Hexagonal-Nb2O5/Anatase-TiO2 mixtures and their applications in the removal of Methylene Blue dye under various conditions

Hexagonal-Nb2O5/Anatase-TiO2 mixtures and their applications in the removal of Methylene Blue dye under various conditions

Author Ferraz, Nathalia P. Autor UNIFESP Google Scholar
Marcos, Francielle C. F. Google Scholar
Nogueira, Andre E. Google Scholar
Martins, Alysson S. Google Scholar
Lanza, Marcos R. V. Google Scholar
Assaf, Elisabete M. Google Scholar
Asencios, Yvan J. O. Autor UNIFESP Google Scholar
Abstract To the best of our knowledge, catalysts based on mixtures of Hexagonal-Nb2O5/Anatase-TiO2 have not been well studied yet. In this sense, the aim of the present study was to synthesize, characterize and explore the catalytic activity of Hexagonal-Nb2O5/Anatase-TiO2 catalysts in the removal of Methylene Blue dye, MB (used as model molecule of organic pollutant in aqueous solution), under UV-light (253.7 nm), Visible-light (400-700 nm) and Visible-light (400-700 nm) plus H2O2. The influence of the Hexagonal-Nb2O5 on the activity of a commercial TiO2 (Rutile/Anatase) was evaluated. The catalysts were characterized by various techniques

XRD, H-2-TPR, BET, EDX, DRS and SEM. Our results show that the presence of Hexagonal-Nb2O5 hinders the Anatase-to-Rutile phase transformation of TiO2, sensitizes and enhances the photocatalytic activity of the commercial TiO2 under white-light. The best catalyst was the sample with 60 wt % of Nb2O5 (0.6NbTi sample), showing the highest removal values of MB in aqueous solutions under white-light and white-light plus H2O2. Additionally, the present paper shows a new route to obtain a single hexagonal phase of Nb2O5 using Niobium Ammoniacal Oxalate by a simple and economic route. (C) 2017 Elsevier B.V. All rights reserved.
Keywords Hexagonal-Nb2O5/Anatase-TiO2
Anatase-to-Rutile phase transformation
Sensitization
Methylene Blue dye
Removal
Photocatalytic activity
Language English
Sponsor Brazilian National Council for Scientific Development (CNPq)
Brazilian Metals and Mining Company (CBMM)
Sao Paulo Research Foundation (FAPESP)
Grant number FAPESP: 2014/24940-5
Date 2017
Published in Materials Chemistry And Physics. Lausanne, v. 198, p. 331-340, 2017.
ISSN 0254-0584 (Sherpa/Romeo, impact factor)
Publisher Elsevier Science Sa
Extent 331-340
Origin http://dx.doi.org/10.1016/j.matchemphys.2017.06.029
Access rights Closed access
Type Article
Web of Science ID WOS:000407408600042
URI http://repositorio.unifesp.br/handle/11600/51358

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