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D2EHPA-impregnated alumina for adsorption of strontium ions in environmental samples
Sid Kalal, H.; Abdollahi, M.; Ashoor, M. & Seyedkalal, E.
Abstract
The alumina impregnated by the di-2-ethyl
hexyl phosphoric acid was introduced to make more
adsorption of strontium as well as to determine the optimal
conditions. The influence of various parameters such as pH,
equilibrium time, adsorbent mass, interfering ions, and
various eluant agents for the desorption of the strontium
ions, initial concentration, and temperature was investigated
to find out the adsorption behavior of the adsorbent
under different conditions. The adsorbent was characterized
by the Fourier transform infrared spectroscopy. The
experimental data were fitted on the two-parameter and
three-parameter adsorption isotherm models. The Freundlich
and Redlich–Peterson models have suitable fitting
on the experimental data (R2 = 0.9307). The kinetic
models of adsorption were analyzed by the pseudo-firstand
pseudo-second-order models. The results have been
indicated that the pseudo-second-order kinetic model is
more appropriate than the others. Advantages of our
method were simple operation, less time for preparation of
adsorbent, rapid phase separation, and capability to combine
with various detection techniques. The method has
been utilized to extract and the recovery of strontium ions
in environmental aqueous samples.
Keywords
Alumina; Strontium; Adsorption; Isotherms; D2EHPA
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