Adsorption and kinetic behavior of Cu(II) ions from aqueous solution on DMSA functionalized magnetic nanoparticles

Abstract

In this work, magnetic nanoparticles (MNPs) synthesized by the solvothermal method and functionalized by meso-2,3-dimercaptosuccinic acid (DMSA) by ligand-exchange protocol were used as nanoadsorbents to remove Cu(II) ions from aqueous solution. The magnetic nanoadsorbents were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and vibrating sample magnetometer (VSM). The functionalized MNPs were used for removal of Cu(II) by batch adsorption technique under different influencing parameters such as contact time, adsorbent dose, initial Cu(II) concentration, and pH. The adsorption behaviour of Cu(II) on MNP-DMSA follows Pseudo-first-order kinetic model. Removal efficiency was found to decrease from 98 to 64% by increasing the Cu(II) concentration in the solution from 50 to 300 ppm. The experimental data for the adsorption of Cu(II) were found to follow the Langmuir isotherm and the maximum adsorption capacity was 25.44 mg/g.