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Highly efficient adsorption of hexavalent chromium from the aqueous system using nanoporous carbon modified with tetraethylenepentamine
Ghaffari, A.; Husain, S. W.; Tehrani, M. S.; Anbia, M. & Azar, P. A.
Abstract
An oxidized mesoporous carbon material,
modified with tetraethylenepentamine, has been developed
as a highly efficient adsorbent for hexavalent chromium.
Influence of parameters such as adsorbent dose
(0.1–0.8 g L-1) solution pH (1–9), contact time, and initial
concentration (100–1,000 mg L-1) on adsorption capacity
has been investigated and optimized. The sorption equilibrium
was reached within 60 min. The structural order
and textural properties of the synthesized material were
studied by X-ray diffraction, scanning electron microscopy,
Fourier transform infrared, and nitrogen adsorption–
desorption analysis. The experimental results were analyzed
by the Langmuir and Freundlich isotherms. The
maximum adsorption capacity of 510 mg g-1 at an initial
concentration of 1,000 mg L-1 is well predicted by the
Freundlich isotherm. The kinetic analysis indicated that the
adsorption process was successfully fitted with the pseudofirst-
order kinetic model. Compared to other adsorbents
reported in the literature, the modified nanoporous carbon
material prepared in this study is found to be highly efficient
adsorbent for the removal of hexavalent chromium
from wastewater.
Keywords
Adsorption isotherm; Hexavalent chromium; Mesoporous carbon adsorbent; Tetraethylenepentamine
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