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 %).
Research on Chemical Intermediates – Springer Journals
Published: Jul 5, 2013
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