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Utilization of waste product (tamarind seeds) for the removal of Cr(VI) from aqueous solutions: equilibrium, kinetics, and regeneration studies.
J Environ Manage. 2009 Jul; 90(10):3013-22.JE

Abstract

In the present study, an adsorbent was prepared from tamarind seeds and used after activation for the removal of Cr(VI) from aqueous solutions. The tamarind seeds were activated by treating them with concentrated sulfuric acid (98% w/w) at a temperature of 150 degrees C. 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, Freundlich, Redlich-Peterson, Koble-Corrigan, Tempkin, Dubinin-Radushkevich and Generalized isotherm models. Application of the Langmuir isotherm to the system yielded a maximum adsorption capacity of 29.7 mg/g at an equilibrium pH value ranging from 1.12 to 1.46. The adsorption process followed second-order kinetics and the corresponding rate constants obtained were 2.605 x 10(-3), 0.818 x 10(-3), 0.557 x 10(-3) and 0.811 x 10(-3) g/mg min(-1) for 50, 200, 300 and 400 mg/L of initial Cr(VI) concentration, respectively. The regenerated activated tamarind seeds showed more than 95% Cr(VI) removal of that obtained using the fresh activated tamarind seeds. A feasible solution is proposed for the disposal of the contaminants (acid and base solutions) containing high concentrations of Cr(VI) obtained during the regeneration (desorption) process.

Authors+Show Affiliations

Chemical Engineering Group, Birla Institute of Technology and Science (BITS), Vidya Vihar Campus, Pilani 333 031, Rajasthan, India.No affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19473746

Citation

Gupta, Suresh, and B V. Babu. "Utilization of Waste Product (tamarind Seeds) for the Removal of Cr(VI) From Aqueous Solutions: Equilibrium, Kinetics, and Regeneration Studies." Journal of Environmental Management, vol. 90, no. 10, 2009, pp. 3013-22.
Gupta S, Babu BV. Utilization of waste product (tamarind seeds) for the removal of Cr(VI) from aqueous solutions: equilibrium, kinetics, and regeneration studies. J Environ Manage. 2009;90(10):3013-22.
Gupta, S., & Babu, B. V. (2009). Utilization of waste product (tamarind seeds) for the removal of Cr(VI) from aqueous solutions: equilibrium, kinetics, and regeneration studies. Journal of Environmental Management, 90(10), 3013-22. https://doi.org/10.1016/j.jenvman.2009.04.006
Gupta S, Babu BV. Utilization of Waste Product (tamarind Seeds) for the Removal of Cr(VI) From Aqueous Solutions: Equilibrium, Kinetics, and Regeneration Studies. J Environ Manage. 2009;90(10):3013-22. PubMed PMID: 19473746.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Utilization of waste product (tamarind seeds) for the removal of Cr(VI) from aqueous solutions: equilibrium, kinetics, and regeneration studies. AU - Gupta,Suresh, AU - Babu,B V, Y1 - 2009/05/26/ PY - 2008/09/03/received PY - 2009/03/12/revised PY - 2009/04/16/accepted PY - 2009/5/29/entrez PY - 2009/5/29/pubmed PY - 2009/10/3/medline SP - 3013 EP - 22 JF - Journal of environmental management JO - J Environ Manage VL - 90 IS - 10 N2 - In the present study, an adsorbent was prepared from tamarind seeds and used after activation for the removal of Cr(VI) from aqueous solutions. The tamarind seeds were activated by treating them with concentrated sulfuric acid (98% w/w) at a temperature of 150 degrees C. 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, Freundlich, Redlich-Peterson, Koble-Corrigan, Tempkin, Dubinin-Radushkevich and Generalized isotherm models. Application of the Langmuir isotherm to the system yielded a maximum adsorption capacity of 29.7 mg/g at an equilibrium pH value ranging from 1.12 to 1.46. The adsorption process followed second-order kinetics and the corresponding rate constants obtained were 2.605 x 10(-3), 0.818 x 10(-3), 0.557 x 10(-3) and 0.811 x 10(-3) g/mg min(-1) for 50, 200, 300 and 400 mg/L of initial Cr(VI) concentration, respectively. The regenerated activated tamarind seeds showed more than 95% Cr(VI) removal of that obtained using the fresh activated tamarind seeds. A feasible solution is proposed for the disposal of the contaminants (acid and base solutions) containing high concentrations of Cr(VI) obtained during the regeneration (desorption) process. SN - 1095-8630 UR - https://www.unboundmedicine.com/medline/citation/19473746/Utilization_of_waste_product__tamarind_seeds__for_the_removal_of_Cr_VI__from_aqueous_solutions:_equilibrium_kinetics_and_regeneration_studies_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0301-4797(09)00127-3 DB - PRIME DP - Unbound Medicine ER -