Abstract
In this report, the kinetic and equilibrium isotherm modeling for removal of malachite green dye with Fe3O4@SiO2-CPTS magnetic nanoparticles in aqueous solutions were investigated. The equilibrium adsorption data were fitted with Langmuir, Freundlich, Redlich-Peterson, Temkin and Dubinin-Radushkevich isotherm models. The adsorption equilibrium data fitted very well to Redlich-Peterson (D-R) isotherm models that predict accurately the adsorption experimental data on solid adsorbents in comparison to other models. Moreover, the adsorption kinetics data were fitted with the pseudo-second order model. Characterization of Fe3O4@SiO2-CPTS Magnetic nanoparticles was carried out by using scanning electron microscopy (SEM) and Fourier transform-infrared spectroscopy (FT-IR). The recovery tests were carried out to evaluate the reliability of the NPs for the adsorption and desorption of malachite green dye that showed excellent recoveries in both water solution at pH = 4 (recovery=95%).
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