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Type: Artigo de periódico
Title: Some thermodynamic data of the energetics of the interaction canon-piperazine immobilized on silica gel
Author: Espinola, JGP
Arakaki, LNH
de Oliveira, SF
da Fonseca, MG
Campos, JAA
Airoldi, C
Abstract: The interactions involving piperazine-functionalized silica with Cu(II), Fe(III), Cr(III), and Mo(III) chlorides in ethanolic solution were investigated by adsorption using batchwise process and determined by a calorimetric titration technique. The net thermal effects were calculated after subtracting the respective thermal effect of dilution for all systems. The sequence of the maximum retention capacity was 0.56, 0.54, 0.26, and 0.24 mmol g(-1) for Cr(III), Cu(II), Mo(III), and Fe(III), respectively. The amount of piperazine anchored on surface of silica was 0.54 mmol g(-1). The enthalpy of these processes gave the following values: -12.90+/-0.08, -67.83+/-0.09, -199.08+/-0.09, and 67+/-1.5 kJ mol(-1) following the same sequence of these mentioned metals, at 25.003 +/- 0.003 degreesC. The Gibbs free energy values are in agreement with favorable processes. (C) 2003 Elsevier Science B.V. All rights reserved.
Subject: silica gel
Country: Holanda
Editor: Elsevier Science Bv
Citation: Colloids And Surfaces A-physicochemical And Engineering Aspects. Elsevier Science Bv, v. 221, n. 41699, n. 101, n. 108, 2003.
Rights: fechado
Identifier DOI: 10.1016/S0927-7757(03)00095-5
Date Issue: 2003
Appears in Collections:Unicamp - Artigos e Outros Documentos

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