Kinetic modeling of the biosorption of Cd2%2b ions from aqueous solutions onto Eichhornia crassipes roots using potentiometry: Low-cost alternative to conventional methods
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abstract
This work presents the use of potentiometric measurements for kinetic studies of biosorption of Cd2%2b ions from aqueous solutions on Eichhornia crassipes roots. The open circuit potential of the Cd/Cd2%2b electrode of the first kind was measured during the bioadsorption process. The amount of Cd2%2b 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.