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Type: Artigo de periódico
Title: Quantitative Treatment of Magnesium Ion Adsorption at the gamma-Al2O3-Water Interface
Author: Zimmermann, LM
Silva, AF
Medeiros, M
Bruch, J
Souza, AJ
Nome, RA
Fiedler, HD
Nome, F
Abstract: The adsorption isotherms of Mg2+ on gamma-alumina follow a typical Langmuir model, characteristic of single layer adsorption, and experimental data fitting is successfully described by a two-layer electrostatic model (DLM) on discrete sites on the surface with variable charge as a function of pH. Speciation studies indicate that Mg2+ was the major adsorbed species and the results show how chemical composition and species distribution in clay surfaces couples to solution properties such as pH and ionic strength to regulate adsorption and desorption processes in the distribution of Mg2+ species between sediment and the aqueous phase. Probably the mechanism of adsorption of Mg2+ at the gamma-alumina surface is predominantly electrostatic, with outer sphere complexation, and the Mg2+-saturated gamma-Al2O3 surface efficiently promotes hydrolysis of phosphate diesters.
Country: EUA
Editor: Amer Chemical Soc
Rights: fechado
Identifier DOI: 10.1021/jp106094y
Date Issue: 2010
Appears in Collections:Unicamp - Artigos e Outros Documentos

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