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Fundamental Studies for the Adsorption Features of Malachite Green on Granular Activated Carbon  

Baek, Mi-Hwa (Department of Environmental Science and Engineering, Ewha Womans University)
Choi, Young-Jin (Department of Environmental Science and Engineering, Ewha Womans University)
Kim, Young-Ji (Department of Environmental Science and Engineering, Ewha Womans University)
Kim, Dong-Su (Department of Environmental Science and Engineering, Ewha Womans University)
Publication Information
Journal of Korean Society on Water Environment / v.25, no.3, 2009 , pp. 459-463 More about this Journal
Abstract
The adsorption features of malachite green onto activated carbon have been investigated for its treatment from aqueous solution. The influential factors were examined the initial concentration of malachite green, reaction temperature, and pH. Under experimental conditions, adsorption equilibrium of malachite green was attained within 2 hr after the adsorption started. The adsorption reaction of malachite green followed the pseudo-second order rate model, and the adsorption rate constants(k2) decreased with increasing initial concentrations of malachite green. Adsorption behavior of malachite green on activated carbon was found to follow the Freundlich model well in the initial adsorbate concentration range. With increase in temperature, the adsorbed amount of malachite green at equilibrium increased, which indicate that the adsorption reaction was endothermic reaction. Thermodynamic parameters for malachite green adsorption reaction were estimated at varying temperatures, and in the pH range of 2-10, adsorption of malachite green increased.
Keywords
Activated carbon; Adsorption; Malachite green; Thermodynamic estimation;
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