Preprint Article Version 2 Preserved in Portico This version is not peer-reviewed

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

Version 1 : Received: 31 July 2020 / Approved: 2 August 2020 / Online: 2 August 2020 (15:11:36 CEST)
Version 2 : Received: 6 September 2020 / Approved: 7 September 2020 / Online: 7 September 2020 (04:04:35 CEST)

How to cite: Tuan, M.V.; Xuan Dung, M.; Huyen, D.N. Effect of pH on the Formation of Amorphous TiO2 Complexes and TiO2 Anatase during Pyrolysis of Aqueous TiCl4 Solution. Preprints 2020, 2020080037 (doi: 10.20944/preprints202008.0037.v2). Tuan, M.V.; Xuan Dung, M.; Huyen, D.N. Effect of pH on the Formation of Amorphous TiO2 Complexes and TiO2 Anatase during Pyrolysis of Aqueous TiCl4 Solution. Preprints 2020, 2020080037 (doi: 10.20944/preprints202008.0037.v2).

Abstract

The TiO2 nanostructures resulted by pyrolysis of TiCl4 at low temperature of 80 oC are found to be a mixture of amorphous TiO2 complexes and anatase nanostructure whose ratio depends on the pH of the pyrolysis medium. At low pH level, the resulting TiO2 nanostructure is predominant anatase and gradually shifts to the amorphous TiO2 complexes with pH level increasing. By means of heat treatment, the amorphous TiO2 complexes can be converted back to the anatase nanostructure and then transform to rutile with the elevating temperature. Amongst of the TiO2 nanostructure recovered from amorphous TiO2 complexes, the anatase shows to be the most effective photocatalyst in decomposition of methylene blue.

Subject Areas

photocatalyst; amorphous TiO2 complexes; TiO2; anatase nanostructure

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