title: Sorption of aspartic and glutamic aminoacids on calcined hydrotalcite.
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.
authors.affiliation: 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.
authors.forename: Fabiano
authors.initials: F
authors.lastname: Silvério
authors.forename: Márcio José
authors.initials: MJ
authors.lastname: Dos Reis
authors.forename: Jairo
authors.initials: J
authors.lastname: Tronto
authors.forename: João Barros
authors.initials: JB
authors.lastname: Valim
keywords: Adsorption; Aminoacids; Hydrotalcite; Layered double hydroxides; Sorption