Anatase-rutile-brookite: Structural and photocatalytic properties of TiO₂ modified with different boron concentrations

Author(s):Show less -

Moreira, Ailton J. ; de Araujo, Kelvin C. ; Marques, Gleison N. ; Nobrega, Eryka T. D. ; Santos, Hugo L. S. ; Mascaro, Lucia H. ; Onofre, Yina J. ; Galeti, Helder V. A. ; Gobato, Yara Galvao ; Mastelaro, Valmor R. ; Freschi, Gian P. G. ; Godoy, Marcio P. F. ; Pereira, Ernesto C.

• Document type: Journal article
• Source: Materials Research Bulletin; v. 179, p. 13-pg., 2024-06-26.

Abstract

This study prepared titanium dioxide nanostructures modified with different boron (B-modified TiO2) concentrations. The percentage of the anatase was > 98 % and the rutile was < 1.1 % for pure samples or low boron concentrations. The brookite grew from 0.5 to 1.79 % with increasing boron concentration. The nanostructures with a diameter < 25 nm and Egap < 3.07 eV efficiently degraded 100 % of RhB up to 120 min or 45 min using UV-A or UV-C light, respectively. The most efficient material was used for the fluoxetine (FLX) photocatalysis. 3D spectrofluorimetry coupled with parallel factor analysis (PARAFAC) was applied to quantify FLX and the transformation product (TP). Therefore, LC-MS-Q-TOF analyses identified other TP and proposed a degradation mechanism. In general, our results show that modifying TiO2 with a low boron concentration is an excellent way to improve the photoactivity of this material for the degradation of organic contaminants. (AU)

• FAPESP's process: 22/06219-3 - Developing and disseminating new technologies for environmental remediation of emerging contaminants
• Grantee: Ailton Jose Moreira
• Support Opportunities: Generation Project Research Grant
• FAPESP's process: 13/07296-2 - CDMF - Center for the Development of Functional Materials
• Grantee: Elson Longo da Silva
• Support Opportunities: Research Grants - Research, Innovation and Dissemination Centers - RIDC
• FAPESP's process: 22/05254-0 - Carbon dioxide electrochemical reduction to polymeric precursors
• Grantee: Eryka Thamyris Damascena Nobrega Cavalcanti
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 19/26860-2 - Synthesis and modification of CuO/Ga2O4 and Cu2O/Ga2O4 nanostructured films applied in H2 production from water photoelectrochemical reduction of water
• Grantee: Hugo Leandro Sousa dos Santos
• Support Opportunities: Scholarships in Brazil - Doctorate
• FAPESP's process: 17/11986-5 - Generation and storage of New Energy: bringing technological development for the country
• Grantee: Ana Flávia Nogueira
• Support Opportunities: Research Grants - Research Centers in Engineering Program