Synthesis and characterization of poly(ethylene glycol dimethacrylate-1-vinyl-1,2,4-triazole) copolymer beads for heavy-metal removal
No Thumbnail Available
Date
2006-12-05
Journal Title
Journal ISSN
Volume Title
Publisher
Wiley
Abstract
We prepared poly(ethylene glycol dimethacrylate-l-vinyl-1,2,4-triazole) [poly(EGDMA-VTAZ)] beads (average diameter = 150-200 mu m) by copolymerizing ethylene glycol dimethacrylate (EGDMA) with 1-vinyl-1,2,4-triazole (VTAZ). The copolymer composition was characterized by elemental analysis and found to contain five EGDMA monomer units for each VTAZ monomer unit. The poly(EGDMA-VTAZ) beads had a specific surface area of 65.8 m(2)/g. Poly(EGDMA-VTAZ) beads were characterized by Fourier transform infrared spectroscopy, elemental analysis, surface area measurements, swelling studies, and scanning electron microscopy. Poly(EGDMAVTAZ) beads with a swelling ratio of 84% were used for the heavy-metal removal studies. The adsorption capacities of the beads for Cd(II), Hg(II), and Pb(II) were investigated in aqueous media containing different amounts of these ions (5-750 mg/L) and at different pH values (3.0-7.0). The maximum adsorption capacities of the poly(EGDMA-VTAZ) beads were 85.7 mg/g (0.76 mmol/g) for Cd(II), 134.9 mg/g (0.65 mmol/g) for Pb(II), and 186.5 mg/g (0.93 mmol/g) for Hg(II). The affinity order toward triazole groups on a molar basis was observed as follows: Hg(II) > Cd(II) > Pb(II). pH significantly affected the adsorption capacity of the VTAZ-incorporated beads. The equilibrium data were well fitted to the Redlich-Peterson isotherm. Consideration of the kinetic data suggested that chemisorption processes could have been the rate-limiting step in the adsorption process. Regeneration of the chelating-beads was easily performed with 0.1M HNO3.
Description
Keywords
Polymer science, Hydrogels, Chromatography, Adsorption, Cadmium(II), Biosorption, Composite, Water, Adsorption, Mercury ions, Lead(II) ions, Aqueous-solutions, Methacrylate) beads, Complexing-ligand, Composition, Copolymerization, Fourier transform infrared spectroscopy, Heavy metals, Monomers, Scanning electron microscopy, Copolymer, Polyethylene glycol, Removal, Swelling, Synthesis, Beads, Copolymer composition, Elemental analysis, Ethylene glycol dimethacrylate (EGDMA), Organic polymers
Citation
Uzun, L. vd. (2006). ''Synthesis and characterization of poly(ethylene glycol dimethacrylate-1-vinyl-1,2,4-triazole) copolymer beads for heavy-metal removal''. Journal of Applied Polymer Science, 102(5), 4276-4283.