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Moringa Oleifera, A Biosorbent for Resorcinol Adsorption-Isotherm and Kinetic Studies

  • Kalavathy, M. Helen (Department of Chemical Engineering, A. C. College of Technology, Anna University) ;
  • Swaroop, G. (Department of Chemical Engineering, A. C. College of Technology, Anna University) ;
  • Padmini, E. (Department of Chemical Engineering, A. C. College of Technology, Anna University) ;
  • Lima Rose, Miranda
  • Received : 2008.10.03
  • Accepted : 2009.03.03
  • Published : 2009.03.30

Abstract

The adsorption of phenolic compound resorcinol on activated carbons prepared from Moringa oleifera (Drumstick bark) has been investigated. Activated carbon was prepared by impregnating Moringa oleifera with 50% phosphoric acid in the ratio of 1:1 and 1:2(w/w), designated as MOAC1 and MOAC2. Equilibrium and isotherm studies were carried out. The influences of variables such as contact time, initial concentration of resorcinol, carbon dosage in the solution on percentage adsorption and adsorption capacity of the bark have been analysed. The equilibration time was found to be 4 h. Kinetics of resorcinol onto activated carbons was checked for pseudo first order and pseudo second order model. It was found that the adsorption of resorcinol follows pseudo second order kinetics for both MOAC1 and MOAC2. The isotherm data were correlated with isotherm models, namely Langmuir and Freundlich. Adsorption isotherms were satisfactorily fitted by both the Langmuir and Freundlich model for MOAC1 and MOAC2.

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