Removal of acid blue 062 on aqueous solution using calcinated colemanite ore waste


Atar N., Olgun A.

JOURNAL OF HAZARDOUS MATERIALS, vol.146, pp.171-179, 2007 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 146
  • Publication Date: 2007
  • Doi Number: 10.1016/j.jhazmat.2006.12.002
  • Title of Journal : JOURNAL OF HAZARDOUS MATERIALS
  • Page Numbers: pp.171-179
  • Keywords: colemanite ore waste, adsorption, acidic dye, isotherms, Langmuir, LOW-COST ADSORBENTS, DE-OILED-SOYA, FLY-ASH, METHYLENE-BLUE, BOTTOM ASH, MALACHITE GREEN, DYE REMOVAL, EQUILIBRIUM UPTAKE, SORPTION DYNAMICS, COLUMN OPERATIONS

Abstract

Colemanite ore waste (CW) has been employed as adsorbent for the removal of acid blue 062 anionic dye (AB 062) from aqueous solution. The adsorption of AB 062 onto CW was examined with respect to contact time, calcination temperature, particle size, pH, adsorbent dosage and temperature. The physical and chemical properties of the CW, such as particle sizes and calcinations temperature, play important roles in dye adsorption. The dye adsorption largely depends on the initial pH of the solution with maximum uptake occurring at pH 1.Three simplified kinetics models, namely, pseudo-first order, pseudo-second order, and intraparticle diffusion models were tested to investigate the adsorption mechanisms. The kinetic adsorption of AB 062 on CW follows a pseudo-second order equation. The adsorption data have been analyzed using Langmuir and Freundlich isotherms. The results indicate that the Langmuir model provides the best correlation of the experimental data. Isotherms have also been used to obtain the thermodynamic parameters such as free energy, enthalpy and entropy of the adsorption of dye onto CW. (C) 2006 Elsevier B.V. All rights reserved.