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Type: Artigo de periódico
Title: Kinetic and thermodynamic uranyl (II) adsorption process into modified Na-Magadiite and Na-Kanemite
Author: Guerra, DL
Pinto, AA
de Souza, JA
Airoldi, C
Viana, RR
Abstract: The compound 2-mercaptopyrimidine (MPY) was attached onto synthetic Na-Magadiite (M) and Na-Kanemite (K) samples by homogeneous route. The final matrices named M(MPY) and K(MPY) have been characterized through X-ray powder diffraction and scanning electron microscopy (SEM). The resulted materials were submitted to process of adsorption with uranyl solution at pH 2.0 and 298 +/- 1 K. The kinetic parameters were analyzed by the Lagergren and Elovich models of adsorption and demonstrated to be good fit for all experiments. From calorimetric determinations the quantitative thermal effects for uranyl(II)/basic center interactions gave exothermic enthalpy, negative Gibbs free energy, and positive entropy. These thermodynamic data confirmed the energetically favorable condition of such interactions at the solid/liquid interface for all systems. (C) 2008 Published by Elsevier B.V.
Subject: Na-Magadiite
Country: Holanda
Editor: Elsevier Science Bv
Citation: Journal Of Hazardous Materials. Elsevier Science Bv, v. 166, n. 41700, n. 1550, n. 1555, 2009.
Rights: fechado
Identifier DOI: 10.1016/j.jhazmat.2008.12.032
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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