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Type: Artigo de periódico
Title: Synthesized cellulose/succinic anhydride as an ion exchanger. Calorimetry of divalent cations in aqueous suspension
Author: Melo, JCP
Silva, EC
Santana, SAA
Airoldi, C
Abstract: A synthetic route to a biopolymer/anhydride ion exchanger adds cellulose directly to molten succinic anhydride in a quasi solvent-free procedure. An amount of 3.07 +/- 0.05 mmol of pendant groups incorporated onto the polymeric structure, which was characterized by elemental analysis, solid state carbon NMR, infrared, X-ray and thermogravimetry. The new polysaccharide is able to exchange cations from aqueous solution through a batchwise methodology, to obtain 2.46 +/- 0.09 mmol g(-1) for divalent cobalt and nickel cations. The net thermal effects obtained from calorimetric titrations gave endothermic values of 3.81 +/- 0.02 and 2.35 +/- 0.01 kJ mol(-1). The spontaneity of this ion-exchange process reflected in negative Gibbs energies and also a positive entropic contribution. These thermodynamic data at the solid/liquid interface suggests a favorable ion exchange process for this anchored biopolymer, for cation removal from the environment. (C) 2011 Elsevier B.V. All rights reserved.
Subject: Cellulose
Succinic anhydride
Ion exchange
Country: Holanda
Editor: Elsevier Science Bv
Citation: Thermochimica Acta. Elsevier Science Bv, v. 524, n. 41671, n. 29, n. 34, 2011.
Rights: fechado
Identifier DOI: 10.1016/j.tca.2011.06.007
Date Issue: 2011
Appears in Collections:Unicamp - Artigos e Outros Documentos

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