Study of the Adsorption of Some Amino Acids by Silica Chemically Modified with Aminobenzenesulfonic and Phosphate Groups

Study of the Adsorption of Some Amino Acids by Silica Chemically Modified with... 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Colloid and Interface Science Elsevier

Study of the Adsorption of Some Amino Acids by Silica Chemically Modified with Aminobenzenesulfonic and Phosphate Groups

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Publisher
Elsevier
Copyright
Copyright © 1996 Academic Press
ISSN
0021-9797
eISSN
1095-7103
D.O.I.
10.1006/jcis.1996.0568
Publisher site
See Article on Publisher Site

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.

Journal

Journal of Colloid and Interface ScienceElsevier

Published: Nov 10, 1996

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