Publication Date:
2017-12-28
Description:
In order to prepare the magnetic adsorbent, polymerization of pyrrole is performed in a mixture containing Fe 3 O 4 and FeCl 3 . FTIR, XRD, SEM, EDAX, BET and VSM techniques are employed to characterize the synthesized adsorbent. The results indicate that a homogeneous film of polypyrrole is formed on the surface of magnetic material. The synthesized adsorbent uptakes 173.16 mg g −1 of Hg 2+ from aqueous solution, which is superior to the previously reported results for a similar adsorbent. Magnetic performance of the adsorbent is sufficient to separate the used adsorbent from the solution by use of a magnetic bar placed outside of the vessel. Langmuir, Freundlich, Temkin, Redlich–Peterson, and Sips isotherm models are employed to evaluate the experimental adsorption data. The kinetic models are studied and the experimental data are described by the pseudo-second-order kinetic model. The calculated thermodynamic parameter shows that the sorption process is endothermic and spontaneous. Regeneration of the used adsorbent indicates that more than 90% of the initial capacity remains after regeneration. A magnetic polypyrrole adsorbent is prepared, characterized, and used for removal of Hg 2+ . The optimized uptake of 173.16 mg g −1 of Hg 2+ is obtained, which is superior to previously reported values. Magnetic capability of the adsorbent is sufficient for magnetic separation of the used adsorbent. After regeneration, the used adsorbent retains more than 90% of its initial capacity.
Electronic ISSN:
2056-6646
Topics:
General, Interdisciplinary
,
Energy, Environment Protection, Nuclear Power Engineering
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