Notice of Retraction: The Adsorption Property Investigation of Tetraethylenepentamine Functionalized Nano-Fe3O4 Polymer Adsorbents on Cu(II) from Wastewater

Abstract

In this work, four novel tetraethylenepentamine (TEPA)-functionalized nano-sized magnetic polymers (TEPANMPs) adsorbents have been applied for the removal of Cu(II) from wastewater. Batch adsorption studies were carried out to evaluate the effects of pH value, initial concentration, adsorption isotherm, and adsorption kinetics etc. The adsorption of Cu(II) reached equilibrium rapidly within 90 mins. The adsorption efficiency of the TEPA-NMPs on Cu(II) was dependent on pH value, the initial Cu(II) concentration and the amount of the crosslink agent, i.e., divinylbenzen (DVB) used for the prepreation of the adsorbents. The adsorption efficiency of Cu(II) decreased with the increasing of the initial Cu(II) concentration and pH value. The adsorption data were well fitted with the Langmuir isotherm. The maximum adsorption capacity calculated from the Langmuir isotherm was 116.28 mg·g -1 at temperature of 308 K and pH of 4.0. Thermodynamic parameters like ΔH θ , ΔS θ and ΔG θ for the adsorption of Cu(II) onto the TEPA-NMPs have been estimated, which suggested that the adsorption processes of Cu(II) onto the TEPA-NMPs were endothermic and entropy favored in nature, with ΔH at 15.42 kJ·mol -1 , △S at 62.54 J·mol -1 ·K -1 .