Kinetic modeling of the biosorption of Cd2+ ions from aqueous solutions onto Eichhornia crassipes roots using potentiometry: low-cost alternative to conventional methods

This work presents the use of potentiometric measurements for kinetic studies of biosorption of Cd2+ ions from aqueous solutions on Eichhornia crassipes roots. The open circuit potential of the Cd/Cd2+ electrode of the first kind was measured during the bioadsorption process. The amount of Cd2+ ions...

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Bibliographic Details
Published in:Química Nova 2013, Vol.36 (8), p.1227-1231
Main Authors: Martínez-Sánchez, Carolina, Torres-Rodríguez, Luz María, García de la Cruz, Ramón Fernando
Format: Article
Language:English
Subjects:
biosorption
CHEMISTRY, MULTIDISCIPLINARY
kinetics
potentiometry
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Summary:This work presents the use of potentiometric measurements for kinetic studies of biosorption of Cd2+ ions from aqueous solutions on Eichhornia crassipes roots. The open circuit potential of the Cd/Cd2+ electrode of the first kind was measured during the bioadsorption process. The amount of Cd2+ ions accumulated was determined in real time. The data were fit to different models, with the pseudo-second-order model proving to be the best in describing the data. The advantages and limitations of the methodology proposed relative to the traditional method are discussed.
ISSN:0100-4042
1678-7064
DOI:10.1590/S0100-40422013000800022