛基酚印迹传感器制备及应用研究

Magnetic Graphene Modified Imprinted Electrochemical Sensor for Detection of 4-Octylphenol

以辛基酚(4-OP)为模板分子,多巴胺为功能单体,采用电聚合技术在磁性石墨烯修饰碳电极表面制备对辛基酚具有高选择性与灵敏性的印迹电化学传感器。采用循环伏安法(CV)和差分脉冲伏安法(DPV)对此印迹传感器的电化学性能进行详细表征;采用扫描电子显微技术对修饰电极的形貌进行表征。结果表明,此印迹电化学传感器对辛基酚具有良好的特异识别性能。采用DPV法考察了孵化时间和洗脱溶剂对印迹传感器性能影响,结果表明,最佳孵化时间为14 min。此印迹电化学传感器的响应电流(△I_R)与辛基酚在5.0×10^(-6)~5.0×10^(-9)mol/L范围内浓度的负对数(-lg C)呈良好的线性关系,线性方程为"IR(m A)=-0.25lg C(mol/L)+2.35,检出限为3.64×10^(-10)mol/L(S/N=3)。此印迹电化学传感器对辛基酚具有良好的选择性和灵敏性,成功用于实际水样中辛基酚的检测,回收率为96.0%~104.0%。

A novel magnetic imprinted electrochemical sensor was prepared based on magnetic graphene modified carbon electrode with 4-octylphenol （4-OP） as the template molecule and dopamine as the functional monomer. The morphology of the imprinted sensor based on magnetic graphene was characterized with scanning electron microscopy. The electrochemical performances of the molecularly imprinted sensor were characterized with cyclic voltammetry and differential pulse voltammetry （DPV）. The results showed that the imprinted electrochemical sensor had special recognition ability toward 4-OP. The magnetic imprinted electrochemical sensor performance was optimized by using DPV method. The results showed that the response current of the imprinted electrochemical sensor revealed a linear relationship with the negative logarithm of 4-OP concentrations range of 5. 0 ×10-6 -5. 0 ×10-9 mol/ L with the detection limit of 3. 64 ×10-10 mol/ L （S / N=3）. The molecularly imprinted electrochemical sensor was successfully used to detect 4-OP in water samples with the recoveries of 96. 0% -104. 0% .