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Efficient electrochemical detection of hazardous para-nitrophenol based on a carbon paste electrode modified with green synthesized gold/iron oxide nanocomposite

Aisha A. Ganash and Rahmah A. Aljubairy

Chemistry Department, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia



Received: 24 November 2021  Accepted: 16 January 2022


In this study, a Au-Fe3O4 nanocomposite-coated carbon paste electrode was developed as a simple, inexpensive, and efficient sensor for the removal and detection of para nitrophenol in acetate buffer solution (pH = 4.5). The Au-Fe3O4 nanocomposite was green synthesized using Hyssopus Officinalis-L extract solution, and the fabricated nanocomposite was characterized by SEM, EDX, XRD, FTIR, UV–vis, and TEM analysis. The limit of detection (0.023 μM) in the concentration range (3–50 μM) was calculated at the optimum condition. The CPE/Au-Fe3O4 nanocomposite electrode shows high selectivity, stability, and reproducibility with acceptable recovery (96–112%). Furthermore, the CPE/Au-Fe3O4 nanocomposite electrode shows excellent catalytic activity for the reduction in para nitrophenol with a rate constant (k) of 0.01 min−1 and correlation coefficient R2 of 0.999.

Graphical abstract

Keywords: Au-Fe3O4 nanocomposite; Green synthesis; Para nitrophenol; Catalytic activity

Full paper is available at

DOI: 10.1007/s11696-022-02094-3


Chemical Papers 76 (5) 3169–3183 (2022)

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