Bioinorganic Chemistry and Applications

Bioinorganic Chemistry and Applications / 2005 / Article
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7th International Symposium on Applied Bioinorganic Chemistry Guanajuato, Mexico, April 2003

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Volume 3 |Article ID 531925 | https://doi.org/10.1155/BCA.2005.55

Jaime Romero-González, Jorge L. Gardea-Torresdey, José R. Peralta-Videa, Elena Rodríguez, "Determination of Equilibrium and Kinetic Parameters of the Adsorption of Cr(III) and Cr(VI) from Aqueous Solutions to Agave Lechuguilla Biomass", Bioinorganic Chemistry and Applications, vol. 3, Article ID 531925, 14 pages, 2005. https://doi.org/10.1155/BCA.2005.55

Determination of Equilibrium and Kinetic Parameters of the Adsorption of Cr(III) and Cr(VI) from Aqueous Solutions to Agave Lechuguilla Biomass

Abstract

This investigation reveals the capability of Agave lechuguilla for trivalent and hexavalent chromium removal from aqueous solutions. Experimentation included pH profile, time dependence, adsorption capacity (KF and QL), adsorption intensity (n and RL) and saturation capacity (qs) studies. Batch experiments were conducted at 22°C to characterize and model the adsorption equilibrium as well as biomass adsorption rates. pH 4 was the optimum for Cr(III) binding, while Cr(VI) optimum binding was at pH 2. Time profile experiments indicated that the adsorption of Cr(VI) by lechuguilla biomass was time-dependent and that of Cr(III) was not. Kinetic models demonstrated that a pseudo-second order reaction model best described the kinetic data for Cr(VI). The adsorption isotherms showed that the binding pattern for Cr(VI) followed the Freundlich isotherm model, while that for Cr(III) followed the Langmuir isotherm.

Copyright © 2005 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


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