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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. 10, 2015, pp. 3107-3116
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Bioline Code: st15294
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. 10, 2015, pp. 3107-3116
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Removal of yttrium (III) ions from water solutions by alginate compounds
Khotimchenko, M.; Kovalev, V.; Khozhaenko, E. & Khotimchenko, R.
Abstract
The presence of radioactive substances in
wastewaters poses a problem for public health due to the
lack of the radioisotope-binding materials. In the present
study, the yttrium-binding activity of sodium and calcium
salts of alginic acid was investigated in a batch sorption
system. The results showed that both polymers are able to
form complexes with yttrium ions. The effects of contact
time, initial concentration of the metal and pH of the media
on the yttrium-binding processes were experimentally
investigated. The equilibrium time was found to be at least
60 min required for adsorption of yttrium by alginate
compounds regardless of the initial metal concentrations.
Langmuir and Freundlich sorption models were applied for
description of the binding processes. The results showed
that the Langmuir model is best fit within the whole range
of pH values used in the studies. The maximum adsorption
capacity of calcium and sodium alginates was found to be
99.01 and 181.81 mg/g, respectively, at pH 6.0. Kinetic
studies showed that reactions between alginate compounds
and yttrium are corresponding to the pseudo-second-order
model. These results obviously show that alginate salts
may be successfully used as materials for elimination of
radioisotopes from water disposals.
Keywords
Alginate; Yttrium; Biosorption; Adsorption isotherm; Equilibrium; Kinetics
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