Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/78156
Type: Artigo de periódico
Title: The modified clay performance in adsorption process of Pb2+ ions from aqueous phase - Thermodynamic study
Author: Guerra, DL
Lemos, VP
Angelica, RS
Airoldi, C
Abstract: Smectite clay sample from Acre state, Amazon region, Brazil, was used for pillaring and organofunctionalization process in the present study. The pillaring ions were obtained through chemical reaction of AlCl3 center dot 6H(2)O/NaOH, Ti(OC2H5)(4)/HCl, Cr-3(OH)(4)(4+)/NaOH and ZrOCl2 center dot 8H(2)O solutions. The resulting materials were organofunctionalized with 3-Aminopropyltriethoxysilane (APS). The adsorption capacity was investigated with Pb2+, ions from aqueous solution in pH 5.0 and controlled temperature 298 +/- 0.20 K. The Langmuir, Freundlich and Temkin adsorption isotherms models have been applied to fit the experimental data, linear regression. The energetic effect caused by metal cation adsorption was determined through calorimetric titration at the solid-liquid interface and gave a net thermal effect that enabled the calculation of the exothermic values and the equilibrium constant. (C) 2008 Published by Elsevier B.V.
Subject: pillared clay
smectite lead
calorimetry
thermodynamic
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.colsurfa.2008.02.024
Date Issue: 2008
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

Files in This Item:
File Description SizeFormat 
WOS000257129300013.pdf917.72 kBAdobe PDFView/Open


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.