Assesment of dimethyl phthalate removal from aqueous phase using barium hexaferrite containing magnetic beads
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Date
2012-07-15
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Academic Press Inc Elsevier Science
Abstract
The barium hexaferrite (BaFe12O19) containing magnetic poly (ethylene glycol dimethacrylate-vinyl pyridine; mag-poly [EGDMA-VP]) beads (average diameter = 53-212 mu m) were synthesized and characterized. Their use as an adsorbent in the removal of dimethyl phthalate (DMP) from an aqueous solution was investigated. The mag-poly (EGDMA-VP) beads were prepared by copolymerizing of 4-vinyl pyridine (VP) with ethylene glycol dimethacrylate (EGDMA). The mag-poly (EGDMA-VP) beads were characterized by N-2 adsorption/desorption isotherms (BET), vibrating sample magnetometer (VSM), X-ray powder diffraction (XRD), elemental analysis, scanning electron microscope (SEM), and swelling studies. At a fixed solid/solution ratio, the various factors affecting the adsorption of DMP from aqueous solutions such as pH, initial concentration, contact time, and temperature were analyzed. The maximum DMP adsorption capacity of the mag-poly (EGDMA-VP) beads was determined as 96.2 mg/g at pH 3.0, 25 degrees C. All the isotherm data can be fitted with both the Langmuir and the Dubinin-Radushkevich isotherm models. The pseudo-first-order, pseudo-second-order, Ritch-second-order, and intraparticle diffusion models were used to describe the adsorption kinetics. The thermodynamic parameters obtained indicated the exothermic nature of the adsorption. The DMP adsorption capacity did not change after 10 batch successive reactions, demonstrating the usefulness of the magnetic beads in applications.
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Keywords
Chemistry, Dimethyl phthalate, Removal, Adsorption, Barium hexaferrite, Magnetic beads, Cross-linked polymer, N-butyl phthalate, Heavy-metal ions, Activated carbon, Mesoporous materials, Potential-theory, Waste-water, Basic dye, Adsorption, Adsorbents, Barium, Dyes, Esters, Ferrite, Isotherms, Scanning electron microscopy, Synthesis (chemical), X ray powder diffraction, 4-vinyl pyridine, Adsorption capacities, Adsorption kinetics, Adsorption/desorption, Aqueous phase, Assesment, Average diameter, Barium hexaferrites, Contact time, Dimethyl phthalate, Dubinin-radushkevich, Ethylene glycol dimethacrylate, Initial concentration, Intraparticle diffusion models, Isotherm data, Isotherm models, Langmuirs, Magnetic beads, Pseudo-first-order, Solid/solution ratio, Swelling studies, Thermodynamic parameter, Vibrating sample magnetometer, XRD
Citation
Osman, B. vd. (2012). "Assesment of dimethyl phthalate removal from aqueous phase using barium hexaferrite containing magnetic beads". Journal of Colloid and Interface Science, 378(1), 167-174.