Kinetic and isotherm analyses for adsorption of a triphenylmethane dye onto jackfruit peel carbon

Department of Chemistry, National Institute of Technology, Tiruchirappalli-620 015, India E-mail : nsulo@yahoo.co.in Fax: 91-431-2500133 Manuscript received 3 November 2003, revised 28 September 2004. accepted 9 December 2004 A carbon adsorbent derived from jackfruit peel was used for the removal of a triphenylmethane dye, malachite green dye, from aqueous solution. Kinetic and isotherm data were modeled with various kinetic (Lagergren's pseudo-first order, Ritchie second order and modified Ritchie second order equations) and isotherm (Freundlich, Langmuir, Redlich-Peterson and Sips equations) model equations and the results obtained were suitably interpreted. The kinetic results were also fitted with the Weber-Morris model to test the role of diffusion and identify different stages of adsorption.