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Yang et al. (2009) evaluated Freundlich and Langmuir isotherm models to study the biosorption of zinc ions on the surface of Aspergillus niger.
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The pseudo-first-order and pseudo-second-order kinetic models were used to study the biosorption kinetics of CV onto PLP (Chowdhury and Saha 2010).
Once studied, the biosorption of Cr (VI) and Ni (II) using one fixed bed column, several models were applied to the experimental data of the breakthrough curves for carrying out the fitting and the determination of the mass transfer parameters.
By acknowledging their wide application and usefulness in sorption studies, the pseudo-first-order and pseudo-second-order kinetic models (Table 1) were used to study the kinetics of MB biosorption onto HFs in the present study.
So the intraparticle diffusion is another kinetic model which was used to study the rate of Cr VI), Ni II) and Cu II) biosorption on SCLP and PDLP.
The curve between (frac{t}{{q_{t} }}) and t yields the value of K 2. In the present work, the mechanistic modeling was performed to study the rate controlling step of the biosorption process.
Some authors have studied mathematical models to describe the biosorption of heavy metals, however, in most cases, they have fitted the models to the experimental data without evaluating the prediction capacity of the model in different operational conditions.
Pseudo-first-order, pseudo-second-order, Elovich equation and intraparticle diffusion models were applied to study the reaction pathways and potential rate limiting steps of the biosorption of Cr VI), Ni II) and Cu II) onto SCLP and PDLP.
The models were also applied to study the individuals as well as the combined effect of different variables influencing the biosorption process.
To know the biosorption mechanisms and speed of the process, it is important to study the mass transfer and chemical reactions.
For this study, Fritz isotherm model and Bangham kinetic model were found as best fitted models for the biosorption of Pb+2 ions.
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