Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/69910
Type: Artigo de periódico
Title: Immobilization of 5-amino-1,3,4-thiadiazole-thiol onto kanemite for thorium(IV) removal: Thermodynamics and equilibrium study (Retracted article. See vol. 357, pg. 558, 2011)
Author: Guerra, DL
Carvalho, MA
Leidens, VL
Pinto, AA
Viana, RR
Airoldi, C
Abstract: The compound 5-amino-1,3,4-thiadiazole-thiol (ATT) was anchored onto an Amazon kanemite surface (K) by homogeneous and heterogeneous routes. Both kanemite modification methodologies resulted in similar products, named K(CTT) and K(ATT), respectively. The modified and natural kanemite samples were characterized by textural analysis. FT-Raman, and nuclear magnetic nuclei of (29)Si and (13)C. Elemental analysis proved that the matrix K(ATT) presented a higher ATT immobilization than K(CTT), with values 1.42 and 1.38 mmol g(-1), respectively. NMR and FT-Raman confirmed the immobilization of ATT on both surfaces. The ability of these materials to remove thorium(IV) from aqueous solution was followed by a series of adsorption isotherms adjusted to a Sips equation at room temperature and pH 4.0. The maximum number of moles adsorbed was determined to be 7.48 x 10(-3), 9.82 x 10(-3), and 12.94 x 10(-3) mmol g(-1) for K, K(CTT), and K(ATT), respectively. The energetic effects (Delta(int)H degrees, Delta(int)G degrees, and Delta(int)S degrees) caused by metal cation adsorption were determined through calorimetric titrations. (C) 2009 Published by Elsevier Inc.
Subject: Kanemite
Thorium
Adsorption
Calorimetry
Thermodynamic
Country: EUA
Editor: Academic Press Inc Elsevier Science
Rights: fechado
Identifier DOI: 10.1016/j.jcis.2009.06.004
Date Issue: 2009
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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