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BIBTEX RIS

Estudo Termodinâmico da Adsorção de Zinco em Argila Bentonita Bofe Calcinada

2009; Associação Sergipana de Ciências; Volume: 5; Issue: 12 Linguagem: Inglês

ISSN

1808-2793

Autores

A. L. P. Araujo, Milenna Costa Silva, Marcelino Luiz Gimenes, Maria Angélica Simões Dornellas de Barros,

Tópico(s)

Adsorption and biosorption for pollutant removal

Resumo

In this work, was evaluated the behavior of the adsorption of ions of zinc present in aqueous solution, in clay bentonita Bofe as a function of the temperature and of the concentration of the ion in the solution through the isotherms of adsorption and of your thermodynamic parameters. The parameters thermodynamic entropy variation (ΔS), entalpia variation (ΔH) and variation of the energy free from Gibbs (ΔG), they were calculated by the graph ln(Kd) versus 1/T. The isotherms of adsorption were obtained with the experimental data of balance. The models of Langmuir and Freundlich were adjusted to the experimental data and the first presented the best results. The thermodynamic tests were accomplished in the temperatures of 0, 25, 50 and 75 0C and it was verified that the process of adsorption is spontaneous and exotermico.

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