In the present article, the synthesis of zeolite imidazolate framework-67/reduced graphene oxide (ZIF-67/rGO) and voltammetric determination of Rhodamine B (RhB) are demonstrated. The obtained materials were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, and nitrogen adsorption/desorption isotherms. It was found that the ZIF-67/rGO composite consists of ZIF-67 nano-particles highly dispersed on the rGO matrix and possesses a high specific surface area. Because of the synergistic effect of good conductivity of rGO and high surface area of ZIF-67, the ZIF-67/rGO—modified glassy carbon electrode exhibits good electrochemical behavior toward Rhodamine B (RhB) oxidation. The use of this electrode to quantitate RhB with differential pulse voltammetric method was successful with a broad linear range, from 0.96 to 44.07 μg.L^-1 of RhB and a low limit of detection of 1.79 μg.L^-1. The procedure was able to be applied to quantitatively determine RhB content in several food samples with an exceptional recovery rate (98-103%). The quantitative results highly agreed with that provided by high-performance liquid chromatography, revealing that this material is promising in in situ monitoring of other illegal additives in food.

中文翻译：

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ZIF-67 /还原氧化石墨烯修饰电极伏安法测定罗丹明B

在本文中，演示了咪唑类沸石骨架67 /还原氧化石墨烯（ZIF-67 / rGO）的合成和罗丹明B（RhB）的伏安测定。通过X射线衍射，扫描电子显微镜，透射电子显微镜，X射线光电子能谱和氮吸附/解吸等温线对获得的材料进行表征。已经发现ZIF-67 / rGO复合物由高度分散在rGO基质上的ZIF-67纳米颗粒组成，并具有高的比表面积。由于rGO的良好电导率和ZIF-67的高表面积的协同作用，ZIF-67 / rGO修饰的玻璃碳电极对罗丹明B（RhB）的氧化表现出良好的电化学行为。 μ G.L ^-1罗丹明B和检测的1.79的下限 μ G.L ^-1。该方法可用于定量测定几种食品样品中的RhB含量，回收率极高（98-103％）。定量结果与高效液相色谱法所提供的结果高度吻合，表明该材料有望用于食品中其他非法添加剂的现场监测。