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The removal of nitrate from aqueous solutions by chitosan hydrogel beads.
J Hazard Mater. 2009 May 30; 164(2-3):1012-8.JH

Abstract

A physico-chemical investigation of the adsorption of nitrate by chitosan hydrobeads was conducted. The adsorption of nitrate by chitosan hydrobeads was increased with a decrease in the pH of the solution. The adsorption process was found to be temperature dependant with an optimum activity at 30 degrees C. Adsorption capacity was found to decrease with increases in temperature after 30 degrees C, indicating the exothermic nature of this process. Theoretical correlation of the experimental equilibrium adsorption data for the nitrate-chitosan hydrobeads system was properly explained by the Langmuir isotherm model. This was supported by the fact that homogeneity index was close to unity (0.98-1.08) from Langmuir-Freundlich isotherm model. The maximum adsorption capacity was 92.1mg/g at 30 degrees C. The kinetic results corresponded well with the pseudo-second-order rate equation. Intra-particle diffusion also played a significant role at the initial stage of the adsorption process. Thermodynamic parameters such as the Gibbs free energy (DeltaG(0)), enthalpy (DeltaH(0)), and entropy (DeltaS(0)) for the nitrate adsorption were estimated. Results suggest that the adsorption process is a spontaneous, exothermic process that has positive entropy. Desorption of nitrate from the loaded beads was accomplished by increasing the pH of the solution to the alkaline range, and a desorption ratio of 87% was achieved around pH 12.0.

Authors+Show Affiliations

Department of Chemical Engineering, Hanbat National University, Yuseong-Gu, Daejeon, Republic of Korea.No affiliation info available

Pub Type(s)

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

Language

eng

PubMed ID

18977085

Citation

Chatterjee, Sudipta, and Seung Han Woo. "The Removal of Nitrate From Aqueous Solutions By Chitosan Hydrogel Beads." Journal of Hazardous Materials, vol. 164, no. 2-3, 2009, pp. 1012-8.
Chatterjee S, Woo SH. The removal of nitrate from aqueous solutions by chitosan hydrogel beads. J Hazard Mater. 2009;164(2-3):1012-8.
Chatterjee, S., & Woo, S. H. (2009). The removal of nitrate from aqueous solutions by chitosan hydrogel beads. Journal of Hazardous Materials, 164(2-3), 1012-8. https://doi.org/10.1016/j.jhazmat.2008.09.001
Chatterjee S, Woo SH. The Removal of Nitrate From Aqueous Solutions By Chitosan Hydrogel Beads. J Hazard Mater. 2009 May 30;164(2-3):1012-8. PubMed PMID: 18977085.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - The removal of nitrate from aqueous solutions by chitosan hydrogel beads. AU - Chatterjee,Sudipta, AU - Woo,Seung Han, Y1 - 2008/09/05/ PY - 2008/04/08/received PY - 2008/08/30/revised PY - 2008/09/01/accepted PY - 2008/11/4/pubmed PY - 2009/5/19/medline PY - 2008/11/4/entrez SP - 1012 EP - 8 JF - Journal of hazardous materials JO - J Hazard Mater VL - 164 IS - 2-3 N2 - A physico-chemical investigation of the adsorption of nitrate by chitosan hydrobeads was conducted. The adsorption of nitrate by chitosan hydrobeads was increased with a decrease in the pH of the solution. The adsorption process was found to be temperature dependant with an optimum activity at 30 degrees C. Adsorption capacity was found to decrease with increases in temperature after 30 degrees C, indicating the exothermic nature of this process. Theoretical correlation of the experimental equilibrium adsorption data for the nitrate-chitosan hydrobeads system was properly explained by the Langmuir isotherm model. This was supported by the fact that homogeneity index was close to unity (0.98-1.08) from Langmuir-Freundlich isotherm model. The maximum adsorption capacity was 92.1mg/g at 30 degrees C. The kinetic results corresponded well with the pseudo-second-order rate equation. Intra-particle diffusion also played a significant role at the initial stage of the adsorption process. Thermodynamic parameters such as the Gibbs free energy (DeltaG(0)), enthalpy (DeltaH(0)), and entropy (DeltaS(0)) for the nitrate adsorption were estimated. Results suggest that the adsorption process is a spontaneous, exothermic process that has positive entropy. Desorption of nitrate from the loaded beads was accomplished by increasing the pH of the solution to the alkaline range, and a desorption ratio of 87% was achieved around pH 12.0. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/18977085/The_removal_of_nitrate_from_aqueous_solutions_by_chitosan_hydrogel_beads_ DB - PRIME DP - Unbound Medicine ER -