In the present study, an adsorbent was prepared from tamarind seeds and batch studies were conducted for Cr(VI) removal from aqueous solutions. Tamarind seeds were activated by heat treatment and with concentrated sulfuric acid (98% w/w). The parameters investigated include initial pH, contact time, initial Cr(VI) concentration, and adsorbent dosage. The adsorption of Cr(VI) was found to be maximum at low values of initial pH in the range of 1–3. The adsorption process of Cr(VI) was tested with Langmuir and Freundlich isotherm models. Application of the Langmuir isotherm to the systems yielded maximum adsorption capacity of 29.08 mg g–1. The adsorption process followed second order kinetics and the corresponding rate constant was found to be 0.0026 g mg–1 min–1.
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September 2008
Review Article|
July 30 2008
Removal of Cr(VI) from wastewater using activated tamarind seeds as an adsorbent
B.V. Babu;
aChemical Engineering Department, Birla Institute of Technology and Science (BITS), PILANI - 333 031, Rajasthan, India.
Corresponding author (email: bvbabu@bits-pilani.ac.in)
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Suresh Gupta
aChemical Engineering Department, Birla Institute of Technology and Science (BITS), PILANI - 333 031, Rajasthan, India.
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Corresponding author (email: bvbabu@bits-pilani.ac.in)
*
91-4143-68585(email: sureshg@bits-pilani.ac.in)
Publisher: Emerald Publishing
Received:
December 21 2006
Accepted:
May 21 2008
Online ISSN: 1496-256X
Print ISSN: 1496-2551
2008
Journal of Environmental Engineering and Science (2008) 7 (5): 553–557.
Article history
Received:
December 21 2006
Accepted:
May 21 2008
Citation
Babu B, Gupta S (2008), "Removal of Cr(VI) from wastewater using activated tamarind seeds as an adsorbent". Journal of Environmental Engineering and Science, Vol. 7 No. 5 pp. 553–557, doi: https://doi.org/10.1139/S08-025
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