Study of the kinetics of Cu and Hg adsorption from binary solutions using chitosan
DOI:
https://doi.org/10.5377/nexo.v24i1.591Keywords:
Adsorption kinetics, Binary solution, Chitosan, Kinetic models, Shrimp shellAbstract
In this work, the adsorption kinetic of Cu(II) and Hg(II) onto chitosan was studied from a binary solution at different initial concentration of metallic ions, at different particle sizes and agitation rate. Chitosan was obtained from shrimp shells. Solutions of 1 L of Cu(II) and Hg(II) were placed in contact with 2 g of chitosan and the mixture was agitated by 8 h. Afterwards, the samples were analysed by atomic absorption. The experimental data were tested by application of kinetic models of pseudo-first order and pseudo-second order. The results of adsorption process showed that in the most cases, both ions were effectively adsorbed by chitosan. The percentage of adsorption was 43-100 % and 94-100 % for Cu(II) and Hg(II), respectively. The results also showed that at low concentrations, experimental data were better adjusted by pseudo-first order models; meanwhile, at high concentration, the data were well described by the pseudo-second model. Therefore, the rate-limiting step is the adsorption reaction and not mass transfer.
Keywords: Adsorption kinetics; Binary solution; Chitosan; Kinetic models; Shrimp shell
DOI: http://dx.doi.org/10.5377/nexo.v24i1.591
Nexo, Vol. 24, No. 1, pp. 20-32, 2011
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