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Type: Artigo de periódico
Title: Layer Silicates Modified With 1,4-bis(3-aminopropyl)piperazine For The Removal Of Th(iv), U(vi) And Eu(iii) From Aqueous Media.
Author: Guerra, Denis L
Pinto, Alane A
Viana, Rúbia R
Airoldi, Claudio
Abstract: Natural montmorillonite (M) and synthetic kanemite (K) have been functionalized with 1,4-bis(3-aminopropyl)piperazine reacted with methylacrylate to yield new inorganic-organic chelating materials. The original and modified materials were characterized by X-ray diffractometry, textural analysis, SEM and nuclear magnetic nuclei of carbon-13 and silicon-29. The chemically modified clay samples (M-APPMA and K-APPMA) showed modification of its physical-chemical properties including: specific area 45.0m(2)g(-1) (M) to 978.8 m(2)g(-1) (M-APPMA) and 23.5m(2)g(-1) (K) to 898.9 m(2)g(-1) (K-APPMA). The ability of these materials to remove thorium(IV), uranyl(VI) and europium(III) from aqueous solution was followed by a series of adsorption isotherms, which were fitted to non-linear Sips adsorption isotherm model. To achieve the best adsorption conditions the influence of pH and variation of metal concentration were investigated. The energetic effects (Delta(int)H degrees , Delta(int)G degrees and Delta(int)S degrees ) caused by metal ions adsorption were determined through calorimetric titrations.
Subject: Adsorption
Hydrogen-ion Concentration
Magnetic Resonance Spectroscopy
Microscopy, Electron, Scanning
X-ray Diffraction
Citation: Journal Of Hazardous Materials. v. 171, n. 1-3, p. 514-23, 2009-Nov.
Rights: fechado
Identifier DOI: 10.1016/j.jhazmat.2009.06.032
Date Issue: 2009
Appears in Collections:Unicamp - Artigos e Outros Documentos

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