基于ZIF-8/Au@f-CNF增敏型双酚A电化学传感器的构建及性能研究

Construction and performance of ZIF-8/Au@f-CNF sensitized electrochemical sensor for bisphenol A detection

中文关键词:  双酚A  电化学传感器  ZIF-8  碳纳米纤维  金纳米粒子

英文关键词:bisphenol A  electrochemical sensor  zeolitic imidazolate framework-8  carbon nanofibers  gold nanoparticles

中文摘要:

      目的 设计制备了金属有机框架沸石咪唑酸盐骨架-8 (zeolitic imidazolate framework-8, ZIF-8)掺杂、负载金纳米粒子的碳纳米纤维复合材料(ZIF-8-doped gold nanoparticles-loaded carbon nanofibers, ZIF-8/Au@f-CNF), 用于玻碳电极(glassy carbon electrode, GCE)表面功能化修饰, 以构建食品中双酚A污染物的增敏型电化学传感器, 并探索对双酚A的增敏检测机制。方法 将利用室温溶剂法制备的ZIF-8与原位还原法制备的负载金纳米粒子的碳纳米纤维(gold nanoparticles-loaded carbon nanofibers, Au@f-CNF)超声混合, 滴注在GCE电极表面, 构建ZIF-8/Au@f-CNF电化学传感器。运用X-射线光电子能谱仪和透射电子显微镜、循环伏安法和电化学阻抗法对材料表面形貌和电化学性能进行表征, 考察了扫描速度和pH等参数对双酚A电化学传感行为的影响。结果 ZIF-8/Au@f-CNF复合材料显示较为均匀的掺杂状态, 经ZIF-8/Au@f-CN修饰后的GCE电极(ZIF-8/Au@f-CNF/GCE)电活性面积明显提升, 是未经修饰裸GCE面积的1.62倍, 对双酚A的氧化峰电流峰值显著提升至原来的2.18倍。结论 将ZIF-8的多孔特性和Au@f-CNF的电催化性能相结合, 赋予ZIF-8/Au@f-CNF/GCE对目标物良好的吸附性能和电化学反应活性, 基于纳米材料的协同效应可实现对双酚A的增敏传感检测, 该研究为新型复合材料的开发及增敏传感器构建提供了研究思路和方法借鉴。

英文摘要:

      Objective To design and prepare metal-organic framework zeolitic imidazolate framework-8 (ZIF-8)-doped gold nanoparticles-loaded carbon nanofibers (ZIF-8/Au@f-CNF) and modifie on glass carbon electrode (GCE) to construct sensitized electrochemical sensing of bisphenol A contaminants in food, and explore the sensitization detection mechanism of bisphenol A. Methods ZIF-8 was prepared by room-temperature solvent method, then ultrasonically mixed with gold nanoparticles-loaded carbon nanofibers (Au@f-CNF) obtained from in-situ reduction process, and the resultant ZIF-8/Au@f-CNF was directly dropped on the electrode surface to construct ZIF-8/Au@f-CN modified electrochemical sensor. The X-ray photoelectron spectroscopy, transmission electron microscopy, cyclic voltammetry and electrochemical impedance spectroscopy were employed to observe their surface morphology, elementary composition and the electrochemical performance. In addition, the influencing factors such as scan speed and pH which could affect the sensing behavior for BPA were also investigated. Results The ZIF-8/Au@f-CNF composite showed relatively uniform doping state. After modification, the electroactive area of ZIF-8/Au@f-CN/GCE had been obviously improved to 1.62 times that of the bare GCE, and the peak current for bisphenol A significantly increased to 2.18 times that of the original GCE. Conclusion The combination of porous property of ZIF-8 and the electrocatalytic characteristic of Au@f-CNF endows the ZIF-8/Au@f-CNF/GCE with excellent absorption and electrochemical reactivity for target analyte. Based on the synergistic effect of nanomaterials, the sensitized electrochemical sensing for BPA is realized on the ZIF-8/Au@f-CNF sensors, which provides the research ideas and methods for the development of novel composite materials and the construction of sensitized sensors.