Adsorption equilibrium and kinetics of U(VI) on beta type of akaganeite

The use of cheap, high efficiency and low-risk adsorbent has been studied for the removal of U(VI) from aqueous solutions. A series of experiments was conducted in a batch system to assess the effect of the system variables, i.e. initial pH, temperature, initial uranium concentration and contact tim...

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Bibliographic Details
Published in:Desalination 2010-11, Vol.263 (1), p.233-239
Main Authors: Yusan, Sabriye, Akyil Erenturk, Sema
Format: Article
Language:English
Subjects:
Adsorbents
Adsorption
Applied sciences
Beta
Chemical engineering
Contact
Exact sciences and technology
Isotherms
Kinetic
Mathematical models
Pollution
Sorption
U(VI)
Uranium
β-FeOOH
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Summary:The use of cheap, high efficiency and low-risk adsorbent has been studied for the removal of U(VI) from aqueous solutions. A series of experiments was conducted in a batch system to assess the effect of the system variables, i.e. initial pH, temperature, initial uranium concentration and contact time. The results of these parameters were given in the previous work. In this paper Langmuir, Freundlich, Temkin, Dubinin–Radushkevich (D–R) and Harkins–Jura isotherms were used to analyze the equilibrium data at different temperatures. Adsorption process fitted to Langmuir and Temkin isotherm models. Also the adsorption kinetics was found to follow pseudo-second-order rate kinetic model, with a good correlation ( R 2 > 0.99) and intraparticle diffusion as one of the rate determining steps. The findings of this investigation suggest that the chemical sorption plays a role in controlling the sorption rate.
ISSN:0011-9164
1873-4464
DOI:10.1016/j.desal.2010.06.064