title: Simple synthesis and chelation capacity of N-(2-sulfoethyl)chitosan, a taurine derivative.
abstract: This study presents a simple and effective synthesis method of N-(2-sulfoethyl)chitosan (NSE-chitosan) via a reaction between sodium 2-bromoethanesulfonate and chitosan that allows polymer transformation without using additional reagents and organic solvents. The chemical structure of the obtained NSE-chitosan was characterized by FT-IR and (1)H NMR spectroscopies. Thermogravimetric study of NSE-chitosan coupled with FT-IR analysis has shown stability of the polymer up to 200 °C, which almost does not change with the increase of degree of substitution (DS). The sorption of transition and alkaline earth metal ions from multicomponent solutions on NSE-chitosan was investigated. The synthesized sorbents showed the selective recovery of silver(I) and copper(II) ions from ammonium acetate buffer solution. The increase of DS enhanced the selectivity to silver(I) ions sorption in comparison with copper(II) ions. Selectivity coefficients K(Ag/Cu) increase from 1.3 to 10.9 with DS increasing up to 0.7 (ammonium acetate buffer solution, pH 6.5). Sorption isotherms of transition metal ions on NSE-chitosan with DS = 0.5 have been fitted using Langmuir, Freundlich, and Redlich-Peterson models. The maximum sorption capacities of sorbent in ammonium acetate buffer solution at pH 6.0 were 1.72 mmol/g for Cu(II), 1.23 mmol/g for Ag(I) and below 0.5 mmol/g for Co(II), Zn(II), Cd(II), Pb(II), Mn(II) and Ni(II) ions.
authors.affiliation: Ural Federal University named after the first President of Russia B. N. Yeltsin, 620002, Yekaterinburg, Russia.
authors.forename: Yulia S
authors.initials: YS
authors.lastname: Petrova
authors.affiliation: Ural Federal University named after the first President of Russia B. N. Yeltsin, 620002, Yekaterinburg, Russia.
authors.forename: Ludmila K
authors.initials: LK
authors.lastname: Neudachina
authors.affiliation: I. Ya. Postovsky Institute of Organic Synthesis, Ural Division of Russian Academy of Sciences, 620990 Yekaterinburg, Russia.
authors.forename: Alexandr V
authors.initials: AV
authors.lastname: Mekhaev
authors.affiliation: Ural Federal University named after the first President of Russia B. N. Yeltsin, 620002, Yekaterinburg, Russia; I. Ya. Postovsky Institute of Organic Synthesis, Ural Division of Russian Academy of Sciences, 620990 Yekaterinburg, Russia. Electronic address: pestov@ios.uran.ru.
authors.forename: Alexandr V
authors.initials: AV
authors.lastname: Pestov
mesh_terms: D017738:Alkanesulfonic Acids / Q000737:chemistry; D002614:Chelating Agents / Q000737:chemistry*; D060326:Chemistry Techniques, Synthetic; D048271:Chitosan / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry*; D003300:Copper / Q000737:chemistry / Q000302:isolation & purification; D012834:Silver / Q000737:chemistry / Q000302:isolation & purification; D012996:Solutions; D017550:Spectroscopy, Fourier Transform Infrared; D013654:Taurine / Q000737:chemistry
chemical_list: D017738:Alkanesulfonic Acids; D002614:Chelating Agents; C000602189:N-(2-sulfoethyl)chitosan; D012996:Solutions; D013654:Taurine; C018853:2-bromoethanesulfonic acid; D012834:Silver; D003300:Copper; D048271:Chitosan
keywords: Chitosan; Selectivity; Sorption; Sulfoderivatives; Thermal properties