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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 12, No. 1, 2015, pp. 183-192
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Bioline Code: st15016
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 12, No. 1, 2015, pp. 183-192
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Maxwell–Stefan based modelling of ion exchange systems containing common species (Cd2+, Na+) and distinct sorbents (ETS-4, ETS-10)
Lito, P.F.; Aniceto, J.P.S. & Silva, C.M.
Abstract
Cadmium(II) is a toxic hazardous cation,
whose presence in the environment causes great concern
because of its bioaccumulation in organisms and bioamplification
along food chain. Hence, the removal of cadmium
compounds from industrial waters and wastewaters
is particularly essential, which requires intensive experimental
and modelling studies to deal with the problem. In
this work, the ion exchange of Cd2+ ions from aqueous
solution using microporous titanosilicates (ETS-4 and
ETS-10) has been modelled using adapted Maxwell–Stefan
equations for the ions transport inside the sorbent
particles. The fundamentals of the Maxwell–Stefan equations
along with correlations for the convective mass
transfer coefficients have been used with advantage to
reduce the number of model parameters. In the whole, the
model was able to represent successfully the kinetic
behaviour of 11 independent and very distinct curves of
both studied systems (Cd2+/Na+/ETS-4 and Cd2+/Na+/
ETS-10). The predictive capability of the model has been
also shown, since several uptake curves were accurately
predicted with parameters fitted previously to different sets
of experimental data.
Keywords
Cadmium(II); ETS-4; ETS-10; Ion exchange; Maxwell–Stefan; Modelling
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