Complexation Studies of Eu(III) with Alumina-Bound Polymaleic Acid: Effect of Organic Polymer Loading and Metal Ion Concentration

Citations Over TimeTop 15% of 2002 papers

Abstract

To contribute to the comprehension of the metal ion sorption properties in mixed mineral-organic matter systems, interaction studies between Eu(III) and polymaleic acid (PMA)-coated alumina colloids were carried out at pH 5 in 0.1 M NaClO4. The studied parameters were the metal ion concentration (1 x 10(-10) to 1 x 10(-4) M) and PMA loading on alumina (gamma = 10-70 mg/g). The data were described by a surface complexation model. The constant capacitance model was used to account for electrostatic interactions. The results showed thattwo sites were necessary to explain the sorption data. At high Eu loading, Eu is surrounded by one carboxylate group and one aluminol group. The existence of this ternary surface site was in agreement with time-resolved laser-induced fluorescence spectroscopy measurements. At low metal ion concentrations, a surface site corresponding to a 1:1 Eu/COO-stoichiometry was deduced from modeling. Spectroscopic data did not corroborate the existence of this latter site. This discrepancy was explained by postadsorption kinetic phenomenon: a migration of the metal ion within the adsorbed organic layer.

Related Papers

• → Co-sorption of ofloxacin and Cu(II) in soils before and after organic matter removal(2014)42 cited
• [Sorption behaviors of BDE-28 on natural soils].(2011)
• Adsorption properties of magnetic chitosan nanoparticle for humic acid and heavy metal ions(2012)
• THE INFLUENCE OF CONTAINER WALL SORPTION ON SORPTION RATIO OF ￣(241)AM(1994)
• Sorption Characteristics of BDE-47 on Natural Soils(2011)