title: Removal of diethyl phthalate from aqueous phase using magnetic poly(EGDMA-VP) beads.
abstract: The barium hexaferrite (BaFe(12)O(19)) containing magnetic poly(ethylene glycol dimethacrylate-vinyl pyridine), (mag-poly(EGDMA-VP)) beads (average diameter=53-212 μm) were synthesized and characterized. Their use as an adsorbent in the removal of diethyl phthalate (DEP) 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 DEP from aqueous solutions such as pH, initial concentration, contact time and temperature were analyzed. The maximum DEP adsorption capacity of the mag-poly(EGDMA-VP) beads was determined as 98.9 mg/g at pH 3.0, 25°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 DEP adsorption capacity did not change after 10 batch successive reactions, demonstrating the usefulness of the magnetic beads in applications.
authors: Department of Chemistry, Uludag University, Bursa, Turkey.
authors: Elif Tümay
authors: ET
authors: Özer
authors: Bilgen
authors: B
authors: Osman
authors: Ali
authors: A
authors: Kara
authors: Necati
authors: N
authors: Beşirli
authors: Seref
authors: S
authors: Gücer
authors: Hüseyin
authors: H
authors: Sözeri
mesh_terms: D000327:Adsorption; D017609:Barium Compounds / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D060328:Magnetic Phenomena; D053768:Metal Nanoparticles / Q000737:chemistry; D008689:Methacrylates / Q000737:chemistry*; D010795:Phthalic Acids / Q000737:chemistry*; D011092:Polyethylene Glycols / Q000737:chemistry*; D011725:Pyridines / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*
chemical_list: D017609:Barium Compounds; D008689:Methacrylates; D010795:Phthalic Acids; D011725:Pyridines; D014874:Water Pollutants, Chemical; C421283:poly(ethylene glycol)-dimethacrylate; C035791:barium hexaferrite; D011092:Polyethylene Glycols; C029351:4-vinylpyridine; C007379:diethyl phthalate