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E-Journal of Chemistry
Volume 9 (2012), Issue 4, Pages 1683-1698

Removal of Acid Green 25 from Aqueous Solution by Adsorption

1Department of Chemistry, Sri Meenakshi Government College for Women, Madurai, Tamil Nadu, 625 002, India
2Department of Chemistry, Periyar University, Salem, Tamil Nadu, 636 011, India
3Department of Chemistry, Arignar Anna Government Arts College, Namakkal, Tamil Nadu. 637 002, India

Received 18 August 2011; Accepted 26 October 2011

Copyright © 2012 Hindawi Publishing Corporation. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The adsorptive removal of Acid Green 25 by Ananas Comosus (L) Activated carbon was investigated in this study. The effects of initial dye concentration, contact time, pH and temperature were studied for the adsorption of Acid Green 25 in batch mode. At 100 mg/L of initial dye concentration the adsorbent removes 182.6 mg/g of dye from solution; it further increases on increasing the temperature. The calculated values of ∆G° indicate that the adsorption process is spontaneous, negative ∆H° indicate that the adsorption process is exothermic and the positive value of ∆S° indicates the increase in randomness. The rate of dye adsorption follows pseudo second order model with an r2 value of 0. 999. Standard adsorption isotherms were used to fit the experimental equilibrium data. The Langmuir, Freundlich, and Tempkin models are appropriate to explain the adsorption phenomenon with good fit.