title: Synthesis and adsorption performance of dithiocarbamate-modified glycidyl methacrylate starch.
abstract: The design of chelating polymers with fast complexation of the metal ions is particularly interest. In this work, the dithiocarbamate-modified glycidyl methacrylate starch was synthesized and characterized by FT-IR, (13)C NMR and XRD spectra. Its sorption performance for heavy metals fixation was studied. It was found that the removal process of metal ions involved a fast increase stage followed by a slower stage. There was a higher match between the pseudo-second-order equation and the experimental data. The sorption rate constants were related to the substitution rates of hydrated metal ions in aqueous solutions, showing typical chemisorption. The Langmuir isotherm gave satisfying fits to equilibrium data of metals adsorption. And the capacities followed the sequence Cu(2+)>Cd(2+)>Co(2+)>Zn(2+)>Ni(2+)>Mn(2+), which could be well demonstrated with chelating interaction caused by sulfur atoms. Such understanding provides new insights as how to synthesize and use the dithiocarbamate-based polysaccharides.
authors.affiliation: Bayer Technology and Engineering (Shanghai) Co., Ltd., China.
authors.forename: Xiumei
authors.initials: X
authors.lastname: Cheng
authors.forename: Rumei
authors.initials: R
authors.lastname: Cheng
authors.forename: Shengju
authors.initials: S
authors.lastname: Ou
authors.forename: Yijiu
authors.initials: Y
authors.lastname: Li
mesh_terms: D000327:Adsorption; D002614:Chelating Agents / Q000737:chemistry*; D004852:Epoxy Compounds / Q000737:chemistry*; D019216:Metals, Heavy / Q000737:chemistry*; D008689:Methacrylates / Q000737:chemistry*; D013213:Starch / Q000737:chemistry*; D013859:Thiocarbamates / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D002614:Chelating Agents; D004852:Epoxy Compounds; D019216:Metals, Heavy; D008689:Methacrylates; D013859:Thiocarbamates; D014874:Water Pollutants, Chemical; D013213:Starch; C007870:glycidyl methacrylate