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Error analysis of equilibrium studies for the almond shell activated carbon adsorption of Cr(VI) from aqueous solutions.
J Hazard Mater. 2008 Jun 15; 154(1-3):787-94.JH

Abstract

In this study, the preparation of activated carbon from almond shell with H2SO4 activation and its ability to remove toxic hexavalent chromium from aqueous solutions are reported. The influences of several operating parameters such as pH, particle size and temperature on the adsorption capacity were investigated. Adsorption of Cr(VI) is found to be highly pH, particle size and temperature dependent. Four adsorption isotherm models namely, Langmuir, Freundlich, Tempkin and Dubinin-Radushkevich were used to analyze the equilibrium data. The Langmuir isotherm provided the best correlation for Cr(VI) onto the almond shell activated carbon (ASC). Adsorption capacity was calculated from the Langmuir isotherm as 190.3 mg/g at 323 K. Thermodynamic parameters were evaluated and the adsorption was endothermic showing monolayer adsorption of Cr(VI). Five error functions were used to treat the equilibrium data using non-linear optimization techniques for evaluating the fit of the isotherm equations. The highest correlation for the isotherm equations in this system was obtained for the Freundlich isotherm. ASC is found to be inexpensive and effective adsorbent for removal of Cr(VI) from aqueous solutions.

Authors+Show Affiliations

Gebze Institute of Technology, Department of Chemistry, 41400 Gebze, Turkey. erhan@gyte.edu.trNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

18068295

Citation

Demirbas, E, et al. "Error Analysis of Equilibrium Studies for the Almond Shell Activated Carbon Adsorption of Cr(VI) From Aqueous Solutions." Journal of Hazardous Materials, vol. 154, no. 1-3, 2008, pp. 787-94.
Demirbas E, Kobya M, Konukman AE. Error analysis of equilibrium studies for the almond shell activated carbon adsorption of Cr(VI) from aqueous solutions. J Hazard Mater. 2008;154(1-3):787-94.
Demirbas, E., Kobya, M., & Konukman, A. E. (2008). Error analysis of equilibrium studies for the almond shell activated carbon adsorption of Cr(VI) from aqueous solutions. Journal of Hazardous Materials, 154(1-3), 787-94.
Demirbas E, Kobya M, Konukman AE. Error Analysis of Equilibrium Studies for the Almond Shell Activated Carbon Adsorption of Cr(VI) From Aqueous Solutions. J Hazard Mater. 2008 Jun 15;154(1-3):787-94. PubMed PMID: 18068295.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Error analysis of equilibrium studies for the almond shell activated carbon adsorption of Cr(VI) from aqueous solutions. AU - Demirbas,E, AU - Kobya,M, AU - Konukman,A E S, Y1 - 2007/11/04/ PY - 2007/05/22/received PY - 2007/10/03/revised PY - 2007/10/25/accepted PY - 2007/12/11/pubmed PY - 2008/7/30/medline PY - 2007/12/11/entrez SP - 787 EP - 94 JF - Journal of hazardous materials JO - J Hazard Mater VL - 154 IS - 1-3 N2 - In this study, the preparation of activated carbon from almond shell with H2SO4 activation and its ability to remove toxic hexavalent chromium from aqueous solutions are reported. The influences of several operating parameters such as pH, particle size and temperature on the adsorption capacity were investigated. Adsorption of Cr(VI) is found to be highly pH, particle size and temperature dependent. Four adsorption isotherm models namely, Langmuir, Freundlich, Tempkin and Dubinin-Radushkevich were used to analyze the equilibrium data. The Langmuir isotherm provided the best correlation for Cr(VI) onto the almond shell activated carbon (ASC). Adsorption capacity was calculated from the Langmuir isotherm as 190.3 mg/g at 323 K. Thermodynamic parameters were evaluated and the adsorption was endothermic showing monolayer adsorption of Cr(VI). Five error functions were used to treat the equilibrium data using non-linear optimization techniques for evaluating the fit of the isotherm equations. The highest correlation for the isotherm equations in this system was obtained for the Freundlich isotherm. ASC is found to be inexpensive and effective adsorbent for removal of Cr(VI) from aqueous solutions. SN - 0304-3894 UR - https://www.unboundmedicine.com/medline/citation/18068295/Error_analysis_of_equilibrium_studies_for_the_almond_shell_activated_carbon_adsorption_of_Cr_VI__from_aqueous_solutions_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(07)01576-2 DB - PRIME DP - Unbound Medicine ER -