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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

A novel synthesis route of titanium dioxide with (NH4)(0.3)TiO1.1F2.1 as by-product

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Author(s):
de Moraes, Nicolas Perciani ; Carvalho, Thais ; Caetano Pinto da Silva, Maria Lucia ; Bastos Campos, Tiago Moreira ; Thim, Gilmar Patrocinio ; Rodrigues, Liana Alvares
Total Authors: 6
Document type: Journal article
Source: CERAMICS INTERNATIONAL; v. 43, n. 16, p. 13677-13682, NOV 2017.
Web of Science Citations: 2
Abstract

This work explores a new route for the synthesis of titanium dioxide using scraps and titanium chips, which are typically discarded as waste, as the precursor materials. The band-gap energy of the synthesised materials was determined using diffuse reflectance spectroscopy. The morphology, elemental analysis, crystallinity, and chemical structure of the synthesised materials were determined by scanning electron microscopy, energy dispersive spectroscopy, X-ray diffractometry, and infrared and Raman spectroscopies, respectively. The X-ray and Raman analyses confirmed the formation of titanium dioxide in its tetragonal (anatase) crystalline form after heat treatment (400 degrees C, 2 h). Moreover, a mixture of (NH4)(0,3)TiO1,1F2,1 and anatase TiO2 was obtained as a by-product. After heat treatment, this by-product was converted into fluorine-doped titanium dioxide, also in anatase crystalline form. The apparent crystallite size (L-c) of anhydrous titanium dioxide was found to be smaller than that of the calcined by-product. The diffuse reflectance spectroscopy analysis revealed that the calcined by-product has a significantly higher absorption capacity at higher wavelengths, as well as a lower band-gap energy value. The scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) analyses showed large particulates on which smaller particles are deposited and good dispersion of the elemental components. The anhydrous titanium dioxide sample presents a smaller particle size than the calcined by-product. (AU)

FAPESP's process: 15/08995-7 - Preparation, modification and catalytic evaluation of Nb2O5-based photocatalysts
Grantee:Liana Alvares Rodrigues
Support type: Regular Research Grants
FAPESP's process: 16/04244-0 - Preparation, modification and catalytic evaluation of TiO2-based photocatalysts
Grantee:Nicolas Perciani de Moraes
Support type: Scholarships in Brazil - Scientific Initiation