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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of 5-amino-1,3,4-thiadiazole-thiol onto kanemite for thorium(IV) removal: Thermodynamics and equilibrium study (Retracted article.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)

By DL Guerra, MA Carvalho, VL Leidens, AA Pinto, RR Viana and C Airoldi

Abstract

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)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.33813039Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP

Topics: Kanemite, Thorium, Adsorption, Calorimetry, Thermodynamic, Silica-gel Surface, Solid-state Nmr, Mesoporous Silica, Thermochemical Data, Adsorption Process, Aqueous-solutions, Ionic-strength, Metals Uptake, Contact Time, Sorption
Publisher: EUA
Year: 2015
DOI identifier: 10.1016/j.jcis.2009.06.004
OAI identifier: oai:repositorio.unicamp.br:REPOSIP/69910
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