Abstract
In order to prepare the magnetic adsorbent, polymerization of pyrrole is performed in a mixture containing Fe3O4 and FeCl3. 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 Hg2+ 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.
Highlights
In recent years, water pollution caused by heavy metals has treat mercury containing aqueous solutions include precipitation, extraction, reverse osmosis, membrane technologies, ion exchange, and adsorption.[3]
The Fourier transform infrared (FTIR) spectra of Fe3O4 (Figure S1a, Supporting Information), showed an absorption band at 3386 cm−1 assigned to the stretching vibration
A mixture prepared by dissolution of 0.4 g of Fe3O4 in 80 mL of deionized water was properly homogenized by ultrasonic method and after adding 6.0 g of FeCl3, the mixture was shaken for 10 min. 0.8 mL of pyrrole was added to the mixture and it was agitated for 3 h
Summary
Water pollution caused by heavy metals has treat mercury containing aqueous solutions include precipitation, extraction, reverse osmosis, membrane technologies, ion exchange, and adsorption.[3] Because of simplicity, convenience, become one of the major economic and environmental prob- and high efficiency, adsorption process is one of the most poplems and intensive attentions have been paid to the widely dis- ular methods and attracted considerable attentions for removal tribution of these cations into the environment.[1] Mercury is of heavy metal cations.[4] Application of magnetic adsorbents for one of the most toxic heavy metals.
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