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Kinetics and thermodynamics of cadmium ion removal by adsorption onto nano zerovalent iron particles.
J Hazard Mater. 2011 Feb 15; 186(1):458-65.JH

Abstract

Nano zerovalent iron (nZVI) is an effective adsorbent for removing various organic and inorganic contaminants. In this study, nZVI particles were used to investigate the removal of Cd(2+) in the concentration range of 25-450 mg L(-1). The effect of temperature on kinetics and equilibrium of cadmium sorption on nZVI particles was thoroughly examined. Consistent with an endothermic reaction, an increase in the temperature resulted in increasing cadmium adsorption rate. The adsorption kinetics well fitted using a pseudo second-order kinetic model. The calculated activation energy for adsorption was 54.8 kJ mol(-1), indicating the adsorption process to be chemisorption. The intraparticle diffusion model described that the intraparticle diffusion was not the only rate-limiting step. The adsorption isotherm data could be well described by the Langmuir as well as Temkin equations. The maximum adsorption capacity of nZVI for Cd(2+) was found to be 769.2 mg g(-1) at 297 K. Thermodynamic parameters (i.e., change in the free energy (ΔG(o)), the enthalpy (ΔH(o)), and the entropy (ΔS(o))) were also evaluated. The overall adsorption process was endothermic and spontaneous in nature. EDX analysis indicated the presence of cadmium ions on the nZVI surface. These results suggest that nZVI could be employed as an efficient adsorbent for the removal of cadmium from contaminated water sources.

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Authors+Show Affiliations

Boparai HK
Department of Civil and Environmental Engineering, Faculty of Engineering, The University of Western Ontario, London, Ontario, Canada. hboparai@uwo.ca
Joseph M
No affiliation info available
O'Carroll DM
No affiliation info available

MeSH

AdsorptionCadmiumDiffusionKineticsMicroscopy, Electron, ScanningThermodynamics

Pub Type(s)

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

Language

eng

PubMed ID

21130566

Citation

Boparai, Hardiljeet K., et al. "Kinetics and Thermodynamics of Cadmium Ion Removal By Adsorption Onto Nano Zerovalent Iron Particles." Journal of Hazardous Materials, vol. 186, no. 1, 2011, pp. 458-65.
Boparai HK, Joseph M, O'Carroll DM. Kinetics and thermodynamics of cadmium ion removal by adsorption onto nano zerovalent iron particles. J Hazard Mater. 2011;186(1):458-65.
Boparai, H. K., Joseph, M., & O'Carroll, D. M. (2011). Kinetics and thermodynamics of cadmium ion removal by adsorption onto nano zerovalent iron particles. Journal of Hazardous Materials, 186(1), 458-65. https://doi.org/10.1016/j.jhazmat.2010.11.029
Boparai HK, Joseph M, O'Carroll DM. Kinetics and Thermodynamics of Cadmium Ion Removal By Adsorption Onto Nano Zerovalent Iron Particles. J Hazard Mater. 2011 Feb 15;186(1):458-65. PubMed PMID: 21130566.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Kinetics and thermodynamics of cadmium ion removal by adsorption onto nano zerovalent iron particles. AU - Boparai,Hardiljeet K, AU - Joseph,Meera, AU - O'Carroll,Denis M, Y1 - 2010/11/18/ PY - 2010/09/07/received PY - 2010/11/04/revised PY - 2010/11/07/accepted PY - 2010/12/7/entrez PY - 2010/12/7/pubmed PY - 2011/6/3/medline SP - 458 EP - 65 JF - Journal of hazardous materials JO - J Hazard Mater VL - 186 IS - 1 N2 - Nano zerovalent iron (nZVI) is an effective adsorbent for removing various organic and inorganic contaminants. In this study, nZVI particles were used to investigate the removal of Cd(2+) in the concentration range of 25-450 mg L(-1). The effect of temperature on kinetics and equilibrium of cadmium sorption on nZVI particles was thoroughly examined. Consistent with an endothermic reaction, an increase in the temperature resulted in increasing cadmium adsorption rate. The adsorption kinetics well fitted using a pseudo second-order kinetic model. The calculated activation energy for adsorption was 54.8 kJ mol(-1), indicating the adsorption process to be chemisorption. The intraparticle diffusion model described that the intraparticle diffusion was not the only rate-limiting step. The adsorption isotherm data could be well described by the Langmuir as well as Temkin equations. The maximum adsorption capacity of nZVI for Cd(2+) was found to be 769.2 mg g(-1) at 297 K. Thermodynamic parameters (i.e., change in the free energy (ΔG(o)), the enthalpy (ΔH(o)), and the entropy (ΔS(o))) were also evaluated. The overall adsorption process was endothermic and spontaneous in nature. EDX analysis indicated the presence of cadmium ions on the nZVI surface. These results suggest that nZVI could be employed as an efficient adsorbent for the removal of cadmium from contaminated water sources. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/21130566/Kinetics_and_thermodynamics_of_cadmium_ion_removal_by_adsorption_onto_nano_zerovalent_iron_particles_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(10)01453-6 DB - PRIME DP - Unbound Medicine ER -