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Synthesis and adsorption properties of chitosan-silica nanocomposite prepared by sol-gel method.

Budnyak TM, Pylypchuk IV, Tertykh VA, Yanovska ES, Kolodynska D - Nanoscale Res Lett (2015)

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine, 17 General Naumov Str., 03164 Kyiv, Ukraine.

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.

No MeSH data available.


FTIR spectra of chitosan (A) and chitosan-silica composite (B).
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Fig2: FTIR spectra of chitosan (A) and chitosan-silica composite (B).

Mentions: In order to confirm the SiO2 creation as a part of the hybrid composite chitosan-silica, FTIR spectra were obtained for the initial chitosan and synthesized composite (Figure 2). In the FTIR spectrum of chitosan (Figure 2A), the band at 3,429 cm−1 corresponds to the stretching vibrations O-H of hydroxyl groups bound with carbon atoms. Intensive absorption bands at 2,800 to 3,000 cm−1 are observed due to the С-Н stretching vibrations. The band at 1,580 cm−1 corresponds to the deformation vibrations of -NH2; 1,420 and 1,380 сm−1 for C-H bending vibrations, 1,310 сm−1 for asymmetric С-О-С stretching vibrations, and 1,080 сm−1 for С-О stretching vibration of СН-ОН were observed.Figure 2


Synthesis and adsorption properties of chitosan-silica nanocomposite prepared by sol-gel method.

Budnyak TM, Pylypchuk IV, Tertykh VA, Yanovska ES, Kolodynska D - Nanoscale Res Lett (2015)

FTIR spectra of chitosan (A) and chitosan-silica composite (B).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4385279&req=5

Fig2: FTIR spectra of chitosan (A) and chitosan-silica composite (B).
Mentions: In order to confirm the SiO2 creation as a part of the hybrid composite chitosan-silica, FTIR spectra were obtained for the initial chitosan and synthesized composite (Figure 2). In the FTIR spectrum of chitosan (Figure 2A), the band at 3,429 cm−1 corresponds to the stretching vibrations O-H of hydroxyl groups bound with carbon atoms. Intensive absorption bands at 2,800 to 3,000 cm−1 are observed due to the С-Н stretching vibrations. The band at 1,580 cm−1 corresponds to the deformation vibrations of -NH2; 1,420 and 1,380 сm−1 for C-H bending vibrations, 1,310 сm−1 for asymmetric С-О-С stretching vibrations, and 1,080 сm−1 for С-О stretching vibration of СН-ОН were observed.Figure 2

Bottom Line: 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.

View Article: PubMed Central - PubMed

Affiliation: Chuiko Institute of Surface Chemistry of National Academy of Sciences of Ukraine, 17 General Naumov Str., 03164 Kyiv, Ukraine.

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.

No MeSH data available.