Tags

Type your tag names separated by a space and hit enter

An adsorption study of Al(III) ions onto chitosan.
J Hazard Mater. 2007 Sep 05; 148(1-2):185-91.JH

Abstract

The adsorption of Al(III) from aqueous solutions onto chitosan was studied in a batch system. The isotherms and the kinetics of adsorption with respect to the initial Al(III) concentration and temperature were investigated. Langmuir and Freundlich adsorption models were applied to describe the experimental isotherms. Equilibrium data fitted very well to the Langmuir model in the entire concentration range (5-40 mg/L). The negative values of free energy (DeltaG degrees) and enthalpy (DeltaH degrees) for the adsorption of Al(III) onto chitosan indicated that the adsorption process is a spontaneous and exothermic one. Two simplified kinetic models, based on pseudo first-order and pseudo second-order equations, were tested to describe the adsorption mechanism. The pseudo second-order kinetic model resulted in an activation energy of 56.4 kJ/mol. It is suggested that the overall rate of Al(III) ion adsorption is likely to be controlled by the chemical process. The values of the enthalpy (DeltaH(#)) and entropy (DeltaS(#)) of activation were 53.7 kJ/mol and -164.4 J/molK, respectively. The free energy of activation (DeltaG(#)) at 30 degrees C was 103.5 kJ/mol.

Authors+Show Affiliations

School of Chemistry, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

17368930

Citation

Septhum, C, et al. "An Adsorption Study of Al(III) Ions Onto Chitosan." Journal of Hazardous Materials, vol. 148, no. 1-2, 2007, pp. 185-91.
Septhum C, Rattanaphani S, Bremner JB, et al. An adsorption study of Al(III) ions onto chitosan. J Hazard Mater. 2007;148(1-2):185-91.
Septhum, C., Rattanaphani, S., Bremner, J. B., & Rattanaphani, V. (2007). An adsorption study of Al(III) ions onto chitosan. Journal of Hazardous Materials, 148(1-2), 185-91.
Septhum C, et al. An Adsorption Study of Al(III) Ions Onto Chitosan. J Hazard Mater. 2007 Sep 5;148(1-2):185-91. PubMed PMID: 17368930.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - An adsorption study of Al(III) ions onto chitosan. AU - Septhum,C, AU - Rattanaphani,S, AU - Bremner,J B, AU - Rattanaphani,V, Y1 - 2007/02/15/ PY - 2006/10/15/received PY - 2007/01/25/revised PY - 2007/02/08/accepted PY - 2007/3/21/pubmed PY - 2007/12/6/medline PY - 2007/3/21/entrez SP - 185 EP - 91 JF - Journal of hazardous materials JO - J Hazard Mater VL - 148 IS - 1-2 N2 - The adsorption of Al(III) from aqueous solutions onto chitosan was studied in a batch system. The isotherms and the kinetics of adsorption with respect to the initial Al(III) concentration and temperature were investigated. Langmuir and Freundlich adsorption models were applied to describe the experimental isotherms. Equilibrium data fitted very well to the Langmuir model in the entire concentration range (5-40 mg/L). The negative values of free energy (DeltaG degrees) and enthalpy (DeltaH degrees) for the adsorption of Al(III) onto chitosan indicated that the adsorption process is a spontaneous and exothermic one. Two simplified kinetic models, based on pseudo first-order and pseudo second-order equations, were tested to describe the adsorption mechanism. The pseudo second-order kinetic model resulted in an activation energy of 56.4 kJ/mol. It is suggested that the overall rate of Al(III) ion adsorption is likely to be controlled by the chemical process. The values of the enthalpy (DeltaH(#)) and entropy (DeltaS(#)) of activation were 53.7 kJ/mol and -164.4 J/molK, respectively. The free energy of activation (DeltaG(#)) at 30 degrees C was 103.5 kJ/mol. SN - 0304-3894 UR - https://www.unboundmedicine.com/medline/citation/17368930/An_adsorption_study_of_Al_III__ions_onto_chitosan_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(07)00246-4 DB - PRIME DP - Unbound Medicine ER -