Preparation and Characterization of Some Esters Impregnated with Magnetic Iron Oxide Nanoparticles Fe3O4 and Study of Their Efficiency in for Adsorption of Lead Ions from Their Aqueous Solutions

Abstract

Lead is a naturally occurring toxic metal found in the earth's crust. Its widespread use has resulted in extensive environmental contamination, human exposure and significant public health problems in many parts of the world. In this study we report the preparation of three esters impregnated with magnetic nanoparticles Fe₃O₄, esters prepared from 2,2-bis(hydroxyl methyl)propane-1,3-diol with 4-hydroxy benzoic acid (I), nicotinic acid (niacin) (II) and stearic acid (III). The synthesis absorbents (I@Fe₃O₄, II@Fe₃O₄ and III@Fe₃O₄) proved to be effective for the removal of lead ions from aqueous solution at near-neutral pH, the adsorption behavior was matching with Langmuir model for I@Fe₃O₄ and II@Fe₃O₄ and in keeping with Freundlich model for III@Fe₃O₄ with q_max values of 862.068 mg/g, 1149.425 mg/g and 261.096 mg/g respectively. The adsorption of  Pb(II) follows pseudo-first-order kinetics for three adsorbents.