title: Synthesis of modified gum tragacanth/graphene oxide composite hydrogel for heavy metal ions removal and preparation of silver nanocomposite for antibacterial activity.
abstract: New composite hydrogels were synthesized based on gum tragacanth (GT) carbohydrate and graphene oxide (GO). GT was sulfonic acid-functionalized and cross-linked by using 2-acrylamido-2-methylpropanesulfonic acid (AMPS) and N,N'-methylenebisacrylamide (MBA) monomers and ceric ammonium nitrate (CAN) as an initiator. The prepared hydrogels were characterized by Fourier transform infrared spectrum (FT-IR), field emission scanning electron microscope (FE-SEM), energy dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD) and thermogravimetric analysis (TGA). Adsorption process for removal of heavy metal ions has followed the pseudo-first-order kinetic model and fitted well with the Langmuir model. The maximum adsorption capacity (Qm) was 142.50, 112.50 and 132.12mgg-1for Pb(II), Cd(II), and Ag(I), respectively. The removal percentage decreased slightly after several adsorption/desorption cycles. The adsorbed Ag(I) ions in hydrogel were transformed to Ag0nanoparticles (with a narrow distribution and mean size of 13.0nm) by using Achillea millefolium flower extract. The antibacterial performance of the Ag0nanocomposite hydrogel was also investigated.
authors.affiliation: Polymer research laboratory, Faculty of Chemistry, University of Mazandaran, Babolsar, Iran.
authors.forename: Razieh
authors.initials: R
authors.lastname: Sahraei
authors.affiliation: Polymer research laboratory, Faculty of Chemistry, University of Mazandaran, Babolsar, Iran. Electronic address: ghaemy@umz.ac.ir.
authors.forename: Mousa
authors.initials: M
authors.lastname: Ghaemy
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry*; D006108:Graphite; D020100:Hydrogels / Q000737:chemistry*; D019216:Metals, Heavy / Q000302:isolation & purification*; D053761:Nanocomposites / Q000737:chemistry*; D010087:Oxides; D012834:Silver; D017550:Spectroscopy, Fourier Transform Infrared; D014144:Tragacanth / Q000737:chemistry*
chemical_list: D000900:Anti-Bacterial Agents; D020100:Hydrogels; D019216:Metals, Heavy; D010087:Oxides; D012834:Silver; D006108:Graphite; D014144:Tragacanth
keywords: Antibacterial activity; Composite hydrogel; Graphene oxide; Gum tragacanth; Heavy metal ions; Silver nanoparticles