Kinetic and thermodynamic studies of adsorption of Cd2+ by superparamagnetic nano iron oxide-loaded poly(acrylonitrile-co-acrylic acid) hydrogel

Kinetic and thermodynamic studies of adsorption of Cd2+ by superparamagnetic nano iron... The efficiency of adsorption of cadmium ions from aqueous solutions by superparamagnetic nano iron oxide-loaded poly(acrylonitrile-co-acrylic acid) hydrogel has been investigated. The effect of equilibration time, amount of adsorbent, temperature, adsorbate concentration, and pH was studied by use of a batch system. The copolymer was magnetized in situ and the size, phase identification, morphology, and coating of magnetic nanoparticles were characterized by TEM, AFM, XRD, and FTIR analysis respectively. The sorption data were analyzed and fitted to linearized equations of the Langmuir, Freundlich, and Temkin isotherms. The kinetics of sorption were analyzed by use of pseudo-first-order and pseudo-second-order kinetic models. Kinetic data, rate constants, equilibrium sorption capacities, and related correlation coefficients for each kinetic model were calculated and are discussed. Thermodynamic data ΔG°, ΔH°, and ΔS° were evaluated. It was found the sorption process was feasible, spontaneous, and exothermic in nature. This hydrogel was an efficient adsorbent for removal of Cd2+ ions from water (>98 % removal) and could be regenerated efficiently (>99 %). http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Kinetic and thermodynamic studies of adsorption of Cd2+ by superparamagnetic nano iron oxide-loaded poly(acrylonitrile-co-acrylic acid) hydrogel

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Publisher
Springer Netherlands
Copyright
Copyright © 2013 by Springer Science+Business Media Dordrecht
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-013-1330-x
Publisher site
See Article on Publisher Site

Abstract

The efficiency of adsorption of cadmium ions from aqueous solutions by superparamagnetic nano iron oxide-loaded poly(acrylonitrile-co-acrylic acid) hydrogel has been investigated. The effect of equilibration time, amount of adsorbent, temperature, adsorbate concentration, and pH was studied by use of a batch system. The copolymer was magnetized in situ and the size, phase identification, morphology, and coating of magnetic nanoparticles were characterized by TEM, AFM, XRD, and FTIR analysis respectively. The sorption data were analyzed and fitted to linearized equations of the Langmuir, Freundlich, and Temkin isotherms. The kinetics of sorption were analyzed by use of pseudo-first-order and pseudo-second-order kinetic models. Kinetic data, rate constants, equilibrium sorption capacities, and related correlation coefficients for each kinetic model were calculated and are discussed. Thermodynamic data ΔG°, ΔH°, and ΔS° were evaluated. It was found the sorption process was feasible, spontaneous, and exothermic in nature. This hydrogel was an efficient adsorbent for removal of Cd2+ ions from water (>98 % removal) and could be regenerated efficiently (>99 %).

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Jul 5, 2013

References

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