Graduate Institute of Organic and Polymeric Materials, National Taipei University of Technology, Taipei, Taiwan (Republic of China).
Department of Molecular Science and Engineering, National Taipei University of Technology, Taipei, Taiwan (Republic of China).
Mikrochim Acta. 2020 Oct 31;187(11):633. doi: 10.1007/s00604-020-04613-z.
The effect of annealing temperature variance on magnesium ferrites (MgFeO) later anchored on reduced graphene oxide (rGO) forming hybrid nanocomposite is demonstrated and its electrochemical performance investigated by using a screen-printed carbon paste electrode (SPCE) for detection of the environmental hazardous phenolic compound 4-cyanophenol (4-CY). The MgFeO (MFO-600 °C) displayed an enhanced charge transfer ratio with high conductivity and electrocatalytic activity. To confirm the structural and morphological parameters of the rGO-MFO-2 hybrid micro/nanocomposite, X-ray diffraction (XRD), Raman spectroscopy, X-ray photoelectron microscopy (XPS), and field-emission electron microscopy (FE-EM) with EDX mapping have been utilized. The rGO/MFO-2/SPCE electrode displayed high catalytic performance in detecting 4-CY with good sensitivity of 6.836 μA μM cm in a working range 0.001 to 700 μM with a limit of detection of 0.0012 μM by using differential pulse voltammetry (DPV). This is achieved for the active interaction between rGO and MFO-2 active surface site areas resulting in good electrochemical activity and high electron transfer rate. Moreover, 4-CY detection has been performed in the presence of various interferents and through real-time analysis in samples like tap water, industrial river water, and fish which resulted in admirable recovery.Graphical abstract.
退火温度变化对镁铁氧体（MgFeO）的影响，随后锚定在还原氧化石墨烯（rGO）上形成混合纳米复合材料，并通过使用丝网印刷碳糊电极（SPCE）检测环境有害的酚类化合物 4-氰苯酚（4-CY）来研究其电化学性能。MgFeO（MFO-600°C）表现出增强的电荷转移比、高导电性和电催化活性。为了确认 rGO-MFO-2 混合微/纳米复合材料的结构和形态参数，利用 X 射线衍射（XRD）、拉曼光谱、X 射线光电子能谱（XPS）和场发射电子显微镜（FE-EM）结合 EDX 映射进行了分析。rGO/MFO-2/SPCE 电极在检测 4-CY 方面表现出高催化性能，在工作范围内 0.001 至 700 μM 时具有良好的灵敏度 6.836 μA μM cm，差分脉冲伏安法（DPV）的检测限为 0.0012 μM。这是由于 rGO 和 MFO-2 活性表面区域之间的积极相互作用，导致良好的电化学活性和高电子转移率。此外，在存在各种干扰物的情况下进行了 4-CY 检测，并通过实时分析自来水、工业河水和鱼类等样品进行了实时分析，结果令人满意。
