Abstract
A new type of magnetic adsorbent was prepared using a simple one-step synthesis for the removal of Zn(Ⅱ) and Cd(Ⅱ) from aqueous solution. Structure characterization demonstrated that the surface of the magnetic nanoparticles (MNPs) had been modified by L-arginine. Factors that affect the adsorption of Zn(Ⅱ) and Cd(Ⅱ) onto the MNPs modified with L-arginine (MNPs-L), such as pH, ionic strength, initial concentration, contact time, temperature, and compete adsorption, were investigated. The adsorption kinetic data followed the pseudo-second-order model (PSOE) and the intra particle diffusion model (IPD). Isotherm data demonstrate that the Langmuir absorption model was the best-suited model for this research, and the calculated maximum adsorption capacities of Zn(Ⅱ) and Cd(Ⅱ) were 150.4mg/g and 120.2mg/g, respectively. Thermodynamic parameters indicated a spontaneous and endothermic adsorption process. In addition, regeneration studies suggested that MNPs-L were stable. Thus, MNPs-L could be a promising material for removing Zn(Ⅱ) and Cd(Ⅱ) from wastewater.
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