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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.)

Titanate nanotubes produced from microwave-assisted hydrothermal synthesis: Photocatalytic and structural properties

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Manfroi, Daniela C. [1] ; dos Anjos, Ademir [2] ; Cavalheiro, Alberto A. [2] ; Perazolli, Leinig A. [1] ; Varela, Jose A. [1] ; Zaghete, Maria A. [1]
Total Authors: 6
[1] UNESP, Inst Quim, Ctr Multidisciplinar Desenvolvimento Mat Ceram, BR-14801907 Araraquara, SP - Brazil
[2] Ctr Pesquisa & Tecnol Recursos Nat CPTREN, BR-79950000 Navirai, MS - Brazil
Total Affiliations: 2
Document type: Journal article
Source: CERAMICS INTERNATIONAL; v. 40, n. 9, A, p. 14483-14491, NOV 2014.
Web of Science Citations: 23

Titanate nanotubes were successfully synthesized using the microwave-assisted hydrothermal method from commercial TiO2-anatase powder. Several samples were obtained at varying temperatures and time. Powder samples containing titanate nanotube (Na2Ti6O13) single phase were obtained at 130 degrees C for 4 h and 150 degrees C for 2 h, demonstrating the kinetics dependence of reaction temperature. Through XRD analysis and electron diffraction pattern, the nanotube structures were found to be composed of a short range ordering, thus giving rise to a broad XRD peak profile. The higher time and temperature (150 degrees C for 4 h) led to the formation of more organized structures. The nanotubes UV-vis spectra showed a band gap of 3.90 eV and a shoulder on the curve which led to another band gap value 3.25 eV. The photoluminescence spectrum emission peak presented a significant decrease, indicating the reduction of surface or structural defects of titanate nanotubes due to longer hydrothermal treatment duration. All structural, electronics and morphologics transformation led to an improvement on photocatalytic activities for nanotubes, especially the sample obtained at 150 degrees C for 1 h that rate of decolorization is 0.01879 min(-1), 2.25 times faster than TiO2-anatase (starting phase). (C) 2014 Elsevier Ltd and Techna Group S.r.l. All rights reserved. (AU)

FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
Grantee:Elson Longo da Silva
Support type: Research Grants - Research, Innovation and Dissemination Centers - RIDC