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Sorption of aspartic and glutamic aminoacids on calcined hydrotalcite

Fabiano Silvério1, Márcio José dos Reis12*, Jairo Tronto1 and João Barros Valim1

Author Affiliations

1 Departamento de Química - Faculdade de Filosofia Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Av. Bandeirantes, 3900, CEP 14040-901, Ribeirão Preto, Brazil

2 Present Address: Universidade de Franca, Av. Dr. Armando Salles Oliveira, 201, Parque Universitário, CEP14404-600, Franca, SP, Brazil

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SpringerPlus 2013, 2:211  doi:10.1186/2193-1801-2-211

Published: 8 May 2013

Abstract

Sorption of aspartic and glutamic aminoacids by regeneration of calcined hydrotalcite is reported. Hydrotalcite was synthesized by coprecipitation and calcined at 773 K. Sorption experiments were performed at 298 K and 310 K, and the results reveal that at low aminoacids equilibrium concentrations, intercalation of hydroxyl anions takes place while at high equilibrium concentrations, the sorption process occur by means re-hydration and aminoacids intercalation of hydrotalcite. The results also suggested that Asp and Glu sorption is a temperature dependent process. The amount of sorbed amino acid decreases as the temperature increase. The effect is more pronounced for Glu sorption probably due to its higher hydrophobic character, which makes the sorption more difficult in comparison with sorption of Asp at higher temperature.

Keywords:
Hydrotalcite; Layered double hydroxides; Aminoacids; Adsorption; Sorption