MG@ZIF7-MIP的制备及对水环境中双酚A的电化学传感检测

Preparation of MG@ZIF7-MIP and electrochemical sensing detection of bisphenol A in aqueous environment

为了解决常规双酚A检测分析方法无选择性、需要标准样品、预处理过程复杂等缺陷,以磁性石墨烯(MG)为基底、ZnO作为Zn源在MG表面原位生长ZIF-7,合成了高效导电复合膜MG@ZIF-7;选择MG@ZIF-7为载体、内分泌干扰物双酚A(BPA)为模板分子、丙烯酰为功能单体、二乙烯基苯为交联剂,采用表面分子印迹技术成功制备了分子印迹杂化膜(MG@ZIF7-MIP),并通过TEM、XRD、XPS、FT-IR等测试手段对其进行了分析表征;构建了以MG@ZIF7-MIP修饰电极为工作电极的分子印迹电化学传感器,对水环境中内分泌干扰物BPA进行选择性检测。结果表明:MG@ZIF7-MIP修饰电极对BPA的线性响应范围为0.001~0.100μmol/L(R=0.9763),响应平衡时间为4 min,检测限为9.84 ng/L(S/N=3),建立了一种快速响应、实用性强、高灵敏检测双酚A的分析方法。

In order to solve the defects of conventional BPA detection methods such as no selectivity,the need for standard samples and complicated pretreatment process,a highly efficient conductive composite film MG@ZIF-7 was synthesized by growing ZIF-7 in situ on the surface of MG with magnetic graphene(MG)as the substrate and ZnO as the Zn source.MG@ZIF-7 was selected as the carrier,endocrine disruptor bisphenol A(BPA)as the template molecule,acryloyl as the functional monomer and divinylbenzene as the cross-linker,and the molecularly imprinted hybrid membrane(MG@ZIF7-MIP)was successfully prepared by surface molecular imprinting technique,which was analytically characterized by TEM,XRD,XPS,FT-IR and other testing methods.And a molecularly imprinted electrochemical sensor with MG@ZIF7-MIP modified electrode as the working electrode was constructed for the selective detection of endocrine disruptor BPA in aqueous environment.The results showed that the linear response range of MG@ZIF7-MIP modified electrode for BPA was 0.001-0.100μmol/L(R=0.9763),the response equilibrium time was 4 min,and the detection limit was 9.84 ng/L(S/N=3),a rapid response,pra-ctical and highly sensitive analytical method for the detection of BPA was developed.