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

Mai Xuan Dung; Tuan Mai Van; Huyen Duong Ngoc

doi:10.20944/preprints202008.0037.v1

Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

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)

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 that depends on the pH of the pyrolysis medium. Anatase nanostructure is predominant at low pH level and gradually converts to amorphous TiO₂ complexes with increasing pH level. By means of heat treatment, the TiO₂ nanostructures can be recovered from amorphous TiO₂ complexes. Amongst of the TiO₂ nanostructure recovered from amorphous TiO₂ complexes, the anatase nanostructure shows to be the strongest photocatalyst in decomposition of methylene blue.

photocatalyst; amorphous TiO2 complexes; TiO2; anatase nanostructure

MATERIALS SCIENCE, General Materials Science

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

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