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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. 203-210
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Bioline Code: st15018
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. 203-210
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Kinetics and thermodynamics of zinc removal from a metalplating wastewater by adsorption onto an Iranian sepiolite
Hojati, S. & Landi, A.
Abstract
The study of the kinetics and thermodynamics
of the adsorption process can provide valuable information
for the proper design and control of adsorption systems.
The influence of temperature on the kinetics of Zn2+
sorption on an Iranian sepiolite sample was investigated
through a series of batch experiments. Consistent with an
exothermic reaction, an increase in the temperature resulted
in decreasing Zn2+ adsorption rate. The sorption
kinetics was tested for pseudo-first-order, pseudo-secondorder,
and intraparticle diffusion models, and the rate
constants were calculated. Results showed that the
adsorption kinetics followed the pseudo-second-order
kinetic model. The intraparticle diffusion model described
that sorption of Zn onto the sepiolite particles is a two-step
process, and intraparticle diffusion is not the only ratelimiting
step. The results obtained from the study of thermodynamic
data indicated that sorption of Zn onto sepiolite
is non-spontaneous and less favored at higher
temperatures.
Keywords
Sepiolite; Adsorption kinetics; Exothermic; Temperature; Enthalpy
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