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Open AccessArticle

Effect of pH on the Formation of Amorphous TiO2 Complexes and TiO2 Anatase during the Pyrolysis of an Aqueous TiCl4 Solution

1
School of Engineering Physics, Hanoi University of Science and Technology, No. 1, Daicoviet, Hanoi 10000, Vietnam
2
Department of Chemistry, Hanoi Pedagogical University 2, 32 Nguyen Van Linh, Phuc Yen, Vinh Phuc 15000, Vietnam
3
Faculty of Natural Sciences, Electric Power University, 235 Hoang Quoc Viet, Hanoi 10000, Vietnam
*
Author to whom correspondence should be addressed.
Catalysts 2020, 10(10), 1187; https://doi.org/10.3390/catal10101187
Received: 6 September 2020 / Revised: 9 October 2020 / Accepted: 12 October 2020 / Published: 15 October 2020
The titanium dioxide (TiO2) nanostructures resulted by the pyrolysis of titanium tetrachloride (TiCl4) at a low temperature of 80 °C were found to be a mixture of amorphous TiO2 complexes and anatase nanostructures, whose ratio depends on the pH of the pyrolysis medium. At a low pH level, the resulting TiO2 nanostructures are predominantly anatase and gradually shift to amorphous TiO2 complexes as the pH level increases. Moreover, the amorphous TiO2 complexes can convert back to anatase nanostructures by a post-heating treatment, and can then transform to rutile with elevating temperature. Amongst the TiO2 nanostructures recovered from the amorphous TiO2 complexes, anatase appears to be the most effective photocatalyst in the decomposition of methylene blue. View Full-Text
Keywords: photocatalyst; amorphous TiO2 complexes; TiO2; anatase nanostructures photocatalyst; amorphous TiO2 complexes; TiO2; anatase nanostructures
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Duong Ngoc, H.; Mai Xuan, D.; Mai Van, T. Effect of pH on the Formation of Amorphous TiO2 Complexes and TiO2 Anatase during the Pyrolysis of an Aqueous TiCl4 Solution. Catalysts 2020, 10, 1187.

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