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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. 11, No. 4, 2014, pp. 1051-1062
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Bioline Code: st14104
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. 11, No. 4, 2014, pp. 1051-1062
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Removal of arsenate from aqueous media by magnetic chitosan resin immobilized with molybdate oxoanions
Elwakeel, K. Z.
Abstract
Chitosan was cross-linked using glutaraldehyde
in the presence of magnetite. The resin obtained was
chemically modified through the reaction with tetraethylenepentamine
ligand. The obtained resin was loaded with
Mo(VI) and investigated. The adsorption characteristics of
the obtained resin toward As(V) at different experimental
conditions were investigated by means of batch and column
methods. The resin showed high affinity and fast
kinetics for the adsorption of As(V) where an uptake value
of 1.30 mmol g-1 was reported in 6 min at 25 °C. Various
parameters such as pH, agitation time, As(V) concentration
and temperature had been studied. The kinetics and thermodynamic
behavior of the adsorption reaction were
defined. These data indicated an endothermic and spontaneous
adsorption process and kinetically followed pseudosecond-
order model, Fickian diffusion low and Elovich
equation. Breakthrough curves for the removal of
As(V) were studied at different flow rates and bed heights.
The critical bed height for the studied resin column was
found to be 0.656 cm at flow rate of 4 mL min-1. The
mechanism of interaction between As(V) and resin’s active
sites was discussed. Regeneration and durability of the
loaded resin toward the successive cycles were also
clarified.
Keywords
Arsenic (V) removal; Adsorption; Kinetics; Thermodynamics; Column method
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