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Sol-gel synthesis is a largely used method for obtaining materials with catalytic applications. The photocatalytic activity of TiO2 in form of anatase is higher compared to rutile TiO2, but anatase is unstable while rutile is thermodynamically stable. The thermal stability and even photoactivity can be improved by addition of SiO2 to TiO2 anatase. TiO2-SiO2 samples studied in this work were prepared by classical sol-gel methods and long time maturated at room temperature. The samples obtained after 6 months aging contain nanostructured anatase self-assembled in amorphous silica. Heat treatments applied up to 1000oC do not alter the anatase crystalline phase. The structural changes as function of treatment temperature both inside and on the outermost surface layer of the heat treated titanosilicate particles were investigated by XRD, FTIR and XPS..
Titanosilicate, Anatase, XRD, FTIR, XPS.
M. TODEA, M. POP-MURESAN, S. SIMON, D. ENIU, Thermal stability of anatase phase nanostructured in long time maturated sol-gel derived TiO2-SiO2 composite, Optoelectronics and Advanced Materials - Rapid Communications, 12, 5-6, May-June 2018, pp.342-346 (2018).
Submitted at: March 30, 2018
Accepted at: June 7, 2018