Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
582019 | Journal of Hazardous Materials | 2009 | 6 Pages |
Abstract
The adsorption behavior of crystal violet (CV+) from aqueous solution onto raw (RB) and acid activated (AAB) bentonite samples was investigated as a function of parameters such as initial CV+ concentration, contact time and temperature. The Langmuir and Freundlich adsorption models were applied to describe the equilibrium isotherms. The adsorption rate was fast and more than half of the adsorbed-CV+ was removed in the first 55Â min for RB and 25Â min for 0.2-AAB at the room temperature (C0Â =Â 1.2Â mmol/g). The pseudo-first order, and pseudo-second order kinetic models were used to describe the kinetic data and rate constants were evaluated. The results best fit the pseudo-second order kinetic model with the rate constant, k2, in the range of 13.52Â ÃÂ 10â2 to 5.53Â ÃÂ 10â2Â g/mmol and 52.70Â ÃÂ 10â2 to 6.69Â ÃÂ 10â2Â mmol/g min for RB and 0.2-AAB sample, respectively (C0Â =Â 0.1-1.2Â mmol/g).
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Authors
E. Eren, B. Afsin,