Preparation of porous carbon-nanogold electrode by one-step pyrolysis method for the determination of phenols
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O657.1

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National Natural Science Foundation of China Regional Science Fund Project (21561011), Hubei University for Nationalities Doctoral Startup Fund (MY2013B027), Biological Resources Protection and Utilization Hubei Provincial Key Laboratory Open Fund Project (PKLHB1911), Hubei Province “Double First-Class” Construction Special Fund Project, Hubei University for Nationalities Innovation and Entrepreneurship Project (X201910517115)

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    Abstract:

    Fe-based metal organic frameworks (MOF-Fe) treated by chloroauric acid were used as template to prepare MOFs-Fe porous carbon/Au nanopowders (MFPC/Au-NPs) by one-step pyrolysis method. The morphology and phase purity of the sample were characterized by scanning electron microscopy (SEM) and X-ray powder diffraction (XRD). The elements, specific surface area and pore size distribution of the composites were determined by X-ray photoelectron spectroscopy (XPS) and automatic specific surface and aperture analyzer. A modified electrode (MFPC/Au-NPs/GCE) was prepared by drop-coating method. The electrochemical behavior of catechol (CA) and hydroquinone (HQ) on this electrode were investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS). At pH=7.4, the oxidation peak currents of HQ and CA on the modified electrode showed a linear relationship with their concentration in the range of 0.4~20 μmol/L. The corresponding detection limits were 0.039 and 0.040 μmol/L. This sensor exhibits low detection limit and high sensitivity, and provides a simple and rapid method for the detection of CA and HQ.relationship at a concentration of 0.4~20 μmol/L, and the detection limits are 0.039 μmol/ L and 0.040 μmol/L. This sensor has low detection limit and high sensitivity, and provides a simple and rapid method for rapid detection of catechol and hydroquinone.

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History
  • Received:October 28,2019
  • Revised:December 27,2019
  • Adopted:December 27,2019
  • Online: March 23,2020
  • Published:
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