Green synthesized copper assisted iron oxide nanozyme for the efficient elimination of industrial pollutant via peroxodisulfate activation

Herein, a series of nanocomposites, CuxFe1-xO (where, x = 0.05, 0.10, 0.15 termed as CuI 1, CuI 2 and CuI 3 respectively) had been synthesized by Punica Granatum peel (PGP) extract. These compos-ites were characterized by different techniques. Formation of the nanocomposites was confirmed by Ultraviolet-visible spectroscopy (Uv-vis), Energy dispersive X-ray (EDX) and Fourier-transformed infrared spectroscopy (FTIR). The shape and average sizes of the particles were analyzed by the X-ray diffraction (XRD) technique, scanning electron microscope (SEM) and dynamic light scattering spectroscopy (DLS). The removal of organic pollutant, methylene blue dye (MB) through sodium peroxodisulfate (PDS) ac-tivation and enzyme mimicking activities were performed by the nanocomposites. As CuI 1 performed best, different controlling parameters and kinetics of the reactions were studied for CuI 1 catalyst cum nanozyme. The calculated rate constant for dye degradation by CuI 1 was found to be 0.01868 min -1 and the kinetic parameters' value for the enzyme mimicking activities was Km = 0.04878072 mM and Vmax = 2.221877 M min -1. From the thermodynamic study of the degradation process, the obtained acti-vation energy, Ea = 30.93 kJ/mol suggested the dependency of reaction rate on temperature significantly. (c) 2023 Elsevier B.V. All rights reserved.