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Please use this identifier to cite or link to this item: http://repositorio.ufba.br/ri/handle/ri/4879

Title: Characterization and determination of the thermodynamic and kinetic properties of the adsorption of the molybdenum(VI)–calmagite complex onto active carbon
Other Titles: Journal of Colloid and Interface Science
Authors: Ferreira, Sergio Luis Costa
Andrade, Heloysa Martins Carvalho
Talma, Hilda Costa dos Santos
Issue Date: 2004
Abstract: The extraction of the Mo(VI)–calmagite complex by adsorption onto active carbon is investigated in the present paper. Thermodynamic and kinetic properties and different adsorption isotherms were determined. The adsorption studies have shown that both the empirical Freundlich and the classical Langmuir isotherms successfully fit the experimental results. The overall adsorption process was exothermic and spontaneous in the temperature range from 283 to 323 K; namely, _H0 and _S0 values were found to be −8.15 kJ mol−1 and −3.86 Jmol−1 K, respectively. The high activation energy demanded for desorption of the Mo(VI)–calmagite complex surface indicated that the overall process was controlled by the slow desorption, while a fast and low activated adsorption of the complex onto active carbon surface was fairly favored. These features indicate that active carbon may be very useful for preconcentration of molybdenum from diluted solutions.
Description: p.276–280
URI: http://www.repositorio.ufba.br/ri/handle/ri/4879
ISSN: 0021-9797
Appears in Collections:Artigos Publicados em Periódicos (Quimica)

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