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|Type:||Artigo de periódico|
|Title:||Adsorption Of Arsenic(iii) Into Modified Lamellar Na-magadiite In Aqueous Medium-thermodynamic Of Adsorption Process|
|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.|
|Appears in Collections:||Unicamp - Artigos e Outros Documentos|
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