Abstract
The use of cheap and eco-friendly adsorbents prepared from abundantly available pomegranate peel (Pomegranate activated carbons, PAC) and Banana peel (Banana activated carbons, BAC) compared with Commercial activated carbons (ACs) were used for the removal of an insecticide and nematicide oxamyl from aqueous solutions. The ACs were characterized by Fourier transform infrared spectroscopy, Scanning electron microscope, Transmission electron microscopy, and energy dispersive. The effects of initial pesticide concentration and contact time on the biosorption of oxamyl onto the three different adsorbents were investigated. The equilibrium data of kinetic studies were attained at 180 min. The experimental results show increasing adsorption of adsorbents with increasing oxamyl concentrations. The experimental isotherms data were analyzed using Freundlich, Temkin, and Dubinin–Radushkevich isotherm equations. The best experimental data were obtained for all adsorbents by the Freundlich isotherm model with high correlation coefficients (R2 ≥ 0.9699). The results suggest that the oxamyl adsorption onto PAC, BAC, and Commercial AC is physical. Kinetic studies indicated that the pseudo-second-order fitted well to the experimental data. The results revealed that two adsorbents can be used as low-cost biosorbents for the oxamyl removal from aqueous solution.
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