Studies of kinetics and isotherm effect on Brilliant Green dye with activated carbon

Environmental Chemistry Research Lab, Department of Chemistry, University of Allahabad,

Allahabad-211 002, Uttar Pradesh, India

E-mail : am ita_ ecsl@rediffmail.com, mcc46@rediffmail.com

Manuscript received 11 May 2009, revised 16 July 2009, accepted 21 July 2009

Activated carbon prepared from low cost coconut fiber has been utilized as the adsorbent for the removal of basic dyes from aqueous solution. A basic dye, Brilliant Green has been used as the adsorbate. Experiments were conducted at different initial concentration, different adsorbent dose, temperature, pH and different contact time. The most effective removal of color was at pH 7 and the percentage removal increased with the increase in carbon dose, while the percentage removal decreased with increasing initial dye concentration. The adsorption data best fitted with Langmuir than Freundlich isotherm. Kinetic study was also undertaken and it was found that the interaction follows the pseudo-second order than pseudo-first order. Thermodynamic parameters were also calculated.