Fibers and Polymers

, Volume 11, Issue 4, pp 572–579

Equilibrium and kinetic modeling of the adsorption of indigo carmine onto silk

  • Naparat Jiwalak
  • Saowanee Rattanaphani
  • John B. Bremner
  • Vichitr Rattanaphani
Article

DOI: 10.1007/s12221-010-0572-2

Cite this article as:
Jiwalak, N., Rattanaphani, S., Bremner, J.B. et al. Fibers Polym (2010) 11: 572. doi:10.1007/s12221-010-0572-2

Abstract

Quantitative adsorption kinetic and equilibrium parameters for indigo carmine dyeing of silk were studied using UV-visible absorption spectroscopy. The effect of initial dye concentration, contact time, pH, material to liquor ratio (MLR), and temperature were determined to find the optimal conditions for adsorption. The mechanism of adsorption of indigo carmine dyeing onto silk was investigated using the pseudo first-order and pseudo second-order kinetic models. The adsorption kinetics was found to follow a pseudo-second-order kinetic model with an activation energy (Ea) of 51.06 kJ/mol. The equilibrium adsorption data of indigo carmine dye on silk were analyzed by the Langmuir and Freundlich models. The results indicate that the Langmuir model provides the best correlation. Adsorption isotherms were also used to obtain thermodynamic parameters such as free energy (ΔGo), enthalpy (ΔHo), and entropy (ΔSo) of adsorption. The negative values of ΔGo and ΔHo indicate the overall adsorption process is a spontaneous and exothermic one.

Keywords

Indigo carmineAdsorption isothermKineticsThermodynamicsSilk dyeing

Copyright information

© The Korean Fiber Society and Springer Netherlands 2010

Authors and Affiliations

  • Naparat Jiwalak
    • 1
  • Saowanee Rattanaphani
    • 1
  • John B. Bremner
    • 2
  • Vichitr Rattanaphani
    • 1
  1. 1.School of ChemistrySuranaree University of TechnologyNakhon RatchasimaThailand
  2. 2.School of ChemistryUniversity of WollongongWollongongAustralia