title: Synthesis and adsorption properties of chitosan-silica nanocomposite prepared by sol-gel method.
abstract: A hybrid nanocomposite material has been obtained by in situ formation of an inorganic network in the presence of a preformed organic polymer. Chitosan biopolymer and tetraethoxysilane (TEOS), which is the most common silica precursor, were used for the sol-gel reaction. The obtained composite chitosan-silica material has been characterized by physicochemical methods such as differential thermal analyses (DTA); carbon, hydrogen, and nitrogen (CHN) elemental analysis; nitrogen adsorption/desorption isotherms, scanning electron microscopy (SEM); and Fourier transform infrared (FTIR) spectroscopy to determine possible interactions between silica and chitosan macromolecules. Adsorption of microquantities of V(V), Mo(VI), and Cr(VI) oxoanions from the aqueous solutions by the obtained composite has been studied in comparison with the chitosan beads, previously crosslinked with glutaraldehyde. The adsorption capacity and kinetic sorption characteristics of the composite material were estimated.
authors: Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine, 17 General Naumov Str., 03164 Kyiv, Ukraine.
authors: Tetyana M
authors: TM
authors: Budnyak
authors: Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine, 17 General Naumov Str., 03164 Kyiv, Ukraine.
authors: Ievgen V
authors: IV
authors: Pylypchuk
authors: Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine, 17 General Naumov Str., 03164 Kyiv, Ukraine.
authors: Valentin A
authors: VA
authors: Tertykh
authors: Faculty of Chemistry, Taras Shevchenko National University of Kyiv, 64 Volodymyrska Str., 01033 Kyiv, Ukraine.
authors: Elina S
authors: ES
authors: Yanovska
authors: Faculty of Chemistry, Maria Curie Skłodowska University, M. Curie Skłodowska Sq. 2, 20-031 Lublin, Poland.
authors: Dorota
authors: D
authors: Kolodynska
keywords: 78.67.Bf; 78.67.Sc; 81.07.Pr; 81.16.Be; 82.35.Np