Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
596867 | Colloids and Surfaces A: Physicochemical and Engineering Aspects | 2007 | 12 Pages |
Abstract
The sorption of Methyl Orange by chitosan crosslinked particles was approached using equilibrium and kinetic analyses at different pH's. Besides the standard pseudo-order analysis normally effectuated (i.e. pseudo-first order and pseudo-second order), a novel approach involving a pseudo-nth-order kinetics was used, n being determined via non-linear regression, using the Levenberg-Marquardt method. Zeta potential measurements indicated that electrostatic interactions were important for the sorption process. Regarding equilibrium experiments, data were well fitted to a hybrid Langmuir-Freundlich isotherm. Considering the kinetics of sorption, although a pseudo-nth-order description yielded good fits, a kinetic equation involving diffusion-adsorption phenomena was found to be more consistent, in terms of a physicochemical description of the sorption process.
Related Topics
Physical Sciences and Engineering
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Colloid and Surface Chemistry
Authors
W.A. Morais, A.L.P. Fernandes, T.N.C. Dantas, M.R. Pereira, J.L.C. Fonseca,