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

The role of nanomaterials as effective adsorbents and their applications in wastewater treatment

“…Depending upon the surface functionality (COOH, NH 2 or SH), these magnetic nanoadsorbents capture metal ions either by forming chelate complexes, by ion exchange process or else through electrostatic interaction. It has been reported that these surface-engineered Fe 3 O 4 nanoparticles have a strong affinity for the simultaneous adsorption of [45,47,48,51,68,118,[123][124][125][126]. In addition, the adsorption process was found to be highly dependent on the amount, surface functionality and pH of the medium, which caused these nanoparticles to selectively adsorb metal ions [125][126][127].…”

“…Many reports discussed the influence of different parameters on the removal of metal ions by Fe 3 O 4 magnetic nanoparticles [47,123]. For example, the adsorption efficiency of Ni(II), Cu(II), Cd(II) and Cr(VI) ions by Fe 3 O 4 nanoparticles was strongly dependent on pH, temperature, amount of the adsorbent and the incubation time [124][125][126][127]. Further, a higher removal efficiency of these metal ions at a 3.5 mg mL [124][125][126][127].…”

“…For example, the adsorption efficiency of Ni(II), Cu(II), Cd(II) and Cr(VI) ions by Fe 3 O 4 nanoparticles was strongly dependent on pH, temperature, amount of the adsorbent and the incubation time [124][125][126][127]. Further, a higher removal efficiency of these metal ions at a 3.5 mg mL [124][125][126][127]. Singh et al [46] reported the removal of toxic metal ions from wastewater using carboxyl-, amine-and thiol-functionalized Fe 3 O 4 nanoparticles (succinic acid, ethylenediamine and 2,3-dimercaptosuccinic acid, respectively).…”

“…It has been reported that these surface-engineered Fe 3 O 4 nanoparticles have a strong affinity for the simultaneous adsorption of [45,47,48,51,68,118,[123][124][125][126]. In addition, the adsorption process was found to be highly dependent on the amount, surface functionality and pH of the medium, which caused these nanoparticles to selectively adsorb metal ions [125][126][127]. An almost 100% removal rate of Cr(III), Co(II), Ni(II), Cu(II), Cd(II) and Pb(II) ions from water was reported at pH [ 8 by these functionalized nanoparticles [124][125][126][127].…”

Preparation of amino-Fe(III) functionalized mesoporous silica for synergistic adsorption of tetracycline and copper

“…Among these methods, adsorption remains attractive because of its advantages of easy operation, energy savings and high removal capacity. Many adsorbents have been used to adsorb antibiotics or heavy metals from water separately, but fewer were used to remove them together (Figueroa et al, 2004;Ge et al, 2012;Ji et al, 2009;Oh et al, 2007;Sassman and Lee, 2005;Vu et al, 2010;Yang and Jiang, 2014;Hasan et al, 2013). In recent years, the cosorption of antibiotics and heavy metals from water by some adsorbents has been attracting increasing concern due to the realistic demands (Kang et al, 2010;Ling et al, 2013;Wang et al, 2008).…”