Crystallization of TiO2 xerogel (original) (raw)

Journal of Thermal Analysis and Calorimetry, 2020

Abstract

For utilization of TiO2 in advanced applications, TiO2 after thermal treatment has to be in crystalline phase of anatase, because it gives the desired (photocatalytic) properties to material. The work deals with the study of anatase crystallization in TiO2 xerogel (dried at 80 °C) which was prepared from sol in “titanium isopropoxide–isopropyl alcohol–nitric acid–distilled water” system. DTA/TG analysis at heating rates of 10 and 2 °C min−1 was used for study of processes which take place during the thermal treatment of xerogel. Besides assumed anatase crystallization, the processes connected with mass loss were observed, and therefore, the process of thermal treatment of xerogel was observed using high-temperature Raman spectroscopy and high-temperature X-ray diffraction. Based on the comparison of results of all analyses, it can be concluded that the anatase is formed from xerogel by sequent processes in the temperature range of 280–400 °C—the first process represents the decomposition of xerogel and subsequent formation of amorphous TiO2 and the second process represents the formation of crystalline anatase, respectively.

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