Abstract
In this article, we first report the synthesis of Titanium oxide (TiO2)-Dialdehyde starch (DAS) nanocomposite which was then successfully embedded in silica (SiO2) matrix obtained by the hydrolytic poly condensation of tetra ethyl ortho silicate (TEOS). FESEM images of TiO2-DAS-SiO2 nanocomposites indicate rod-like structures with spherical DAS particles well embedded in it. Both the composites exhibited wide pore size distribution as evident from Brunauer- Emmett- Teller (BET) analysis and the significant effect of pore size on the transmission properties has also been elucidated in detail. Uv irradiation experiments confirm the enhanced Uv screening activity but reduced photocatalytic property of the TiO2-DAS-SiO2 nanocomposites in comparison to its counterpart TiO2-DAS composites which is desirable for long- term applications. Nitrogen adsorption/desorption measurements reveal a lower surface area of TiO2-DAS-SiO2 nanocomposites (2.49 m2/g) well consistent with its poor photocatalytic performance in comparison to TiO2-DAS composites. The band gap tunability and ability of the synthesized nanocomposites to absorb Uv as well as visible light makes them suitable for optoelectronic applications and as packaging materials for light sensitive food products.
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