Abstract
A novel magnetic silica composite nanoadsorbent embedded with NiFe nanoparticles was synthesized by carbonation decomposition of sodium silicate solution followed by a hydrothermal method. The structures and properties of the composite adsorbent were characterized by SEM, EDS, XRD, TG-DTA, and VSM. It was proved that NiFe magnetic nanoparticles were successfully embedded into silica nanoparticles. In addition, the effects of pH, initial Ni (II) concentration, and temperature were investigated. Both the Langmuir and Freundlich isotherm models were used to fit the experimental data. Combined with thermodynamics parameter calculation, the adsorption process preferred Freundlich model. The kinetic adsorption data could be described by pseudo-second-order reaction. Furthermore, adsorption kinetics data were analyzed by intraparticle diffusion model. The results suggest that the adsorption process was regulated by both surface and intraparticle diffusion processes.
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