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Removal of chromium(VI) from aqueous solution by activated carbons: kinetic and equilibrium studies.
J Hazard Mater. 2005 Aug 31; 123(1-3):223-31.JH

Abstract

The objective of this study is to assess the uptake of hexavalent chromium (Cr(VI)) from aqueous solutions onto activated carbons (AC) produced from wood. Two activated carbons are tested, a KOH-activated carbon and a commercial H3PO4-activated carbon (Acticarbone CXV). The adsorption of Cr(VI) is maximal at the lowest values of pH (pH 3) and increases with temperature for both adsorbents. The KOH-activated carbon shows higher capacity for adsorption of Cr(VI) than Acticarbone. The sorption isotherms fit the Langmuir model accurately. The adsorption reaction was found to obey a pseudo second-order rate. The activation energy and the pre-exponential factor as well as the thermodynamic functions related to adsorption reaction, DeltaS degrees , DeltaH degrees , DeltaG degrees , were determined. Nevertheless, the global reaction rate is probably controlled by the intra-particular diffusion of Cr(VI) and the mass diffusivity of Cr(VI) was evaluated.

Authors+Show Affiliations

Université de Technologie de Compiègne, Département de Génie Chimique, Laboratoire de Génie des Procédés Industriels, UMR 6067 du CNRS-BP 20529, 60205 Compiègne, France.No affiliation info available

Pub Type(s)

Comparative Study
Evaluation Study
Journal Article

Language

eng

PubMed ID

15913888

Citation

Khezami, Lotfi, and Richard Capart. "Removal of chromium(VI) From Aqueous Solution By Activated Carbons: Kinetic and Equilibrium Studies." Journal of Hazardous Materials, vol. 123, no. 1-3, 2005, pp. 223-31.
Khezami L, Capart R. Removal of chromium(VI) from aqueous solution by activated carbons: kinetic and equilibrium studies. J Hazard Mater. 2005;123(1-3):223-31.
Khezami, L., & Capart, R. (2005). Removal of chromium(VI) from aqueous solution by activated carbons: kinetic and equilibrium studies. Journal of Hazardous Materials, 123(1-3), 223-31.
Khezami L, Capart R. Removal of chromium(VI) From Aqueous Solution By Activated Carbons: Kinetic and Equilibrium Studies. J Hazard Mater. 2005 Aug 31;123(1-3):223-31. PubMed PMID: 15913888.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Removal of chromium(VI) from aqueous solution by activated carbons: kinetic and equilibrium studies. AU - Khezami,Lotfi, AU - Capart,Richard, PY - 2004/11/19/received PY - 2005/04/05/revised PY - 2005/04/06/accepted PY - 2005/5/26/pubmed PY - 2005/12/13/medline PY - 2005/5/26/entrez SP - 223 EP - 31 JF - Journal of hazardous materials JO - J Hazard Mater VL - 123 IS - 1-3 N2 - The objective of this study is to assess the uptake of hexavalent chromium (Cr(VI)) from aqueous solutions onto activated carbons (AC) produced from wood. Two activated carbons are tested, a KOH-activated carbon and a commercial H3PO4-activated carbon (Acticarbone CXV). The adsorption of Cr(VI) is maximal at the lowest values of pH (pH 3) and increases with temperature for both adsorbents. The KOH-activated carbon shows higher capacity for adsorption of Cr(VI) than Acticarbone. The sorption isotherms fit the Langmuir model accurately. The adsorption reaction was found to obey a pseudo second-order rate. The activation energy and the pre-exponential factor as well as the thermodynamic functions related to adsorption reaction, DeltaS degrees , DeltaH degrees , DeltaG degrees , were determined. Nevertheless, the global reaction rate is probably controlled by the intra-particular diffusion of Cr(VI) and the mass diffusivity of Cr(VI) was evaluated. SN - 0304-3894 UR - https://www.unboundmedicine.com/medline/citation/15913888/Removal_of_chromium_VI__from_aqueous_solution_by_activated_carbons:_kinetic_and_equilibrium_studies_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(05)00184-6 DB - PRIME DP - Unbound Medicine ER -