Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/105796
Type: Artigo de periódico
Title: Adsorption Of Arsenic(iii) Into Modified Lamellar Na-magadiite In Aqueous Medium-thermodynamic Of Adsorption Process
Author: Guerra D.L.
Pinto A.A.
Airoldi C.
Viana R.R.
Abstract: Synthetic Na-magadiite sample was used for organofunctionalization process with N-propyldiethylenetrimethoxysilane and bis[3-(triethoxysilyl)propyl]tetrasulfide, after expanding the interlayer distance with polar organic solvents such as dimethylsulfoxide (DMSO). 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 nonlinear; the net thermal effects obtained from calorimetric titration measurements were adjusted to a modified Langmuir equation. The adsorption process was exothermic (ΔintH=-4.15-5.98 kJ mol-1) accompanied by increase in entropy (ΔintS=41.32-62.20 J k-1 mol-1) and Gibbs energy (ΔintG=-22.44-24.56 kJ mol-1). The favorable values corroborate with the arsenic (III)/basic reactive centers interaction at the solid-liquid interface in the spontaneous process. © 2008.
Editor: 
Rights: fechado
Identifier DOI: 10.1016/j.jssc.2008.09.006
Address: http://www.scopus.com/inward/record.url?eid=2-s2.0-56349161600&partnerID=40&md5=d75e490d1873e4a799cdae9c14cb6ae3
Date Issue: 2008
Appears in Collections:Unicamp - Artigos e Outros Documentos

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