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|Type:||Artigo de periódico|
|Title:||Adsorption of arsenic(V) into modified lamellar Kenyaite|
|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.|
|Editor:||Elsevier Science Bv|
|Appears in Collections:||Artigos e Materiais de Revistas Científicas - Unicamp|
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