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Effective removal of heavy metal ions Cd²⁺, Zn²⁺, Pb²⁺, Cu²⁺ from aqueous solution by polymer-modified magnetic nanoparticles

Ge, Fei, Li, Meng-Meng, Ye, Hui, Zhao, Bao-Xiang
Journal of hazardous materials 2012 v.211-212 pp. 366-372
X-ray diffraction, acrylic acid, adsorbents, adsorption, aqueous solutions, cadmium, composite polymers, copper, desorption, electrolytes, heavy metals, ion transport, iron oxides, lead, metal ions, nanoparticles, pH, sorption isotherms, thermodynamics, thermogravimetry, transmission electron microscopy, zinc
We prepared novel Fe₃O₄ magnetic nanoparticles (MNPs) modified with 3-aminopropyltriethoxysilane (APS) and copolymers of acrylic acid (AA) and crotonic acid (CA). The MNPs were characterized by transmission electron microscopy, X-ray diffraction, infra-red spectra and thermogravimetric analysis. We explored the ability of the MNPs for removing heavy metal ions (Cd²⁺, Zn²⁺, Pb²⁺ and Cu²⁺) from aqueous solution. We investigated the adsorption capacity of Fe₃O₄@APS@AA-co-CA at different pH in solution and metal ion uptake capacity as a function of contact time and metal ion concentration. Moreover, adsorption isotherms, kinetics and thermodynamics were studied to understand the mechanism of the synthesized MNPs adsorbing metal ions. In addition, we evaluated the effect of background electrolytes on the adsorption. Furthermore, we explored desorption and reuse of MNPs. Fe₃O₄@APS@AA-co-CA MNPs are excellent for removal of heavy metal ions such as Cd²⁺, Zn²⁺, Pb²⁺ and Cu²⁺ from aqueous solution. Furthermore, the MNPs could efficiently remove the metal ions with high maximum adsorption capacity at pH 5.5 and could be used as a reusable adsorbent with convenient conditions.