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Modelling of Equilibrium Data for the Adsorption of Crystal Violet onto Activated Carbon by Non-Linear Regression Method

Syed Usman Nasrin Banu, G.Maheswaran, N. Ramesh

The feasibility of preparing activated carbon from Eichornia Crassipes by chemical activation was investigated. Batch experiments were carried out for the sorption of Crystal violet onto the prepared activated carbons. Equilibrium data for the adsorption of the dyes onto activated carbon were obtained from batch adsorption experiments. Two parameter isotherm models including Langmuir, Freundlich, Temkin and Dubinin-Radushkevich were employed for fitting equilibrium data. Three parameter isotherm models including Redlich-Peterson, Toth, and Koble-Corrigan models were also employed for fitting the equilibrium data. Non-linear regression method was used to determine the best fit model to the equilibrium data. The results were interpreted using correlation coefficient, coefficient of determination, MPSD and HYBRID functions for calculating error and determining goodness of fit of the various isotherms.