基于分子印迹电聚合膜的双酚A电化学传感器

以双酚A为模板分子,邻氨基苯硫酚为单体,采用自组装和电聚合方法,在电极表面制备了对双酚A有选择性的分子印迹聚合物膜.通过循环伏安法研究传感器对双酚A的响应特性.结果表明: 在6.0×10-7～5.5×10-5 mol/L浓度范围内峰电流值与浓度呈良好线性关系(r=0.991);检出限2.0×10-7 mol/L; 相对标准偏差<5%(n=9),达到稳定电流所用时间约2 min.此传感器具有良好的选择性、重现性及稳定性.通过交流阻抗技术和计时电流法表征了电极表面膜的电化学性质.将传感器初步用于实际样品的分析,获得了较满意的结果.

Electrochemical Sensor for Bisphenol A Based on Molecular Imprinting Technique and Electropolymerization Membrane

By the approach of self-assembly and electropolymerization, membrane for Bisphenol A (BPA) has been synthesized with bisphenol A as template molecule, o-aminothiophenol as functional monomer. Based on which, an electrochemical sensor was constructed and its response to BPA was evaluated by cyclic voltammetry. The peak current intensity was linear to Bisphenol A in the range of 6.0×10-7-5.5×10-5 mol/L with a detection limit of 2.0×10-7 mol/L and the RSD <5%(n=9). The response time of stable current was about 2 min. The proposed sensor exhibits good selectivity, reproducibility and stability. The AC impedance technology and chronoamperometry were employed to study the electrochemical characteristic of the membrane. The sensor was successfully applied to the determination of BPA in several samples.