Chitosan-nanosilica hybrid materials: Preparation and properties

•Hybrid chitosan-nanosilica materials were synthesized using an adsorption modification method.•The chitosan adsorption capacity is higher on the silica/titania and silica/alumina than on the fumed silica.•Nanosilicas undergo structural and textural alterations due to modification by chitosan.•The m...

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Bibliographic Details
Published in:	Applied surface science Vol. 320; pp. 563 - 569
Main Authors:	Podust, T.V., Kulik, T.V., Palyanytsya, B.B., Gun’ko, V.M., Tóth, A., Mikhalovska, L., Menyhárd, A., László, K.
Format:	Journal Article
Language:	English
Published:	Amsterdam Elsevier B.V 30-11-2014 Elsevier
Subjects:	Adsorption Aggregates Chitosan Condensed matter: electronic structure, electrical, magnetic, and optical properties Condensed matter: structure, mechanical and thermal properties Cross-disciplinary physics: materials science; rheology Exact sciences and technology Fumed nanooxide Mixed oxides Nanostructure Physics Silica Silicon dioxide Surface chemistry Surface modification Titanium dioxide Surface modification Chitosan Adsorption Silica Fumed nanooxide Inorganic compounds Silicon oxides Surface treatments Materials preparation
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Summary:	•Hybrid chitosan-nanosilica materials were synthesized using an adsorption modification method.•The chitosan adsorption capacity is higher on the silica/titania and silica/alumina than on the fumed silica.•Nanosilicas undergo structural and textural alterations due to modification by chitosan.•The more severe chitosan thermodestruction occurs on the silica/titania and silica/alumina surfaces than on the plain silica surface. The research focuses on the synthesis of novel organic–inorganic hybrid materials based on polysaccharide chitosan and nanosilicas (SiO2, TiO2/SiO2 and Al2O3/SiO2). The chitosan modified nanooxides were obtained by the equilibrium adsorption method. The chitosan adsorption capacities of silica/titania and silica/alumina are higher than of the plain silica due to the additional active sites present on the surfaces of the mixed oxides. The hybrid materials were characterized by low-temperature nitrogen adsorption/desorption, photon correlation spectroscopy (PCS), scanning electron microscopy (SEM), thermogravimetry (TG/DTG) and temperature-programmed desorption with mass spectrometry control (TPD MS) methods. The chitosan treatment only modestly influences the surface area SBET of the nanooxides but the rearrangement of the secondary and tertiary structures (aggregates and agglomerates) results in an enhancement of the mesoporosity and affects the size of the aggregates. The more severe thermodestruction of the polysaccharide desorbing from the modified mixed silicas indicates a stronger interaction between the chitosan and the mixed oxides compared to the silanol groups of the plain silica surface.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0169-4332 1873-5584
DOI:	10.1016/j.apsusc.2014.09.038