Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/76864
Type: Artigo de periódico
Title: Adsorption of arsenic(V) into modified lamellar Kenyaite
Author: Guerra, DL
Airoldi, C
Viana, RR
Abstract: The synthetic Kenyaite sample was used for organofunctionalization process with N-propyldiethylenetrimethoxysilane and bis[3-(triethoxysilyl)propyl]tetrasulfide. The resulted materials were submitted to process of adsorption with arsenic solution at pH 2.0 and 298 +/- 1 K. The adsorption isotherms were adjusted using a modified Langmuir equation with regression non-linear; the net thermal effects obtained from calorimetric titration measurements were adjusted to a modified Langmuir equation. The adsorption process was exothermic (Delta(int)H = -4.08 to -5.94 kJ mol(-1)) accompanied by increase in entropy (Delta(int)S = 41.29-62.09 J K(-1) mol(-1))and Gibbs energy (Delta(int)G = -22.33 to -24.45 kJ mol(-1)). 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: Kenyaite
Intercalation reaction
Arsenic
Thermodynamic properties
Country: Holanda
Editor: Elsevier Science Bv
Rights: fechado
Identifier DOI: 10.1016/j.jhazmat.2008.06.095
Date Issue: 2009
Appears in Collections:Artigos e Materiais de Revistas Científicas - Unicamp

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