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Study of the Removal of Malachite Green from Aqueous Solution by using Solid Agricultural Waste

Author Affiliations

  • 1 Dept. of Chemistry, Kumaraguru College of Technology, Coimbatore – 641 006, INDIA

Res.J.chem.sci., Volume 1, Issue (1), Pages 88-104, April,18 (2011)


Agricultural solid waste namely Kapok hull was activated by sulphuric acid (1:1 ratio) for removing malachite green dye from aqueous solution. Batch kinetic and isotherm experiments were conducted to determine the sorption and desorption of the malachite green from aqueous solution with activated carbon. The factors affecting the rate of adsorption involved in the removal of dye for initial dye concentration, agitation time, carbon dose, particle size and pH variation have been studied at various temperature ranges at 300, 318 and 330K. The experimental data was analyzed for possible agreement with the Lagergran, Langmuir and Freundlich adsorption isotherm equations. The intraparticle diffusion rate constant, adsorption rate constants, diffusion rate constants and diffusion coefficients were determined. Intraparticle diffusion was found to be the rate-limiting step. The structural and morphological of activated carbon were characterized by XRD and SEM studies respectively. Response surface method using Box-Behnken design of experiments was adopted and gives a mathematical model for the adsorption of dye stuff.


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