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Type: Artigo de periódico
Title: Study of the adsorption of some amino acids by silica chemically modified with aminobenzenesulfonic and phosphate groups
Author: Kubota, LT
Gambero, A
Santos, AS
Granjeiro, JM
Abstract: Two silica gels, one modified with aminobenzenesulfonic (SABS) groups and the other with phosphate (SZP) groups, were prepared to adsorb some amino acids. Chemical analysis of the modified silica gave 0.65 mmol g(-1) aminobenzenesulfonic groups and 0.56 mmol g(-1) phosphate groups. The maximum adsorption capacities for amino acids determined by batch experiments for SABS were 1.37, 0.67, 0.76, and 0.59 mmol g(-1) for glycine, lysine, histidine, and leucine, respectively, and those for SZP were 0.75, 0.58, 0.44, and 0.75 mmol g(-1) for glycine, lysine, histidine, and leucine, respectively. The adsorption capacity of SABS was significantly affected by the solution pH, showing a higher selectivity than SZP. The materials were very stable, allowing their use several times without changes in adsorption capacity. (C) 1996 Academic Press, Inc.
Subject: modified silica
amino acid adsorption
aminobenzenesulfonic groups
Editor: Academic Press Inc Jnl-comp Subscriptions
Citation: Journal Of Colloid And Interface Science. Academic Press Inc Jnl-comp Subscriptions, v. 183, n. 2, n. 453, n. 457, 1996.
Rights: fechado
Identifier DOI: 10.1006/jcis.1996.0568
Date Issue: 1996
Appears in Collections:Unicamp - Artigos e Outros Documentos

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