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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.


Comparison of adsorption capacity of chitosan (1) and composite (2). Comparisons were calculated per 1 g of chitosan with respect to studied oxoanions.
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Fig9: Comparison of adsorption capacity of chitosan (1) and composite (2). Comparisons were calculated per 1 g of chitosan with respect to studied oxoanions.

Mentions: The obtained values of the adsorption capacities of the chitosan-silica composite and the partially crosslinked chitosan beads with respect to V(V), Mo(VI), and Cr(VI) oxoanions from solutions with different concentrations of metals are shown in Table 3. The data indicate that chitosan has a higher adsorption capacity compared to that of the chitosan-silica composite. In spite of this, taking into account that the obtained composite includes chitosan from 38 to 100 mg/g, the contribution of organic part to the maximum adsorption capacity (qe) with respect to each of the studied ions was estimated (Figure 9). A qe of 1 g of initial chitosan with respect to V(V) oxoanions from the neutral medium is 5 mg/g, but under the same conditions, a qe of 1 g of immobilized chitosan is 10 mg/g, which is almost twice higher than the adsorption capacity of the chitosan beads.Table 3


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)

Comparison of adsorption capacity of chitosan (1) and composite (2). Comparisons were calculated per 1 g of chitosan with respect to studied oxoanions.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Fig9: Comparison of adsorption capacity of chitosan (1) and composite (2). Comparisons were calculated per 1 g of chitosan with respect to studied oxoanions.
Mentions: The obtained values of the adsorption capacities of the chitosan-silica composite and the partially crosslinked chitosan beads with respect to V(V), Mo(VI), and Cr(VI) oxoanions from solutions with different concentrations of metals are shown in Table 3. The data indicate that chitosan has a higher adsorption capacity compared to that of the chitosan-silica composite. In spite of this, taking into account that the obtained composite includes chitosan from 38 to 100 mg/g, the contribution of organic part to the maximum adsorption capacity (qe) with respect to each of the studied ions was estimated (Figure 9). A qe of 1 g of initial chitosan with respect to V(V) oxoanions from the neutral medium is 5 mg/g, but under the same conditions, a qe of 1 g of immobilized chitosan is 10 mg/g, which is almost twice higher than the adsorption capacity of the chitosan beads.Table 3

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.