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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. 3095-3106
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Bioline Code: st15293
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. 3095-3106
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Kinetic and isotherm analysis for selective thorium(IV) retrieval from aqueous environment using eco-friendly cellulose composite
Bhalara, P. D.; Punetha, D. & Balasubramanian, K.
Abstract
Thorium reclamation was studied using nano-iron
oxide-impregnated cellulose acetate beads to gain
insights into the adsorption mechanism, kinetics and thermodynamics.
The designed experiments were thoroughly
investigated as a function of solution pH, initial thorium(
IV) ion concentration, adsorbent dose and nano-iron
oxide loading in the cellulose acetate matrix. The batch
adsorption of Th(IV) ions revealed the highly pH dependent
(pH range 3.0–9.0) behaviour with maximum sorption
at pH 6.0 and equilibrium being achieved within 2 h for
maximum concentration of 100 mg/L at 298 K. Rapid
adsorption of 50 ± 0.2 % was observed within first
10 min. The kinetics data are best described by the pseudofirst-
order kinetic model (R2 = 0.9996) and intraparticle
diffusion model. The equilibrium adsorption process was
fitted with the Langmuir, Freundlich, Dubinin–Radushkevich
and Temkin models which yield good fit with Langmuir
isotherm equation indicating monolayer adsorption
process. The calculated thermodynamics parameter reveals
spontaneous and exothermic adsorption process. Further,
the desorption was Th(IV) ions that was easily achieved
using 0.05 N HNO3 which suggests the reusability of the
adsorbent for multiple use.
Keywords
Thorium(IV); Cellulose; Adsorption; Diffusion; Kinetics and isotherms
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