Sol-Gel Preparation of Nanoscale TiO2-SiO2 Composite for Eliminating of Con Red Azo DyeReport as inadecuate




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A new anatase-SiO2 nanocomposite was synthesized by sol-gel method at room temperature using titanium tetrachloride and tetraethylorthosilicate as raw materials. Characterization of the product was carried out by means of X-ray diffraction XRD, X-ray fluorescence spectroscopy XRF, transmission electron microscopy TEM, Brunauer-Emmett-Teller BET specific surface areas, Thermogravimetry analysis TGA, Fourier transform infrared FT-IR, and UV-vis absorption spectroscopy. Thermal phase transformation studies of composite were carried out up to 1100°C which showed the establishment of anatase TiO2 phase. The presence of some tetrahedral coordination of TiO2 species in SiO2 matrix was confirmed by UV-Vis study. The produced TiO2-SiO2 nanocomposite has good photocatalytic properties due to its anatase phase, existence of tetrahedral coordination of TiO2 in the SiO2 matrix and very large surface area. Furthermore, the synthesized anatase-SiO2 shows significant adsorption ability towards Congo Red CR azo dye in comparison with the pure commercial TiO2 which is known as Degussa, P25.

KEYWORDS

TiO2-SiO2, Nanocomposites, Sol-Gel Preparation, Photocatalyst, Congo Red

Cite this paper

A. Nilchi, S. Janitabar-Darzi and S. Rasouli-Garmarodi -Sol-Gel Preparation of Nanoscale TiO2-SiO2 Composite for Eliminating of Con Red Azo Dye,- Materials Sciences and Applications, Vol. 2 No. 5, 2011, pp. 476-480. doi: 10.4236-msa.2011.25064.





Author: Abdolreza Nilchi, Simin Janitabar-Darzi, Somayeh Rasouli-Garmarodi

Source: http://www.scirp.org/



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