植酸镁基修饰电极的制备及其对双酚A的检测

Preparation of magnesium phytate-based modified electrode and its detection for bisphenol A

采用水热法制备了植酸基材料(PAC)和植酸镁基复合材料(PA-Mg),并用扫描电镜(SEM), X射线衍射(XRD), X射线光电子能谱(XPS)对PAC和PA-Mg进行了表征。分别采用循环伏安法(CV)和交流阻抗法(EIS)探究了2种材料的电化学性能,采用微分脉冲伏安法(DPV)探究了2种材料对双酚A(BPA)的响应。结果表明,相比PAC, PA-Mg表现出更优异的电化学性能,分别以PA-Mg和PAC为修饰材料,以玻碳电极(GCE)为基底电极构建PA-Mg/GCE和PAC/GCE。PA-Mg/GCE对BPA的响应电流值是PAC/GCE的2.2倍。PA-Mg/GCE在最佳检测条件下对BPA的线性响应范围为0.8~50μmol/L,检出限为0.1μmol/L,相关系数为0.996。将PA-Mg/GCE用于模拟废水中BPA浓度的测定,加标回收率在92.5%~101.5%之间。

Phytic acid-based materials(PAC) and magnesium phytate-based composites(PA-Mg) were prepared by hydrothermal method, and characterized by scanning electron microscopy(SEM), X-ray diffraction(XRD) and X-ray photoelectron spectroscopy(XPS). The electrochemical properties of the two materials were investigated by cyclic voltammetry(CV) and electrochemical impedance spectroscopy(EIS). The experimental results showed that the PA-Mg/GCE had a good conductivity. The differential pulse voltammetry response current of the PA-Mg/GCE for BPA were 2.2 times of that of PAC/GCE. The linear relationship of the oxidation peak current of BPA and its concentration was studied by differential pulse voltammetry in the range from 0.08 to 50.0 μmol/L with the limit of detection of 0.1 μmol/L. The PA-Mg/GCE was used to determine the concentration of BPA in simulated wastewater, and the measured recoveries ranged from 92.5% to 101.5%.