Biosorption kinetics and isotherm studies of Acid Red 57 by dried Cephalosporium aphidicola cells from aqueous solutions


KIRAN İ., AKAR T., Ozcan A. S. , Ozcan A., Tunali S.

Biochemical Engineering Journal, vol.31, no.3, pp.197-203, 2006 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 31 Issue: 3
  • Publication Date: 2006
  • Doi Number: 10.1016/j.bej.2006.07.008
  • Journal Name: Biochemical Engineering Journal
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.197-203
  • Keywords: Cephalosporium aphidicola, biosorption, AR57, isotherms, kinetics, METHYLENE-BLUE, ADSORPTION EQUILIBRIUM, ACTIVATED CARBON, REMOVAL, DYE, BIOSORBENT, HYDROXYLATION, SORPTION, WATER, ACID
  • Eskisehir Osmangazi University Affiliated: Yes

Abstract

Equilibrium, kinetics and thermodynamic studies on the removal of Acid Red 57 (AR57) by biosorption onto dried Cephalosporium aphidicola (C. aphidicola) cells have been investigated in a batch system with respect to pH, contact time and temperature. The results showed that the equilibrium time was attained within 40 min and the maximum biosorption capacity of AR57 dye onto C. aphidicola cells was 2.08 × 10-4 mol g-1 or 109.41 mg g-1 obtained after contact with 0.4 g dm-3 biosorbent concentration, pH0 of 1 and at a temperature of 20 °C. The pseudo-second-order kinetic model was observed to provide the best correlation of the experimental data among the kinetic models studied. Biosorption isotherm models were developed and the Langmuir, Freundlich and Dubinin-Radushkevich (D-R) isotherm models were conformed well to the experimental data. The changes of free energy, enthalpy and entropy of biosorption were also evaluated for the biosorption of AR57 dye onto C. aphidicola cells. © 2006 Elsevier B.V. All rights reserved.