A radiotracer study of the adsorption behavior of aqueous Ba2+ ions on nanoparticles of zero-valent iron
Date
2007Source Title
Journal of Hazardous Materials
Print ISSN
0304-3894
Volume
148
Issue
3
Pages
761 - 767
Language
English
Type
ArticleItem Usage Stats
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Abstract
Recently, iron nanoparticles are increasingly being tested as adsorbents for various types of organic and inorganic pollutants. In this study, nanoparticles of zero-valent iron (NZVI) synthesized under atmospheric conditions were employed for the removal of Ba2+ ions in a concentration range 10-3 to 10-6 M. Throughout the study, 133Ba was used as a tracer to study the effects of time, concentration, and temperature. The obtained data was analyzed using various kinetic models and adsorption isotherms. Pseudo-second-order kinetics and Dubinin-Radushkevich isotherm model provided the best correlation with the obtained data. Observed thermodynamic parameters showed that the process is exothermic and hence enthalpy-driven. © 2007 Elsevier B.V. All rights reserved.
Keywords
AdsorptionBarium
Nano-zero-valent iron
Adsorption
Barium
Concentration (process)
Mathematical models
Reaction kinetics
Thermal effects
Kinetic models
Nano-zero-valent iron
Nanoparticles
barium
iron
nanoparticle
tracer
Adsorption
Barium
Concentration (process)
Mathematical models
Nanoparticles
Reaction kinetics
Thermal effects
adsorption
barium
organic pollutant
thermodynamics
tracer
adsorption
aqueous solution
article
concentration (parameters)
correlation analysis
heavy metal removal
isotherm
kinetics
temperature
thermodynamics
Adsorption
Barium
Iron
Kinetics
Microscopy, Electron, Scanning
Nanoparticles
Temperature
Thermodynamics
X-Ray Diffraction
Permalink
http://hdl.handle.net/11693/23373Published Version (Please cite this version)
http://dx.doi.org/10.1016/j.jhazmat.2007.06.122Collections
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