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

Abstract

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 composites 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) activation 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 activation energy, Ea = 30.93 kJ/mol suggested the dependency of reaction rate on temperature significantly.