基于钯水凝胶的电化学传感器选择性检测水合肼

摘要

以β-环糊精为保护剂,氯化亚钯为前驱体,采用分子自组装的方式合成钯水凝胶,利用X-射线衍射仪(XRD)、扫描电子显微镜(SEM)、透射电子显微镜(TEM)对其形貌和结构进行了表征.通过滴涂法将其修饰到金电极表面,采用循环伏安法(CV)、差分脉冲伏安法(DPV)对修饰电极的电化学行为了表征.结果表明,此传感器对水合肼具有良好的电催化效果,可有效消除K+、Na+、Mg2+、NH+4、Ni2+、Mn2+和Cl-、NO-3、SO2-4、PO3-4、HCOO-(草酸根)、C6H5O3-7 (柠檬酸根)等物质的干扰.在优化的条件下,氧化峰电流与水合肼的浓度在25~950 μmol/L范围内呈良好的线性关系,检出限为1.6 μmol/L(S/N=3).此传感器具有制作简单、灵敏度高和选择性好等优点,可应用于实际水样中水合肼的检测.%Palladium hydrogel capped by β-cyclodextrins (Pdβ-CD) was prepared by a facile method with β-cyclodextrins and palladium(II) chloride,which were then modified onto the surface of gold electrode. The morphology and structure of the as-prepared palladium hydrogel were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and transmission electron microscopy (TEM), while the electrochemistry behaviors of gold electrode modified by Pdβ-CDwere investigated by cyclic voltammetry (CV) and differential pulse voltammetry(DPV). The results indicated the sensor had high electrochemistry response to hydrazine hydrate in the presence of K+,Na+,Mg2+,NH+4,Ni+2,Mn2+,Cl-,NO-3,SO2-4,PO3-4,HCOO-, C6H5O-3. Under the optimized conditions, the oxidized peak current showed linear relationship with the concentration of hydrazine hydrate in the concentration range of 25-950 μmol/L and the limit of detection (LOD) of 1.6 μmol/L(S/N=3).Owing to the facile preparation,high sensitivity and selectivity,the sensor has potential applications in determination of hydrazine hydrate in real water samples