Kinetic and equilibrium studies on the adsorption of lead by the chitin of pink shrimp (Solenocera melantho)

The presence of metal ions in aqueous solutions represents a major environmental problem. These inorganic species are persistent and non-biodegradable pollutants that should be eliminated from water. In the recent years, Biosorption is emerging as a technique offering the use of economical alternate biological materials for the decontamination of polluted water. This paper presents a systematic characterization of new and commonly abundant low-cost biosorbents: chitin of pink shrimp (Solenocera melantho). Lead was chosen as a model sorbet. The effect of the most significant process parameters (pH, initial concentration of lead ions on kinetics, as well as pH) on biosorption equilibrium was studied. The equilibrium was reached within 0-200 minutes. Optimum conditions of pH, contact time, biosorption dosage and initial concentration of lead were determined to be 9, 0-200 minutes, 5gr/L and 7.99ppm respectively. The best efficiency biosorption was found to be 99.7%. The kinetics of the process in the case of both biomaterials was described with pseudo-second order equation and the equilibrium of biosorption by chitin produced by pink shrimp was described with the Freundlich equation and Langmuir model. These equations were chosen to achieve the best consistency of experimental data with the model results.

Key words: Chitin, Lead ion, Biosorption, Isotherm models, Kinetic models

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