Abstract
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 mu M) in the concentration range (3-50 mu M) 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 R-2 of 0.999.
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