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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.)

An Understanding of the Photocatalytic Properties and Pollutant Degradation Mechanism of SrTiO3 Nanoparticles

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Author(s):
da Silva, Luis F. [1] ; Lopes, Osmando F. [2, 3] ; de Mendonca, Vagner R. [4] ; Carvalho, Kele T. G. [3] ; Longo, Elson [1] ; Ribeiro, Caue [3] ; Mastelaro, Valmor R. [5]
Total Authors: 7
Affiliation:
[1] Univ Estadual Paulista, Inst Quim, LIEC, Araraquara, SP - Brazil
[2] Univ Fed Sao Carlos UFSCar, Dept Quim, Sao Carlos, SP - Brazil
[3] EMBRAPA Instrumentacao, Sao Carlos, SP - Brazil
[4] Inst Fed Educ Ciencia & Tecnol Sao Paulo, Itapetininga, SP - Brazil
[5] Univ Sao Paulo, Inst Fis Sao Carlos, Sao Carlos, SP - Brazil
Total Affiliations: 5
Document type: Journal article
Source: Photochemistry and Photobiology; v. 92, n. 3, p. 371-378, MAY-JUN 2016.
Web of Science Citations: 10
Abstract

Strontium titanate nanoparticles have attracted much attention due to their physical and chemical properties, especially as photocatalysts under ultraviolet irradiation. In this paper, we analyze the effect of heating rate during the crystallization process of SrTiO3 nanoparticles in the degradation of organic pollutants. The relationship between structural, morphological and photocatalytic properties of the SrTiO3 nanoparticles was investigated using different techniques. Transmission electron microscopy and N-2 adsorption results show that particle size and surface properties are tuned by the heating rate of the SrTiO3 crystallization process. The SrTiO3 nanoparticles showed good photoactivity for the degradation of methylene blue, rhodamine B and methyl orange dyes, driven by a nonselective process. The SrTiO3 sample with the largest particle size exhibited higher photoactivity per unit area, independent of the molecule to be degraded. The results pointed out that the photodegradation of methylene blue dye catalyzed by SrTiO3 is caused by the action of valence band holes (direct pathway), and the indirect mechanism has a negligible effect, i.e. degradation by O-2(-center dot) and (OH)-O-center dot radicals attack. (AU)

FAPESP's process: 13/09573-3 - Synthesis and Characterization of the ZnO/SnO2 Heterostructures obtained by Hydrothermal Method: Gas Sensor Applications
Grantee:Luís Fernando da Silva
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 13/26366-1 - Development of heterostructured thin films based on BiVO4 for application in organic pollutants photodegradation
Grantee:Vagner Romito de Mendonça
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 15/12304-0 - Evaluation of the photocatalytic activity of g-C3N4/Nb2O5 heterojunctions in the abatement of pollutants in gas phase
Grantee:Kele Tatiane Gomes Carvalho
Support Opportunities: Scholarships in Brazil - Post-Doctoral
FAPESP's process: 13/13888-0 - Synthesis of BiVO4/bismuth oxides nano-heterostructures and evaluation of photocatalytic properties
Grantee:Osmando Ferreira Lopes
Support Opportunities: Scholarships in Brazil - Doctorate
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