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

J Hazard Mater. 2007 Jul 19;146(1-2):171-9. doi: 10.1016/j.jhazmat.2006.12.002. Epub 2006 Dec 15.


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.

MeSH terms

  • Adsorption
  • Borates / chemistry*
  • Coloring Agents / chemistry*
  • Hot Temperature
  • Hydrogen-Ion Concentration
  • Industrial Waste
  • Mining
  • Solutions
  • Waste Disposal, Fluid / methods
  • Water Pollutants, Chemical / chemistry*
  • Water Purification / methods


  • Borates
  • Coloring Agents
  • Industrial Waste
  • Solutions
  • Water Pollutants, Chemical