Fujian Polytechnic Normal University, Food Flexible Packaging Technology Fujian University Engineering Research Center, Fuqing, Fujian 350300, China.
Fujian Normal University, Collge of Life sciences, Fuzhou 350117, Fujian, China.
Anal Methods. 2021 Dec 9;13(47):5777-5786. doi: 10.1039/d1ay01542g.
The low conductivity of metal-organic frameworks seriously impedes their electrocatalytic performance. In this study, we prepared a fabricated sandwich structure composed of a Co-based zeolitic imidazolate framework (ZIF-67) and reduced graphene oxide (rGO) through a facile and simple one-pot hydrothermal reaction. This framework of nanocomposites, which are modified with a glassy carbon electrode, constructed a bisphenol A (BPA) electrochemical sensor for the first time. Operational parameters such as pH, electrolytes, the amount of modifiers, deposition potentials and deposition time were optimised for the sensitive detection of BPA. The performance of electrodes was evaluated by cyclic voltammetry, electrochemical impedance spectroscopy, field emission scanning electron microscopy, energy-dispersive X-ray spectroscopy, and X-ray diffraction and transmission electron microscopy. With differential pulse voltammetry, the detection concentration of BPA ranged from 0.05 μmol L to 100 μmol L. The results revealed that the hierarchical nanocomposites demonstrated better electrocatalytic performance with large electrochemically active surface areas, high sensitivity and a low limit of detection (5.2 nmol L), compared with a physical mixture of ZIF-67 and rGO at the same ratio. These impressive features originate from the synergistic effects of ZIF-67 and rGO. This study presents a new strategy using metal-organic framework composite materials for the sensitive detection of BPA.
金属有机骨架的低电导率严重阻碍了其电催化性能。在这项研究中，我们通过简便的一步水热反应制备了一种由钴基沸石咪唑骨架（ZIF-67）和还原氧化石墨烯（rGO）组成的三明治结构。这种纳米复合材料的框架首次被修饰到玻碳电极上，构建了双酚 A（BPA）电化学传感器。优化了操作参数，如 pH 值、电解质、修饰剂用量、沉积电位和沉积时间，以实现对 BPA 的灵敏检测。通过循环伏安法、电化学阻抗谱、场发射扫描电子显微镜、能谱分析、X 射线衍射和透射电子显微镜对电极性能进行了评估。采用差分脉冲伏安法，检测 BPA 的浓度范围为 0.05 μmol L 至 100 μmol L。结果表明，与相同比例的 ZIF-67 和 rGO 物理混合物相比，分层纳米复合材料具有更大的电化学活性表面积、更高的灵敏度和更低的检测限（5.2 nmol L），表现出更好的电催化性能。这些令人印象深刻的特性源于 ZIF-67 和 rGO 的协同效应。本研究提出了一种使用金属有机骨架复合材料灵敏检测 BPA 的新策略。
