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Adsorptive Removal of Crystal Violet Dye Using Agricultural Waste Cocoa (theobroma cacao) Shell

Author Affiliations

  • 1Department of Chemistry, PSG College of Technology, Coimbatore - 641004, INDIA
  • 2Department of Chemistry, Chikkanna Arts College, Tirupur- 641602, INDIA

Res.J.chem.sci., Volume 1, Issue (7), Pages 38-45, October,18 (2011)


In this study, the ability of Cocoa (Theobroma cacao)Shell Activated Carbon (CSAC) to adsorb Crystal Violet (CV) dye from aqueous solution was investigated. Activated carbon was prepared from cocoa shell, an agricultural waste and batch mode adsorption experiments were conducted. The influence of various factors such as initial concentration (20, 40, 60,80mg/lt), contact time, pH (1.0-10.0) and carbon dosage on the adsorption capacity were investigated and optimal experimental conditions was ascertained. Adsorption data were modeled using Langmuir, Freundlich, Temkin and Dubinin-Raduskevich (DR) adsorption isotherms. Adsorption kinetics was verified by pseudo-first order, pseudo-second order and intraparticle diffusion models. The kinetic adsorption data fitted the pseudo-second order kinetic model well and also followed the intra-particle diffusion model. The results indicated that CSAC could be employed as low cost adsorbent in waste water treatment for the removal of CV.


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